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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 07-25-2009, 12:51 AM   #1
camarogolfguy
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Cool transmission clunk

I have a 2ss rs 6m. It has about 500 miles on it. To my knowledge I am not one of those with the transmission failure problem. During normal driving, I hear an audible clunk when shifting in lower gears. If I let the clutch out slowly, I can ease it into gear without the clunk. I don't hop on it - just normal shifting.

I have had several mt over the years, but this is the first time I recall ever encountering this kind of issue.

Is this normal? Should I have the dealer look at it?
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Old 07-25-2009, 12:55 AM   #2
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You're probably causing the sound by the speed you release the clutch. Try releasing it a bit slower after it hooks up with the 1st or 2nd gear... Mine makes no such sound btw so if yours still does at any speed you release the clutch at while giving gas, you should take it in to get checked.
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Old 07-25-2009, 12:57 AM   #3
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Well from your description it sounds like you're lugging the car a bit when shifting (which actually is normal since these cars are designed to be skip shifted and lugged in the next gear). If you take the revs up a little higher you'll notice that the clunk goes away.

The clunk is the slack in the driveline. Because of the IRS, you now have 2 extra U joints that will "slack" when you press the clutch in to shift and then when you begin to let the clutch back out, that "slack" is drawn back up quickly. It's very normal for IRS cars.

But if you're concerned, by all means, take the car into the dealer and have her looked at.

And you havent been driving your car hard enough to encounter the "failure" problem yet. Rev it to 5k and dump the clutch (just kidding, dont do that during break in!) and you'll find out if your tranny is one of the broken ones!
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Old 07-25-2009, 01:05 AM   #4
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Excuse my igorance, Lugging?

Also, I have noticed the car asking me to go from 1st to 4th at a slow acceleration. I am aware this a GM thing. My brother's 03 Vette also had this feature. I have been going into 2nd anyhow (it fights me a bit, but will make the shift into 2nd). It just doesn't make sense to skip the two gears when the rpm's can't be much more than 1200 or so at the point it wants me to go directly into 4th. If I don't skip shift, is this going to cause a problem?
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Old 07-25-2009, 03:14 AM   #5
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Quote:
Originally Posted by camarogolfguy View Post
Excuse my igorance, Lugging?

Also, I have noticed the car asking me to go from 1st to 4th at a slow acceleration. I am aware this a GM thing. My brother's 03 Vette also had this feature. I have been going into 2nd anyhow (it fights me a bit, but will make the shift into 2nd). It just doesn't make sense to skip the two gears when the rpm's can't be much more than 1200 or so at the point it wants me to go directly into 4th. If I don't skip shift, is this going to cause a problem?
DON'T FORCE IT TO ANOTHER GEAR if it wants you to go to 4th. Just speed up more or coast with the clutch in until the skip-shift message goes away before shifting into a different gear.
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Old 07-25-2009, 04:34 AM   #6
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Originally Posted by camarogolfguy View Post
Excuse my igorance, Lugging?

Also, I have noticed the car asking me to go from 1st to 4th at a slow acceleration. I am aware this a GM thing. My brother's 03 Vette also had this feature. I have been going into 2nd anyhow (it fights me a bit, but will make the shift into 2nd). It just doesn't make sense to skip the two gears when the rpm's can't be much more than 1200 or so at the point it wants me to go directly into 4th. If I don't skip shift, is this going to cause a problem?
Lugging the motor means to have the RPMs too low while starting out in a particular gear. When you release the clutch you'll get a slight clunk and then the motor will "lug" along, and make it feel like the whole car is shaking.

That is the main reason why I hate skip shift. It forces you into lugging the hell out of the motor. It's designed to help you get better gas mileage, but I dont like skipping 2 gears, it makes the car barely crawl forward. I do the 1-3-5 alot, and it keeps the rpms low while still allowing me drive in a way that feels more natural for my driving style.

