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class="iconfont icon-global"></span></div> <div class="pages__Wrapper-sc-6wjysl-0 dvBrln"> <div class="pages__TopBg-sc-6wjysl-2 hsxklq"> <div class="content"> <h1>Gearbox synchro symptoms. For the past month I have had to do without 4th .</h1> <span class="pages__DownloadBtn-sc-6wjysl-1 hCfioa">Gearbox synchro symptoms. Large flywheel does not fit on 3-main engine. Feb 12, 2023 · Here’s a more detailed list of the signs of a bad or failing automatic transmission to look for: 1. May 23, 2012 · The pushrod connecting the peddle to the clutch master should have about 2mm or 1/16" of free play. Car stuck in one gear. The Synchromes Apr 8, 2020 · Difficulty Shifting Gears. Feb 12, 2021 · Synchromesh transmissions are a further refined version of the constant mesh system, although less common. If so, then the following could be the reasons. The most common problem with the ZF6 is that the third gear synchro can fail, causing the transmission to grind when shifting into third gear. Oct 6, 2007 · IF 1st gear is grinding and the rest of the gears are working correctly, likely that 1st gear synchro is worn. Mar 3, 2015 · Every time I change into or out of 3rd gear too fast, the gear grinds. If you do, your transmission will simply never wear out. The shifter linkage can make positive shifts hard to execute, and the result is grinding and noise from the transmission as it tries to get into gear and stay there. If you don't plan on fixing it try double clutching going into third gear. Click for larger image. Leaking Fluid. From my research, I believe it is a problem with the 3rd gear synchro, and not A synchromesh gearbox does not require the driver to double clutch as the truck gearbox has synchro rings which match the road speed and the engine revs which allows the gear to be selected. This is the most common sign of an aging transmission. Synchro gears are necessary in manual transmissions to synchronize the rotation of the gears, preventing grinding and damage to the transmission. In some countries Jun 19, 2006 · Replaced the third gear synchro. With bushings, thumping, bumping, squealing, and whirring sounds are most common. Sep 30, 2021 · Battered gear teeth. If you decide to replace the synchronizer rings, you can expect to pay from $1500 to $2000 for parts and labor. The second part of the assembly is a ring, with teeth that match those on the side of the gear wheel. Oil leakage. To my surprise, he had to add between 2 and a half & three pints to bring it up to full level. Here are some symptoms that can indicate a worn-out transmission, each one of which we discuss below. If you wear out the synchros, you can potentially ruin your gears. Other than that check that the master hasn't gone dry. 1970 Trafalgar Blue Traveller. The clutch will either grind when you try to shift gears or you won’t be able to get the transmission into gear at all. To prevent it, make sure you have good tranny fluid and that yours shifts are fast and smooth. 3. Jan 29, 2006 · Got the gearbox replaced last year for a dying 2nd gear synchro. A synchromesh gearbox is a remarkable piece of engineering that has revolutionized the automotive world. Jul 10, 2016 · Sounds like the 1st gear synchro to me. 5. If your 2nd gear from the other transmission is a double synchro unit (MD748576 = FWD 1995. 4 with all synchro and ‘type ‘A’ compact overdrive. Save time and money by not burning them up and making sure the clutch is not dragging. Generally, these issues don't show up suddenly. and power shifting or shifting too quickly can cause this issue, if you force the car into the gear before the syncros are going fast enough you will absolutely destroy the gear set. Feb 16, 2022 · The synchromesh gearbox is a type of manual transmission system in which transmission changes occur between gears rotating at the same speed. The worn synchro ring eventually split and the fragments proceeded to destroy the transmission. Paul Cangialosi explains the cause and fix for this issue. 1. It could be the synchros, but before you assume it is change your gearbox oil. May 24, 2005 · When you lose a synchro on a T-5, 99. Shavings from drum harm both to filter and details in the gearbox, and the electrician — mechatronics, to solenoid coils and sensors. ( Mine does ) Gentle continued pressure should make the car creep forward as the synchro rings transmit just enough power, like a slipping clutch. This noise usually occurs when the gears are not properly synchronized, resulting in an unpleasant sound. I had the box stripped and a new ( and expensive) 2nd gear synchro ring replaced. Difficult matings: 3-main engine to 4-synchro gearbox, use post-'67 engine plate and machine out the center hole to clear the mounting flange on the crankshaft. Transmission jumps out of gear (into neutral) Difficulty shifting gears. I have had the clutch's oil + the gearbox oil changed and it completely cured it! Now