Play in the drivetrain
#22
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Just wondering if there was any update here.
As of now I have replaced:
Motor mounts
Snub mount
Transmission mounts
Apikol rear differential mount
Rear differential stabilizer bushings
I still get the thud, and Im not sure where else it could be coming from. I think it may be the driveshaft at this point. The center u-joint was solid as a rock when i checked it. The rubber around the center support bearing looked like it has slid down the shaft a little bit and it was fairly soft.
One thing I also noticed is that if I reverse, I hear a clank. When I put it back in gear and accelerate after reversing, I sometimes also hear the clank.
I just want the car to drive nicely again. Wheel bearings, control arms, and new suspension are all in order too :/
As of now I have replaced:
Motor mounts
Snub mount
Transmission mounts
Apikol rear differential mount
Rear differential stabilizer bushings
I still get the thud, and Im not sure where else it could be coming from. I think it may be the driveshaft at this point. The center u-joint was solid as a rock when i checked it. The rubber around the center support bearing looked like it has slid down the shaft a little bit and it was fairly soft.
One thing I also noticed is that if I reverse, I hear a clank. When I put it back in gear and accelerate after reversing, I sometimes also hear the clank.
I just want the car to drive nicely again. Wheel bearings, control arms, and new suspension are all in order too :/
#23
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Do check both the carrier bearing as well as the u-joint as both can be bad (trust me you don't want to replace one to find out the other is also bad).
Also, some driveshafts have u-joints that are pressed and crimped into place making them extremely difficult if not nearly impossible to rebuild.
Last edited by BlkBullitt; 02-12-2010 at 12:22 PM.
#27
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Any new updates? Over the last couple years I have checked and double checked mounts, u-joints, ect. Had a couple shops check it out too. I'm starting to think its in the transmission, that is where the rotational looseness on the driveshaft is comming from.
#29
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i have had the same thud noise on my 2.8 a4 quattro. replaced all 3 rear diff mounts and at the same time found my carrier bearing messed. the thud noise was corrected after i replaced the rear diff mount at the front of the rear diff. if you have a vibration and thud noise happening chk the drive shaft and center carrier bearing. stealership charges close to $1400 for a new drive shaft. there is a place in dallas, texas that can rebuild your drive shaft and replace the center carrier bearing. turn around time is 2-3 days they stay busy.
#30
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PROBLEM FINALLY SOLVED
After living with the clunk for many years, I finally got it into a good shop. They diagnosed it as a bad differential. New Audi differential is $3500. The shop found a used diff for $350 including shipping. Wow what a huge difference. Feels almost new - and with 250K miles on my A4 that is saying something.
Thanks to Tom and Walt at Everything Euro in Winston Salem NC - best independent shop that I have found.
After living with the clunk for many years, I finally got it into a good shop. They diagnosed it as a bad differential. New Audi differential is $3500. The shop found a used diff for $350 including shipping. Wow what a huge difference. Feels almost new - and with 250K miles on my A4 that is saying something.
Thanks to Tom and Walt at Everything Euro in Winston Salem NC - best independent shop that I have found.