Author Topic: Pinion yolk 10 bolt vs 12 bolt  (Read 3545 times)


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Pinion yolk 10 bolt vs 12 bolt
« on: May 21, 2016, 09:59:55 PM »
Ok, finally installing OEM  (PI 1205G) 12 bolt with single hole radius rod bracket in my L48. The original has been missing since car was purchased in 1984, a 10 bolt had been install in in its place. Just noticed the pinion yolk U bolt holes are fractionally farther apart on the 12 vs. the 10. I'd rather get some real advice via this forum vs asking parts supply house on how to mitigate this problem. The 12 yolk also looks a little longer. My first intuition is the 12 bolt yoke is not original, so keeping that in mind, should a OEM 12 bolt, be a direct bolt up to a 10 bolt universal and drive shaft?

Thanks in advance,


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Re: Pinion yolk 10 bolt vs 12 bolt
« Reply #1 on: July 18, 2016, 04:43:12 PM »
should be same U-bolts, for the same u-joint. I know in 69 they went to straps and bolts than 70 there was a larger yoke for 1350 U-Joints on some but not all IIRC
69 RS/Z DZ302 Daytona bumble bee
69 T/A clone LS6/6sp
69 Nova SS 396


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Re: Pinion yolk 10 bolt vs 12 bolt
« Reply #2 on: July 18, 2016, 06:18:43 PM »
Make sure to measure before making a final purchase.

Original is a 1310 style of joint IIRC..  My 67 had an aftermarket on it (diff yoke) and I had to use a conversion u-joint to make it work.  But to answer your question they should be the same or interchangeable.

If the cups are the same size then this should be the correct one but please measure to make 100% sure.,93581.html?sku=91045134&utm_medium=CSEGoogle&utm_source=CSE&utm_campaign=CSEGOOGLE&gclid=CNSBmbnM_c0CFdgGgQodH68O4w

Material Type:           Steel
Sold in Quantity:   Each
MFG. Part #:           5-134X
Cap Diameter A:   1.062
Cap Diameter B:   1.062
Width A:                   3.219
Width B:                   3.625

If your cups are different sizes then this is the other option.  Again measure before assuming anything.

Universal Joint Style: Spicer 1310-Spicer 1350 combination
Bearing Cap Style:                             4 plain
Bearing Cap Diameter (in) Axis 1:       1.063 in.
Width Overall (in) Axis 1:                   3.218 in.
Bearing Cap Diameter (in) Axis 2:       1.188 in.
Width Overall (in) Axis 2:                   3.622 in.
Universal Joint Material:                     Steel

If I had to guess the 1st option would be the correct one for you.  Your local auto parts store should stock these or at least be able to get them in a day or so..


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Re: Pinion yolk 10 bolt vs 12 bolt
« Reply #3 on: August 21, 2016, 11:26:53 PM »
BTw! Thanks for the responses, installed and feeling whole again.