gear shifts are so smooth like in a new car! I guess Type-R's need gearbox oil changes more frequently. Oct 16, 2010 · Reverse is a non syncro gear so it is the most likely to grind if the gears are still spinning due to the clutch not disengaging. #5 · Aug 11, 2011. If that's what you're experiencing, you can avoid most of the grind by double clutching --> clutch in, shift to neutral, clutch out, blip the throttle to approximately where your tach will fall on the next gear, clutch in, shift to next gear, clutch out, drive on. Remote control shifting mechanism out of adjustment. In this type of gearbox, the gears on the layshaft are fixed to it and the gears on the main shaft can either roll freely when disengaged or be locked on the layout shaft when engaged. Putting the clutch in disengages the engine from the input shaft, so waiting a moment gives it time to come to a stop. Essentially, a synchro simply matches the speed and position of the gear you are shifting out of, and the gear you are shifting into, by use of friction as soon as you depress the clutch pedal. Worn or failing synchronizer. When the pressure plate releases load on the clutch, the trans will slide right in place The synchro’s in a truck's gearbox play an important role in ensuring smooth and efficient gear changes. We would like to show you a description here but the site won’t allow us. Mar 7, 2013 · It's quite tricky to get the hang of though; as you change gear, you have to first dip the clutch to put it in neutral, then blip the throttle to just the right engine speed, clutch down again and into the next lower gear. When I do that as I am pushing the shifter into 1st I hear the synchro really wind up :confused: I don't recall that before. A clutch that is not open all the way making the synchro work extra hard but never accomplishing it's job, thus you can't go into gear. Loose cover bolts. 2nd to 3rd can be smooth other times a bit notchy (characteristic of the car). Jun 2, 2017 · Instead, install the clutch linkage and have a friend depress the clutch pedal while you push on the trans. If it was the clutch it would do this in all gears. Start by holding the mainshaft in a bench vice, front end up. […] The synchromesh mechanism itself comprises two parts. And in reality that isn't a clutch issue it's the actuation of the pressure plate. To use the guideline, 1) Locate the transmission problem in the boxes below. You may also hear this noise when shifting gears or accelerating. Worn or damaged shafts. This usually begins with the idea that installing a performance clutch will improve the vehicle performance. If you decide not have it fixed right away, make sure you mention it to the dealer and they record that you are having the issue. As a result, the synchronizer and other transmission parts may sustain damage. The biggest advantage of a synchromesh gearbox is it can shift gears more smoothly while generating less noise and vibration. Pretty much exactly what you're describing. Depending on the Nov 5, 2013 · Filling to 2. ~~~~ Mar 21, 2014 · The gear box had a 3rd/4th synchro spring fail about six months ago. Worn or damaged gears. Damaged Gear Teeth. Symptoms are different, in that it doesn't grind and try to pop out if I downshift to 2nd. Nov 1, 2022 · The ZF6 transmission is a six-speed manual transmission that was introduced in 2001. Â The symptoms were immediately recognisable, having suffered the same failure in 2004, that resulting gearbox rebuild triggering the rebuild of the whole vehicle. Synchro’s are small devices that help to match the speed of the gears and the engine, allowing for seamless shifting between gears. If a synchro gear fails, it can lead to difficulty shifting, grinding gears, and eventually, complete transmission failure. As in most of the "basket case" purchases, the devil is in the details. Many of the trucks doing local deliveries tend to use this type of gearbox as it is easier for the driver to operate and allows companies more choice when Dec 2, 2006 · At tickover on a level road. The ring can rotate about 0. I have only been complaining about these "normal characteristics" since 3,000 miles. Dec 25, 2022 · Here are a few symptoms of bad synchros: Increased shifter resistance - You've probably realized that whenever you were shifting the gears, you felt that the gear lever almost pulled itself into the gear that you wanted to select. ago. Small flywheel does not work with later engine plate. For instance, a cone on one gear will fit into a cone-shaped depression on the collar. It is common when a clutch is dragging at high RPM to burn up the 3rd gear synchro blocker ring. Sounds Mar 8, 2010 · The symptoms you present are either: 1. Synchro damage due to a dragging clutch will not be covered under our warranty. If the clutch is failing, you will also notice a difficulty shifting gears at all. It splits the dog clutch in two – a gear fixed to the drive shaft called the synchronizer