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Old 05-27-2020, 09:17 PM
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Unhappy Rear u-joint in my 56.

Drive shaft was bent in my 56, pulled to have it straightened as best it could. When I pulled the shaft I could not see anything to help center it in the rear yoke. No notches where the cups ride, c-clips on the joint are too far inboard to help. What am I missing?

Thanks, Colt

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  #2  
Old 05-28-2020, 01:05 AM
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Jack Gifford Jack Gifford is offline
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Do the cups or saddles have C-clip grooves? My junk box has a bunch of clips that I THINK were from Pontiacs of those years.

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Old 05-28-2020, 12:57 PM
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Quote:
Originally Posted by Jack Gifford View Post
Do the cups or saddles have C-clip grooves? My junk box has a bunch of clips that I THINK were from Pontiacs of those years.
Thanks Jack, there is a provision for c-clips on the cups but they are to far in to do any good. With clips in place there is still about 1/2 " of side to side movement. I thought maybe there was some special retainer of some sort that was missing.

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37 Pontiac Sedan 455 700r4
94 Firehawk Supercharged 5.7 LT1 6spd.
77 Grand Prix base model, 350 pontiac
97 F250 7.3 turbo diesel
85 CJ7 Laredo
65 Impala SS 396, 4 spd, A/C.
  #4  
Old 05-29-2020, 02:01 AM
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Jack Gifford Jack Gifford is offline
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Sorry I'm no help. Been too many years gone by.

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... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
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Old 05-29-2020, 09:45 AM
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I think I found the solution.

https://images.app.goo.gl/DTEGqavtrdAutskC9

Thanks for trying!

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37 Pontiac Sedan 455 700r4
94 Firehawk Supercharged 5.7 LT1 6spd.
77 Grand Prix base model, 350 pontiac
97 F250 7.3 turbo diesel
85 CJ7 Laredo
65 Impala SS 396, 4 spd, A/C.
  #6  
Old 05-29-2020, 10:39 AM
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Sirrotica Sirrotica is offline
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Rock Auto shows pictures of all the 56 U joints they sell, and they all show inner cir-clips on all 4 caps, on every version..............

It shows the dimension as 2.256" as the distance from outer edge of the clips.

The one you linked to is a double cardan CV type joint from my experience. I also owned a 56 probably close to 50 years ago, so as Jack said, too long ago to remember that particular detail.

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Last edited by Sirrotica; 05-29-2020 at 10:51 AM.
  #7  
Old 05-29-2020, 03:33 PM
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Would this drawing from the Pontiac 1960 Master Parts Catalog help or just confuse the issue?
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Old 05-29-2020, 04:49 PM
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Quote:
Originally Posted by Bill Hanlon View Post
Would this drawing from the Pontiac 1960 Master Parts Catalog help or just confuse the issue?
From that GM parts book drawing, it looks like the same joint as he showed from the AMAZON link. Rock Auto obviously has misinformation on their replacement parts, not the first time the aftermarket was wrong though.

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1973 T/A (SOLD)
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1984 Grand Prix

100% Pontiacs in my driveway!!! What's in your driveway?

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  #9  
Old 06-12-2020, 08:30 AM
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Bill Eveland Bill Eveland is offline
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I thought 55 was the last year of the mechanics u joint and 56 went to a regular style 3010 joint? I have an extra 55 driveshaft if your looking, would have to double check it against your length

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