I agree with Back in Black, do NOT force the shifter when the computer is telling you to 1-4 shift. You can step on the gas a bit longer in 1st... or what I like to do is trick the computer a little... I juke it... Basically, when I get the 1-4 shift on the DIC, I put the clutch in and pull the shifter out of first and ever so barely move it down to 4th, just a tiny hair and it's enough to turn the 1-4 solenoid in the tranny off. So I've got it down to a silence when someone's sitting next to me they never notice that it took me an extra splits second to shift from first to third.

And the best part is it's almost a natural motion. Pull the shifter out of first and it slaps to the center, ever so gently move the shifter torwards 4th for a split second and then push it up into third in a nice, affirmative motion, that's all it takes...
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Old 07-25-2009, 04:50 AM   #7
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Can you get rid of the SKip SHift in competition mode?
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Old 07-25-2009, 12:50 PM   #8
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Quote:
Originally Posted by JDBeck23 View Post
Well from your description it sounds like you're lugging the car a bit when shifting (which actually is normal since these cars are designed to be skip shifted and lugged in the next gear). If you take the revs up a little higher you'll notice that the clunk goes away.

The clunk is the slack in the driveline. Because of the IRS, you now have 2 extra U joints that will "slack" when you press the clutch in to shift and then when you begin to let the clutch back out, that "slack" is drawn back up quickly. It's very normal for IRS cars.

But if you're concerned, by all means, take the car into the dealer and have her looked at.

And you havent been driving your car hard enough to encounter the "failure" problem yet. Rev it to 5k and dump the clutch (just kidding, dont do that during break in!) and you'll find out if your tranny is one of the broken ones!
My transmission broke and i didn't even drive it hard.
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Old 09-04-2009, 10:56 AM   #9
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re

Ok so my first impression, When on the Highway, lets say Cruising at whatever speed in 6th, you let off the gas for whatever reason then give it the gas again, there is a Thud/clunk. Not talking about tromping on it either here, just normal lift pressure from pedal and re-aapply it.

Is this the same thing? i can understand the IRS and the extra linkage, but it seems like it is prominent.
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Old 09-04-2009, 11:05 AM   #10
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Quote:
Originally Posted by JDBeck23 View Post
Lugging the motor means to have the RPMs too low while starting out in a particular gear. When you release the clutch you'll get a slight clunk and then the motor will "lug" along, and make it feel like the whole car is shaking.

That is the main reason why I hate skip shift. It forces you into lugging the hell out of the motor. It's designed to help you get better gas mileage, but I dont like skipping 2 gears, it makes the car barely crawl forward. I do the 1-3-5 alot, and it keeps the rpms low while still allowing me drive in a way that feels more natural for my driving style.

I agree with Back in Black, do NOT force the shifter when the computer is telling you to 1-4 shift. You can step on the gas a bit longer in 1st... or what I like to do is trick the computer a little... I juke it... Basically, when I get the 1-4 shift on the DIC, I put the clutch in and pull the shifter out of first and ever so barely move it down to 4th, just a tiny hair and it's enough to turn the 1-4 solenoid in the tranny off. So I've got it down to a silence when someone's sitting next to me they never notice that it took me an extra splits second to shift from first to third.

