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Discussion Starter #1
I have a '91 TT. When I floor it in 1st, there is a thump-thump-thump sound that comps from the rear of the car. It sounds kind of like the drive shaft is hitting the undercarriage of the car. It will do it in 2nd sometimes if accelorating hard up an incline but otherwise it's a 1st gear, hard acceloration problem.

What I do is to be careful an not jump on it so this is only an issue when I forget (or am next to a 300ZX at a stoplight). As sure as I'm sitting here, something is going to break if I don't find the problem.

The Mitsu. dealer looked at it and couldn't identify anything wrong. He replaced a worn driveshaft support which seemed to help for a short while but eventually I was back to square one.

Does anyone have any advice?
 

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i've been dealing with this problem for over a year now, i've replaced both carrier suports, all the supports on the rear end, couple rear axle shafts, problem still there, you can feel it if you put your hand on the floarboard in the backseat, i'm as stumped as you are, my driveshaft play is all in spec, has anyone had this problem that actually broke something eventually?
 
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read my post

Hey dudes,
Do a search of the words "rear end" or "driveshaft" from the last month and you'll find the answer to my problem which sounds exactly like yours. My driveshaft rear section "spun" under hard acceleration and I also spent 2 years and lots o bucks chasing it. Problem solved, I bought a used shaft, noise is gone.
good luck,
Dan
 

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Look in the back in your spare tire hole, you all have old porn and oil cans sliding around.

Glad I could help!
:D
 

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I had the same problem, told the dealer about it, and I got a new driveshaft/carrier bearing assembly under warranty. They said the carrier bearings were shot, of course, and the driveshaft was actually twisted. I noticed that there was no thunk when letting the clutch out in first anymore, but unfortunately, I didn't get to test it under a hard acceleration because I found something else wrong (NOT the dealer's fault) and had to drive it straight back to the dealer, only 1 mile. :(
 

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havent had this problem with my 3s yet, but i had a thumping coming from my old 86 firebird, ended up the tranny mount was bad, and id accelerate and the rear end <pumpkin> would actually hit off the bottom of my floor board. Im sure this wasnt good for a 700r4 tranny with 159k on it :rolleyes:
 

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Discussion Starter #7
Thanks to all who have replied. I did a search on "driveshaft" as suggested and like what I found. The suggestion that the third section of the three piece driveshaft might be "turned" where two different diameters of tube come together sounds worthy of investigation. One posting said that, after replacing this with a used one for about $250, life was good once more. I'm going to have my '91 TT put on the lift and see what I can see.

I'll post the results of what I find.
 

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also check the rear engine roller mount to make sure it's not worn. If it gets worn it will allow the motor/trans to shift backwards under accelleration and the driveshaft will hit the bottom of the car as well.
 
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This topic seems to come up every couple of weeks and has had some very active discussion about possible causes and solutions for the clunking/thumping under hard acceleration.
Some of us have found various solutions, but it is still a FAQ.
How can we document these headscratchers? I certainly could have saved myself a lot of anguish if someone had solved this problem for me. (and believe me, I asked)
Any ideas how these items can be preserved in a searchable database?
btw, this is the best board on the web.
cheers, Dan
 

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Well since everyone else said to check something, I will put in my two cents, check your tranny fluid. Mine was low so I got thugmping noises but not under hard acc.
 
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