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Oct 14, 2010 | 09:29 PM

LannyL81

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Melting Slicks

Joined: Nov 2005

Posts: 3,323

Likes: 142

From: Green Valley Arizona

Question

Was pushing my 81 out of the garage by pushing on the rear tire with my hand.....and as the wheel rotated every few inches I could feel a "clunk"....like each U joint cup was binding; both sides did this.

I have replaced all U joints a few years ago...only have a couple thousand miles on them....is this something I need to look into further or probably okay??

Rear trailing arms rebuilts by VanSteel 300 miles ago.

??????????

Oct 14, 2010 | 09:58 PM

my 76 ray

Melting Slicks

Joined: Mar 2007

Posts: 2,520

Likes: 11

From: Hinckley OH

Take a look at the driveshaft U-joints. The driveshaft will turn 3-4 times for each revolution of the wheel. That might translate to every few inches and you might feel it in both wheels.

Oct 14, 2010 | 11:44 PM

davecour

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Joined: Sep 2010

Posts: 56

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From: Columbia Mo

my 75 was doing that ended up i changed my gear oil added the correct bottle of posi lube drove it less than a mile no more clunk good luck

Oct 16, 2010 | 06:58 AM

LannyL81

Thread Starter

Melting Slicks

Joined: Nov 2005

Posts: 3,323

Likes: 142

From: Green Valley Arizona

I will check he driveshaft U joints...but I think I changed them at the same time I did the halfshafts. Drove the car to and from work yesterday, 60 miles and all seemed to be fine.

I have never changed the differential fluid and so I think I really need to do this. I was going to change gears but never did, so besides the GM posi additive, any recommendations for fluid to use?

I have been searching the forum on best way to do this and looks like time for me to visit Harbor Freight for a pump...I knew I should have taken the cover off when I had it out of the car.....

Thanks

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