And the best part is it's almost a natural motion. Pull the shifter out of first and it slaps to the center, ever so gently move the shifter torwards 4th for a split second and then push it up into third in a nice, affirmative motion, that's all it takes...
Can't you just go from 1st, to 3rd, then to 4th? That's how I drove a buddy's 4th gen 6 speed with no problem.
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Old 10-17-2009, 11:29 AM   #11
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help Im hearing the same type of clunking noise at very low speeds in my v6 6speed. It only happens when I'm in first gear and it continues when I'm driving in first up to about 15 miles per hour, when I shift into second it is fine. The car has only 100 miles on it
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Old 10-17-2009, 05:00 PM   #12
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if you're hearing a clunk while in gear and accelerating, that's a different problem and you need to take your car to the dealer have them look at it. That's not normal.
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Old 10-23-2009, 07:55 PM   #13
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help Im hearing the same type of clunking noise at very low speeds in my v6 6speed. It only happens when I'm in first gear and it continues when I'm driving in first up to about 15 miles per hour, when I shift into second it is fine. The car has only 100 miles on it
I'm having a similar issue with my V6 6M. When I shift from 1st to 2nd, I get a clunk as I let the clutch out. I've found it very difficult to have a nice smooth acceleration because the 1st to 2nd transition is so rough. I've got about 250 miles on mine so far. I'm hoping some of this may go away as the transmission breaks in and as I get better at driving it.
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Old 10-24-2009, 06:47 AM   #14
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With a two-piece drive shaft, you are bound to have a clunk due to slack as JDBeck23 stated. A lot of guys on the Mustang forums have gone to the "traditional" one-piece drive shaft and doing so eliminated the "clunk" that is also present in the Mustangs. For whatever reason, a two-piece is somehow more cost effective from a manufacturing standpoint than a one-piece.
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Old 10-24-2009, 09:29 PM   #15
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Mustangs and Camaros all have wide tolerances that cause drive train slop when rowing the gears. Once you get into the next gear everything tightens up in that direction and shifts are normal. But as soon as you shift out of order or start shifting in the other direction you get the clunking again as everything lines up the other way. Nature of the beasts. The ones that do not, have better tolerances. Consider yourself lucky in that case. These are not BMWs after all. I've owned two late model Camaros ('95 and '98) and two late model Mustangs ('03 Mach 1 and '06 GT) and they were all the same. It's normal. Ditto for the transmission rattles. Come up through the shifter as a vibration. If you want to hear a real noise, try an after-market shifter. I've done it twice and both times had them removed. Don't learn I guess.

This was part of my reply to another thread.

Regarding the skip-shift; just accelerate a little harder and shift at a higher RPM or short-shift direct to third gear. The 4th gens had the same fuel-saving feature, but could be defeated with a $29 resister plugged into the transmission housing and did not throw any codes. Should be available from someone soon or maybe it can be removed with one of the plug-in tuning devices. Anyone know?

Cheers.
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Old 04-08-2010, 10:59 AM   #16
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Summit has a skip shift defeat plug and works great.
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Old 04-08-2010, 02:59 PM   #17
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Quote:
Originally Posted by camarogolfguy View Post
Excuse my igorance, Lugging?

Also, I have noticed the car asking me to go from 1st to 4th at a slow acceleration. I am aware this a GM thing. My brother's 03 Vette also had this feature. I have been going into 2nd anyhow (it fights me a bit, but will make the shift into 2nd). It just doesn't make sense to skip the two gears when the rpm's can't be much more than 1200 or so at the point it wants me to go directly into 4th. If I don't skip shift, is this going to cause a problem?
Ouch

It hurts me to read this.

You will destroy the synchro if you keep trying to force it like that.
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Old 09-26-2010, 11:06 PM   #18
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I have many of the same issues with my 2010 1ss m6, it just seems to me most of th slop is in the transmission. The dealership says it's normal, but I think it's embarrassing when you can hear the rattle/clunk outside of the vehicle... I say fix it or buy that noisy junk back, after all mustang transmission is made in China and does not make noises like that.
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Old 09-28-2010, 04:22 PM   #19
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I have this problem with my 2SS too. It only happens when i'm driving slow in 1st or 2nd gear it'll happen either when I let go of the gas or depress the clutch. I had this problem with my other stick cars too one was a 2006 Scion xB and my 2007 BMW 550i..
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Old 10-29-2010, 10:15 PM   #20
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I am having the same type of noise but mine is more like a backlash/ clunking issue in the rearend. I took it in to the service department and they REPLACED the rearend and gave it back to me. Unfortunately this didn't fix the problem so I took it back. This time they had a Chevy engineer come in and diagnose the problem. He acknowledged a problem that is a reoccurring problem in other 2010 Camaro's but said Chevrolet has no official fix for it yet and deemed it "servicable". My Chevy dealer gave me the number to the GM warranty department and they are now investigating the problem.
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