U-Joint size - Pontiac GTO Forum
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post #1 of 7 (permalink) Old 03-02-2016, 09:25 PM Thread Starter
 
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U-Joint size

I just bought a fresh 12 bolt for the 65. My question is my driveshaft and old axle are out of a 442 with 3R ujoint. New axle is 1310 and old was Saginaw 3r. Can anyone tell me id the Saginaw 3r is the same as the spicer 1344. I am trying to find a conversion u-joint from 3r to 1310 and I can find 1310 to 1344. Dimensions are very close. Any help is appreciated. I would like to find something strong and not just a store brand. Thanks
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post #2 of 7 (permalink) Old 03-02-2016, 10:23 PM
 
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GTO's (and Pontiac LeMans) used the 3R ujoints from '64-73. 442's always used the 3R. Most Chevrolet 12 bolt rears accepted the common Spicer 1310 .

The conversion ujoint you need is a NEAPCO 3-1330, Precision 372 will also work. In building differentials I always build with the correct pinion flange, so don't have to deal with adaptor ujoints.
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post #3 of 7 (permalink) Old 03-03-2016, 06:31 AM Thread Starter
 
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Thanks .The Precision 372 is one of the ones that says 1310 to 1344. Thats what I wanted to verify. I can get the moog 372 locally just wanted to make sure it would fit. I am not r running crazy HP but I wanted to make sure I got a strong ujoint. Any issues with strength either of these part numbers you gave me?
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post #4 of 7 (permalink) Old 03-03-2016, 11:26 AM
 
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Built several bracket racers, all with a 12-bolt rear. Used one of the conversion joints in every one. Never broke a joint or had any joint or DS problems. And this was using big slicks. Don't think you'd ever break one, on hard street tires.

The Neapco 3-3130 looks to be only $11.99 + tax @ Advance.

http://shop.advanceautoparts.com/p/n...Sr0aAovH8P8HAQ

O'Reilly shows a 372 for $8.99 + Tax.

http://www.oreillyauto.com/site/c/de...ngeSearch=true

The Precision 372 is about $17 shipped from Ebay.

http://www.ebay.com/itm/PRECISION-37...3D281136360920

http://www.ebay.com/itm/Precision-37...-/281136360920

Last edited by oldskool; 03-03-2016 at 11:55 AM.
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post #5 of 7 (permalink) Old 03-03-2016, 04:00 PM Thread Starter
 
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I appreciate the info Thanks
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post #6 of 7 (permalink) Old 03-03-2016, 05:34 PM
 
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never heard of someone bustin a u-joint or a manufacturer making a crappy one.
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post #7 of 7 (permalink) Old 03-03-2016, 05:54 PM
 
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Some of the guys over on the Pontiac Drag Racers Facebook page say they have broken joints, which in turn, caused a lot of other damage.

They tried to talk me into going with a shaft which uses the big 1350 joints. But, I just have a mild pump gas 455 footbraker bracket car. I don't need the big joints.

Then, somebody else said that if I was going to use the small 1310 joints, I should at least get the non-greasable kind. They say that the threaded hole and grease channels, weaken the joint. But, I've never broken a greasable joint before. And since I'm not using a trans-brake, I don't think I'll break one now.

http://www.wranglerforum.com/f210/u-...le-356026.html

"... or a manufacturer making a crappy one."

I've read that there are some inferior grade Chinese joints & slip yokes.

http://www.made-in-china.com/multi-s...Catalog/1.html

Last edited by oldskool; 03-03-2016 at 06:22 PM.
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