hub, and a Mar 11, 2021 · The synchromesh on gears 3, 4, 5 and 6 are all of the same design and same part number. In this case, the cost to repair the synchro gear can add up quickly. NY. A worn clutch has less than nothing to do with gears grinding. . Lift off the 4th gear synchro ring, the 3-4 sliding hub assembly, and the 3rd gear synchro ring, then exposing what is seen in the picture here. I think the Hanlon tape shows it pretty well, my Mustang manual is OK, and the T5 PDF only makes sense when you do it. Strange and excessive noises, such as grinding or squeaking, can indicate issues with the gearbox. Mostly #2 never happens so we're pointing you towards #1 which is quite common on these cars. If you don't get it right, you get a sickening crunch of the gears! Maurice, Kent. It then was unable to work properly and 3rd gear started to grind. Location. You can do it quickly but it comes with practice. One of the symptoms is hard or noisy gear shifting. There is an "improved" steel synchro ring available for the earlier gearboxes, but it requires also changing the mating 2nd gear. They both use the same intermediate shaft, hub and slider, springs/keys, etc. On one side of the synchro gear there is a narrow row of small male teeth that will mate with a female spline in the sliding hub. Sep 18, 2020 · Unusual sounds can indicate bushing problems as well. Like. So try that and see if it helps. You can drive this way with stock synchros. Later model MGB 4-synchro units will also have synchronized 1st gear. When going from 1st into 2nd I get a slight crunch occasionally. Â This time around, it happened on the way to work, and I had to drive Sep 11, 2022 · The typical manual transmission synchronizer problems include; 1. It divides the dog clutch into two parts, a gear attached to the drive shaft called the synchromesh hub Send Inquiry. Over time, these synchro’s can wear out, leading to a range of issues with the gearbox. #24 · Nov 18, 2014. Synchro that can no longer create enough friction on the cone to sync. Each manufacturer's synchro is slightly different than the others, but the basic idea is the same. Jul 3, 2023 · Dutch firm DAF was the first use a continuously variable transmission in its 600. Jun 10, 2018 · 2nd 3-2 gear synchro when Jump to Latest Follow 5K views 4 replies 4 participants last post by husker boxster Jun 18, 2018 Jul 9, 2011 · Thanked 114 Times in 79 Posts. It doesn't happen if I keep the clutch depressed and take longer shifting the shifter. 3rd to 4th There is another synchronizer just aft of the input gear that works directly between the input shaft and the output shaft for direct drive 4th gear. Oct 8, 2006 · 1st & 2nd synchro hub is the part that is factory pressed on the shaft - not revemoveable. Damaged or improperly installed gaskets or oil seals. The most common symptoms include: Excessive Noise. If these rings are worn or damaged, they may not be able to synchronize the gears properly, resulting in delays. It tends to get progressively worse. The purpose of a synchromesh gearbox is to synchronize the rotational speeds of the gears before engaging them. Â This time around, it happened on the way to work, and I had to drive Jul 18, 2014 · kodnevmisha. Hard and/or noisy gear shifting: Gearbox Problems. When a trans blo. I am in my neighborhood in 2nd gear pulling up to my driveway (doing about 15 to 20mph) as I am braking I put it in 1st gear. Mar 18, 2024 · Symptoms of Gearbox Failure. 32 quarts as of at least 05/2016! Here is the fluid recommended as an OE replacement: AMSOIL Manual Synchromesh Transmission Fluid 5W-30. Sep 12, 2011 · Limitations of synchromesh gearboxes in high-performance applications include slow upshifting at very high engine speeds—e. EDIT: GM has officially updated the transmission fill specification to 2. 2) Hover over the box to see the possible problem and take note of the numbers next to the possible cause. After about a month I was finally able to get the oil changed back to Subaru's specs. Feb 14, 2024 · From bad first gear synchro symptoms to more complex issues, these tales from the trenches offer a wealth of knowledge for all car owners. I'm not hearing any weird noises (screeching, whining, etc) while shifting except an occasional grind (2nd gear). Whatever is happening is not good for the synchro into second, but it may still be working fine. To prolong the life of syncros don't slam gears; feel your stick shift when going into gear you'll get a moment of resistance then a click feeling as it goes in. Worn bearings. Slipping Gears. If low or empty you have to ask yourself where it went. Nov 15, 2017 · I own a late 1967 Mark 2 3. • 8 yr. Looks like it finally gave out. It was a remarkable evolution in manual transmissions because the synchronizer did away with the need for motorists to perform double-clutching – releasing and re-engaging the clutch twice whenever changing gears – a requirement to operate a May 15, 2015 · Dark Gray Metallic. I can't imagine the cost in labor. This is how to indicate if your manual transmission has bad synchros Dec 28, 2011 · Yes, the gear is interchangable. Jul 1, 2005 · The mechanics of a synchronized shift are relatively simple. I went to visit my mechanic today for and oil change. Mar 21, 2014 · The gear box had a 3rd/4th synchro spring fail about six months ago. Odd Noises When Shifting. Budget on a thousand $ at most with new oil and parts. How it improves the system is by adding another stage to the process of connecting the gears to the drive shaft through the dog clutch. It was better but not great. 