thunking noise when going into reverse
 

just like the title says. i hear a thunking noise all most everytime that i shift into reverse. from both park and neutral. please let me know what you guys think.

Check the bushings that support the rear differential. There are two of them located between the diff and the muffler. Both of mine were torn to pieces and I could move the diff around easily. If I was at home I'd post pictures, but I'm at work so pics will have to wait.

I had thought it was the transmission support that was damaged, and as it was being replaced, I noticed those bushings were bad too. Replacing the the tranny support solved some of the clunking, but it was in much better shape than the rear bushings, and a few days later when those came in and got replaced the clunking was eliminated completely.

Pictures would be greatly appreciated.

I get that clunk when going from reverse in to drive.http://forums.probetalk.com/images/s.../icon_werd.gif

reverse thunk
 

For shock going from N to R, the ATSG troubleshooting chart suggests the following in order of most likely culprit;

Valve sticking

Faulty 4A accumulator

Deterioration of ATF.

I think the first two are located in the pan and would not require pulling the tranny to have your transmission specialist cure the problem.

Joe:)

[As above, bad support bushes does also create this problem]

forward thunk...
 

Again, the troubleshooting chart suggests the following in order of most likely....

Deterioration of ATF

Faulty N-D accumulator

Valve sticking

Faulty TCU

Again, the two middle ones are in the cassette in the oil pan, and more easily fixable by somone who knows what they are doing.

Joe:)

Might not be tranny
 

Even though it is probably transmission-related, make sure you check out your cv axles. A faulty outer joint would cause a similar clunking noise to the one you are describing.

Here's a picture of the bushings, as promised:

http://www.shoden.org/images/cars/SV...ffBushings.jpg

Could also be motor/trans mounts.

Do you happen to have the part numbers for those Differential Bushings?

I was under the impression that those bushings were an integral part of the differential mounting subframe, and therefore not replaceable.

:confused:
:D

Jason.

They aren't listed as a replacement part on 92's but seem to be on 94's