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Old 05-15-2013, 02:09 PM
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1987 Chevy R10 rear swap questions

I have a 1987 Chevy pick up (R10) with a 10 bolt 5 lug rear. I want to put in a 1976 12 bolt 5 lug rear. I am a beginer to rebuilds, and I have done everything to the truck from the motor build to paint and this is the last portion. Can anyone please help me out and let me know what I need to get/ use to make this swap happen. From what I understand the U joints for both the 10 bolt yoke and 12 bolt yoke are the same 1310joints. I understand the shock mounts are the same.

My concerns:
Drive shaft length to change?
Yokes U joints are different.

If anyone can point me to a article or help me out I would appreciate it. I really do not want to drop the rear to find out the 12 bolt will not work. the onyl other option I have is replacing the gears and axles on the 10 bolt which I know would be more work and learning.

Thanks

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Old 05-15-2013, 03:45 PM
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measure from the axle centerline to the u joint yoke on both, if basicly the same the driveshaft lenth will be fine.. if over 1" difference you'll have to install rear and see..
both the 87 and 76 list same u joint so the yoke should be fine..
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Old 05-15-2013, 08:20 PM
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The u joint is not a 1310, it's a 3R. GM started using the 3R in '76.
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Old 05-16-2013, 06:27 AM
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Ok Ill measure this weakend. So the joints should be the same from what I am reading and they are both 3R.

Ill post some photos later and see what you all think
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