9% of the time you destroy the gear themselves. So any Synchro job on a T-5 Requires a Slider (1st and 2nd OR 3rd and 4th), will require the brass synchro rings, will require the Gear thats grinding, and possibly Jan 11, 2024 · 3. Same symptoms you are experiencing. When I upshift to 2nd and 3rd, I get a griding most of the time and it's hard to get it into gear. Aug 10, 2011 · 2642 posts · Joined 2002. The partition with cleaning is recommended as soon as magnets of the pan show that hedgehogs of shaving have grown to several millimeters. This can indicate a multitude of problems with any part of the clutch or its attachments. Jan 8, 2003 · Example. One of the most common symptoms of a gearbox problem in your Volvo is a whining or clunking noise. The most common sources of manual transmission noises include: Low fluid level. Take, for instance, a 2005 sedan that, after a decade on the roads, started manifesting a peculiar resistance when shifting from first to second gear. Ignoring this sound can lead to severe damage to Apr 18, 2004 · Alright, so I've read through a couple release bearing, throwout bearing, and synchro threads. This indicates a problem with the shift linkage, and that problem could be a worn bushing. Many new manual transmissions are shipped today with a common problem of stuck synchro rings. Fortunately, I am an expert. Then again, transmission noise can appear Recognizing the symptoms of a faulty gearbox is the first step towards troubleshooting the problem. There were more than one input shafts, more than one main shafts, several types of gears etc. Instead, it simply feels like there're two "steps" or "notches" in each gear, and if I stop at the first, it'll pop out. So you have the inserts, retainer springs, detent ball/ spring (maybe), as well as the 1/2nd synchro sleeve - plus second speed gear. The nut and the 5th synchro can both be rectified without gearbox removal or major dismantling. There is a market for the three synchro overdrive gearbox, and they are sought after by folks interested in the correct gearbox for Mk1 B's. The driver selects a gear to be engaged using the shift lever, which in turn moves a shift fork connected to the synchronizer sliding sleeve. Oil leaks from the gearbox due to the following reason: Too high oil level in case. 5 quarts total also helps with the heat issue, and provides better lubrication of the 5-6 gear shaft. Oct 3, 2019 · Toyota did have an issue with the 2nd gear synchro's during a certain period, I had one with only 80K miles (a 95) and the 3rd/2nd downchange always required a double de-clutch to facilitate a clean change. Check the synchro-cone wear – If worn out, then change synchro-cone and gear. Jun 12, 2016 · This video explains the operation of a typical manual transmission, detailing gear changes and synchromesh (blocker/baulk ring) operation. 1: the TB/TC gearbox internals. Tags. The manual transmission’s synchronized gearbox is what helps you smoothly lock gears into place. It is possible to do the 2nd gear synchro only at lowish cost, about £250-350 . Mar 4, 2015 · Its not undrivable but could be better. #5 · Mar 20, 2012. Next, with the engine running let out the clutch again in neutral, and then press it in and try to engage 1st. If the transmission is ruined due to a dragging clutch it will have to be rebuilt all over again. what is Synchromesh gearbox ? A synchromesh gearbox, also known as a synchronized gearbox, is a type of manual transmission commonly used in automobiles. Oct 21, 2022 · The symptoms may include difficulty shifting gears, grinding sounds when shifting, or the transmission slipping out of gear. Transmission oil links can be from a wide Dec 6, 2002 · You can feel this contact, you maintain some light pressure and in a fraction of a second, the ring will grab the gear and the shifter will then move and complete its travel without further loading thru the fingers. 33 posts · Joined 2007. As gear teeth deteriorate over time, they become less able to mesh correctly, which causes the gears to grate against one another. these 6 speeds are pretty much the same 6 speed in the legacy GT from what i have read. 08-1999, MD748577 = AWD - 1995. 