Rear end trouble, help!

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Dec 24, 2006 | 05:24 AM

worship79

Thread Starter

Drifting

Joined: Jul 2005

Posts: 1,623

Likes: 29

From: The Netherlands

Rear end trouble, help!

Since my U-joints were replaced earlier this year, I still had clunks when driving slowly for a while (traffic jam). These cluncks also made the car shudder or even 'hop'.

Yesterday this also happened after a short period of slow driving (alsmost immediatly) and at one clunk the vette even moved sideways a little!

After a search I came to the conclusion cluncks when driving or shifting can have these causes:
- Transmission Mount
- Diff Mount
- U-Joints
- Transmission yoke worn
- Diff needs revision

The hopping as if a wheel is blocked really worries me. At speed no troubles at all. Any thoughts on this?

I'll first change the diff oil, but I don't think that will solve the problem...

Help!

Dec 24, 2006 | 06:03 AM

onaqwst

Le Mans Master

Joined: Nov 2004

Posts: 7,186

Likes: 45

From: detroit area

check you t-arm bushings also.....they might be gone and that could be giving you extra motion/play.....

also look at the engine mounts.......

b

Dec 24, 2006 | 06:54 AM

kb2fzq

Burning Brakes

Joined: Aug 2005

Posts: 1,126

Likes: 0

From: Hudson Falls, N.Y. 76 Vette Modified L-48

Quote:

Originally Posted by worship79

Since my U-joints were replaced earlier this year, I still had clunks when driving slowly for a while (traffic jam). These cluncks also made the car shudder or even 'hop'.

Yesterday this also happened after a short period of slow driving (alsmost immediatly) and at one clunk the vette even moved sideways a little!

After a search I came to the conclusion cluncks when driving or shifting can have these causes:
- Transmission Mount
- Diff Mount
- U-Joints
- Transmission yoke worn
- Diff needs revision

The hopping as if a wheel is blocked really worries me. At speed no troubles at all. Any thoughts on this?

I'll first change the diff oil, but I don't think that will solve the problem...

Help!

This should be the first thing to do....you'd be surprised what a change that may make....

Dec 27, 2006 | 02:49 AM

duntovlives

Instructor

Joined: Mar 2003

Posts: 217

Likes: 1

From: Buffalo MO

could be the ole' posi chatter blues

Dec 27, 2006 | 03:56 AM

DMONSVETTE

Le Mans Master

Joined: Mar 2002

Posts: 8,575

Likes: 3

From: On an island surrounded by sharks Hawaii

Change rear end fluid now! Make sure to add the GM additive.

Dec 27, 2006 | 07:11 AM

BB72

Melting Slicks

Joined: Aug 2006

Posts: 3,429

Likes: 20

From: Kingston Ontario

Been there done that.

That happened to me, check to see if your front diff pinion bushing is worn. It will cause that hop at low speeds, sort of jerk the car especially at intersections but is fine when driving at speed.

Rob

Dec 27, 2006 | 11:45 AM

genuine1980

Burning Brakes

Joined: Sep 2006

Posts: 851

Likes: 10

From: Palm City, FL

Sounds like trailing arm bushings to me.

Dec 27, 2006 | 04:11 PM

C3 4ME

Le Mans Master

Joined: Oct 2005

Posts: 6,247

Likes: 471

From: Glen Allen, VA

Trailing arm bushings make the car jump to the side when you first get on the gas after coasting. You can also feel the care jump to the side when you first let off the gas.