Clunking noise when shifting gears. Help?

Reply Subscribe

Thread Tools

Search this Thread

Jul 24, 2007 | 09:02 PM

vette blue

Thread Starter

Instructor

Joined: Jan 2007

Posts: 191

Likes: 1

From: MONTREAL QUEBEC

Clunking noise when shifting gears. Help?

Hi, My 71 small block, Muncie 4 speed goes clunk everytime I shift from 1st to 2nd and 2nd to 3rd unless I really slowly let the clutch out.
I changed the big rubber cushion mount on the differential and this took away the clunk from a standstill in first gear but it is still clunking in the other gears. I haven't checked the tranny mount yet but the motor mounts are in good shape.

What should I be looking for?

Jul 24, 2007 | 09:43 PM

blue70ray

Intermediate

Joined: Jun 2005

Posts: 31

Likes: 0

From: Collingswood NJ

Your u-joints could be worn and have some play to them. This might be the sound you hear...

Jul 24, 2007 | 09:45 PM

hutch70

Instructor

Joined: Dec 2000

Posts: 109

Likes: 0

From: Wadsworth, Ohio oh

Quote:

Originally Posted by blue70ray

Your u-joints could be worn and have some play to them. This might be the sound you hear...

Jul 24, 2007 | 09:55 PM

vette blue

Thread Starter

Instructor

Joined: Jan 2007

Posts: 191

Likes: 1

From: MONTREAL QUEBEC

Clunk only happens when clutch is released into 2nd and runs quiet until shifted into 3rd. Shifts quietly into 4th.
Wouldn't u joints be a constant noise?
Also u joints were inspected and passed. Is there any other part that could be the culprit?

Jul 24, 2007 | 10:22 PM

blue70ray

Intermediate

Joined: Jun 2005

Posts: 31

Likes: 0

From: Collingswood NJ

You would only here the noise when you initially shift into gear and not while in gear. Did you have all the u-joints checked including the half shafts?

Jul 24, 2007 | 10:25 PM

vette blue

Thread Starter

Instructor

Joined: Jan 2007

Posts: 191

Likes: 1

From: MONTREAL QUEBEC

I know he checked the half shafts and drive shaft. How would I know if they are worn if I check them myself?

Jul 24, 2007 | 10:34 PM

blue70ray

Intermediate

Joined: Jun 2005

Posts: 31

Likes: 0

From: Collingswood NJ

That I'm not sure of. I had mine replaced when I started hearing the noise. You might be able to move the shafts if they are really worn but I don't think they are that bad. Oh, and when I had mine replaced I also had the main and half shafts balanced. I figured while they were off it was worth the extra doe.

Jul 27, 2007 | 02:49 PM

spanky01

1st Gear

Joined: Jul 2007

Posts: 1

Likes: 0

the rear diff if it has a lot of play in it will cause a clunk / even more so if your yokes going to your half shafts are worn out too this sound will be amplified by good but worn u joints