9,000 rpm—and slow downshifting, as well as the need to fully use May 23, 2011 · These components will handle more abuse without breaking, but in the end the synchronizers and speed gears will die of torque induced fatigue. If it's empty you will have to bleed the system of any trapped air. Sep 6, 2007 · John Twist explains the function and evolution of the three-synchro gearboxes fitted to the MG models 1955 → 1967. 2nd gear is really bad because when I shift I get this awful vibration in the shifter and it vibrates my entire arm. Thats a good shift. On average, it can cost between $500 and $1000 for labor costs alone. Believe it or not it DOES get old and need to be changed sometimes. All changing the fluid is going to do is get junk and worn syncro material out of the transmission, and get fresh clean fluid in there. « Help wrx 02 baterry problem and engine wont start up problem with flat spots !! Oct 1, 2007 · The synchro ring (blocking ring) has external teeth that match the inner splines of the synchro slider and the external engagement teeth on the speed gear. It is designed to make shifting gears smoother and easier for the driver. Apr 16, 2023 · The cost of replacing a manual transmission synchronizer will vary greatly depending on the make and model of the vehicle, as well as any additional parts that may need to be replaced. This is common knowlage. Improper clutch adjustment is the #1 cause for synchro failure in the 3S 5-6 speed trans. Jun 8, 2016 · This video explains the operation of a synchromesh unit in a typical manual transmission, detailing synchromesh (blocker/baulk ring) operation. 2. It fixed the problem, for about 3 days. Another point of early transmission failure is the wrong choice of clutch for the application. You might hear / feel a slight bump as the slack in the transmission is taken up. The Troubleshooter’s Guideline Chart is used to locate and correct transmission problems. Syncro has evolved to develop the Evocase SS range of single speed transfer cases. A synchromesh transmission system makes shifting smoother by providing a clutch between the gears. The clutch is dragging. When the synchros are in good operating condition, the transmission can be shifted quickly and smoothly with no grinding, double-clutching, or RPM Dec 10, 2018 · Volkswagen presents a world-wide technical innovation: the sporty and economical direct-shifting 6-speed automatic gearbox "DSG”. They develop over time as the result of poor maintenance, abuse, or high mileage. This article focuses on how a synchromesh gearbox works and the advantages it offers, its application, and the installation process. It has a central hub that is located in narrow splines cut into the mainshaft of the gearbox which allows the hub to both turn with and slide along the mainshaft. Without seeing the parts you can never be sure, but there are some very simple reasons why a manual transmission won't synchronise:-. Slipping gears occur when the gears in the gearbox fail to engage correctly, leading to a loss of power or acceleration. Sep 1, 2023 · Some common causes include: Worn or damaged synchronizer rings: The synchronizer rings are responsible for matching the speeds of the gears during shifting. Dec 28, 2023 · 4,528 Posts. A synchronizer, or "synchro," lets the collar and gear synchronize their speeds while they're already in contact but before the dog teeth engage. Apr 14, 2016. The use of “dog teeth” to engage the various gear ratios offers a more robust way than trying to mesh actual gears, as all the “dog teeth” are engaged simultaneously. For the past month I have had to do without 4th . Additionally, if the part itself needs to be replaced then this can add significantly more Mar 16, 2010 · 40,503. Oct 16, 2020 · 1. If you notice a pool of oil beneath the gearbox, it’s likely that it has a leak Synchromesh transmissions are a further refined version of the constant mesh system, although less common. The difference between a non-synchromesh and a synchromesh gearbox is that the latter is more refined than the former. shifting at any speed would require that you match speeds to prevent grinding. The original synchros are a good design and can withstand a lot of abuse, but once a clutch starts to drag and the driver starts to force the trans into gear, the synchro rings will be badly damaged in short time. In addition I like to downshift while driving towards a red light. Two choices 1) put it into some other gear prior to shifting, or wait to make sure the shafts have come to a complete stop before shifting into 1st. There are a wide range of noises and signs to be aware of when you’re heading towards the end of your gearbox – here’s a few of the most common to keep your eyes and ears open to: Issue Selecting Gears – Quite an obvious sign that you’re having gearbox trouble is when you begin to struggle changing or Clean and inspect each piece closely. 