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Wrong U-Joint?
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armyofuno
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Joined: 19 Aug 2007
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Location: Northern Lower Michigan
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1972 Buick Skylark

PostPosted: Tue Aug 28, 2007 3:24 pm    Post subject: Wrong U-Joint? Reply with quote

I recently went to replace the original rear U-Joint in my 99 2WD Tahoe. I found the U-Joint in good shape, but the yoke worn between the ears creating side to side slop of about .060".

O.K. Now I replace the U-Joint (just for good measure) and the worn pinion yoke. 1310 series in everybodies book (3 different shops). It still has about .030" side to side slop making it vibrate going down the road.

Has anybody else run into the problem like this?

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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue Aug 28, 2007 3:42 pm    Post subject: Reply with quote

aftermarket u-joints and yokes dont always fit well. if a quality brand wont work, you may have to get one from the dealer. is your new yoke a factory GM yoke ?

does it have the inner clips on the caps or tabs on the outer edges of the yoke to center the u-joint ?

what brand u-joint ?

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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af2
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1933 Willys Coupe

PostPosted: Tue Aug 28, 2007 3:52 pm    Post subject: Reply with quote

Was the yoke new GM?
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af2
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PostPosted: Tue Aug 28, 2007 3:57 pm    Post subject: Reply with quote

Also, if the drive shaft has any run-out it will eat yoke's.
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armyofuno
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1972 Buick Skylark

PostPosted: Tue Aug 28, 2007 5:32 pm    Post subject: Reply with quote

The replacement yoke is new GM.

The replacement is the 'high dollar' lifetime parts store replacement and it has inner clips.

It just seems odd to me because I had to burn out the U-Joint I replaced (O.E.) after 150K miles and new U-Joint and yoke should have rectified this slop even if the shaft had runout.

If the driveshaft had runout, I would think it would have taken it out long ago.

Also, the replacement U-Joint fits the driveshaft yoke perfectly.

I also thought about having a pair of Moroso style strap replacements made for this to center the U-Joint in the yoke, but that isn't really the fix I was looking for.

I could understand some difference between replacement and O.E. U-Joints, but .030"?

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af2
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1933 Willys Coupe

PostPosted: Tue Aug 28, 2007 6:00 pm    Post subject: Reply with quote

I don't want to defalt any Mfg's but!
I have used good and crap! I always use Spicier and they last! I believe the word Nippon ( sounds right) was a POS as with Precision sold by NAPA. Oh yea theirs too,
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue Aug 28, 2007 8:19 pm    Post subject: Reply with quote

armyofuno wrote:

Also, the replacement U-Joint fits the driveshaft yoke perfectly.




i dont understand this. i was under the impression that the new u-joint had .030 side-to-side play in the new yoke. i have had that problem and went through a bunch of different u-joints before getting one that would work.


just for reference, you could get a u-joint from the dealer, take measurements with a dial caliper and compare those to the parts you have. then just take back the u-joint if you dont need it.

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af2 wrote:
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armyofuno
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1972 Buick Skylark

PostPosted: Tue Aug 28, 2007 8:22 pm    Post subject: Reply with quote

After trotting my butt out to the garage and (caliper) checking the inside distance between the 2 U-Joints, (old vs. new) they check almost the same. (+/- .005" due to wear, I assume) So, I will have to get ahold of a Spicer U-Joint (5-625X I think. Correct me if I'm wrong)

I will keep you guys posted on my success, or lack thereof.

This is my first exposure to this type of problem. Has anyone seen it before? Either being a problem with the parts or something else?

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armyofuno
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PostPosted: Tue Aug 28, 2007 8:25 pm    Post subject: Reply with quote

Yes. the U-Joint fits the driveshaft yoke perfectly. Does not fit perfectly in the pinion yoke.
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10sec.et
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PostPosted: Tue Aug 28, 2007 9:46 pm    Post subject: Reply with quote

armyofuno wrote:
This is my first exposure to this type of problem. Has anyone seen it before? Either being a problem with the parts or something else?



10sec.et wrote:
i have had that problem and went through a bunch of different u-joints before getting one that would work.




a fellow co-worker (10+ years ago) had that EXACT problem with his 86 Chevy truck. i dont know what brand he ultimately used but it DID end up being a problem with the way most aftermarket u-joints are machined. drivetrain shops are also a big help with these problems. however, GM does weird things so you may end up needing one from the dealer Mad .

might not hurt to double check the part number on the new yoke. the parts guys at the dealers arent much better than the ones at Autozone.

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af2
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PostPosted: Tue Aug 28, 2007 11:11 pm    Post subject: Reply with quote

Just to make clear. You are speaking of the pinion? Not the transmission.
I know I sound stupid but need to be sure what side we are talking about!
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af2
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1933 Willys Coupe

PostPosted: Tue Aug 28, 2007 11:21 pm    Post subject: Reply with quote

10sec.et wrote:


. however, GM does weird things so you may end up needing one from the dealer Mad .
.


GM never did wierd stuff! Laughing Ever! Laughing Confused
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Big Dave
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PostPosted: Wed Aug 29, 2007 5:37 am    Post subject: Reply with quote

Sounds like the rounding error that NASA ran into when they were working on the Mars polar lander. The engineers in Europe were all using metric and those who were in Amerika were still working with archaic Enguish units. Result close, but no cigar.

I will wager that GM yoke was made overseas were they check everything to the nearest mm. When it left the factory they were happy with the nearest 64th of an inch. May have been machined to the correct number of decimals after the zero but were they measuring centimeters or inches?

Just a thought. One of these days we will have to move American school kids and their resistant parents to accept metric. We are the only country on the planet that has not gone over to the dark side yet.

Big Dave
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armyofuno
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1972 Buick Skylark

PostPosted: Wed Aug 29, 2007 5:38 am    Post subject: Reply with quote

Yes. The pinion is the sloppy one and the driveshaft fits correctly.

I'll pull it apart and take it to the dealer and see if Mr. Goodwrench can help me.

I'll keep eveyone advised.

Thanks,

Steve

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armyofuno
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1972 Buick Skylark

PostPosted: Fri Oct 19, 2007 11:17 am    Post subject: Reply with quote

YESS!!!!!!

After a character building trip to the GM dealership, it was a poor product issue. The GM joint fit perfectly. (Of course the counterguy shook his head and mumbled something about subgrade parts).


Lesson learned.

Steve

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