5th gear isn't too far behind, it grinds about 85% of the time colder weather defiantly increases symptoms for 5th. Synchros in the gearbox; If it's a fairly new clutch, and you are an experienced driver that treats your clutch well; It shouldn't be wearing that fast. gear. The car had been driving fine, and when I engage the May 24, 2004 · Welcome to the North American Subaru Impreza Owners Club: Friday December 22, 2023 Mar 20, 2012 · 498 posts · Joined 2010. cmiovino. all of the classic symptoms of a blown synchro: grinds with hard shifts, hard to get into gear Mar 2, 2005 · ^^ it'll feel very notchy when you shift into that respective gear, it may even grind depending on how fast you're shifting. Jan 28, 2016 · 10,200 miles, 6th gear grinds ever shift. May 11, 2006 · My experience was no different. 5-main engine to 4-synchro gearbox, use engine plate from post '68 MGB. Aug 1, 2021 · Fourth gear is a direct drive through the engagement of “dog teeth” and first is a “crash” meshing of spur gears. You have synchro rings inside the transmission that are essentially mini clutches made of brass in between your gears in the gearbox. With flexibility and outright strength at the forefront of the Evocase's design you can be sure thats its the strongest solution for you. When you destroy the synchro on the gear (which is the grinding sound), the slider also eats it. We would recommend changing all four of the old design of synchro if the transmission is removed to prevent costly repairs at a later date. The Fix - Proper Clutch Adjustment . Symptoms of a dragging clutch: The mainshaft assembly must be substantially disassembled to replace bronze bushings or the 2nd gear synchronizer ring. In the pic, this ring wore down so badly that it bottomed out on the gear. Fully custom, all billet, super strong transfer cases dedicated to off-road racing. With a 2007 FN2 I have also had the well known 3rd gear issue. Common issue #3 - Synchro Ring Wear . Car that can't get into gear. Designed by Hub Van Doorne, this system works using two conical drums with a belt between them. Other than that it isn't going to help. Your symptoms sound exactly like a synchro going out. If it goes into reverse immediately without grinding then the clutch is disengaging properly. fix, gearbox, problem, replace, synchro. While the car was up on the lift I asked him to check the oil level of the gearbox. This especially dynamic form of power transmission with integrated dual clutch will be used for the first time in the Golf R32 in the first quarter of next year. This part has thus superseded and a new design of synchro replaces this in order to prevent the issue happening again. every gear worked flawlessly, except 4th. The mechanism ensures smooth and noise-free gear transition, enhancing the overall driving experience. Odd sounds (whirring, squealing, bumping, or thumping) Grinding noise. Fig. Time to check for leaks in the system. The first symptom would be grinding gears. Evocase Single Speed Transfer Case. Feb 20, 2008 · It's like their is a wall blocking me from going into gear. 250 inch side to side and, during the initial movement of the slider, blocks the slider from engaging the speed gear until the shaft speeds match. Cracked case or cover. The grinding is 1st gear crunching on the input shaft without a synchro mating correctly while the input shaft is still turning. g. 07-1999 double synchro 2nd gear), then use it along with MD745896 double synchro. #10. This is particularly pertinent for 2nd gear, which gets more use and abuse than the others. As the gears shift, you hear lots of banging and clunking noises, which you know aren’t normal. ’ Here is my question. Insufficient lubricant, improper grade, or quality of gear oil. So that seems to throw the "release bearing problem" out the window. Â The symptoms then were the complete jamming of the synchro unit, locking out 3rd and 4th. The late model MGB with 4-synchro gearbox uses steel synchro rings, which last a LOT longer before wearing out. . Whining or Clunking Noise. But if you do that, you run the risk (as I found out) of other issues soon after. Nov 21, 2018 · the only way a clutch issue would have something to do with grinding would be if you weren't disengaging your clutch. Press the gearlever gently into gear, not fully, and without dipping the clutch. I can certainly say it's not the BRZ's transmission. There are several reasons why a gearbox may start slipping gears, including a worn-out clutch, low gearbox oil levels, or a damaged shift linkage. As the sleeve moves toward the speed gear, the keys move the synchronizer ring into contact with the cone of the speed gear. It is often considered to be one of the best transmissions ever made, but it has also been known to have some issues. Transmission DL501 (0B5) Problems. Finally, transmission fluid leaks can indicate a problem with the bushing. I am making sure the clutch is fully depressed, and it doesn't seem to change too much dependent on the rpms. 4000 miles on and 3rd gear is sometimes graunching and sticky going in & out. 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