1987 Rear swap help
 

Need some help. I have a 1987 chevy R10 10 bolt 5 lug rear and I want to swap it out with a 1976 Chevy 12 bolt 5 lug rear out of a C10.

Can anyone tell me the U Joint spec sizes for these? I am coming up with the dimensions but not the diameter of the caps.

1987 - 1.13X1.13 2.37 x 2.37 outer
1976- 1.06x1.06 3.22X3.22 outer

I am assuming this are not interchangable and I will need a special u joint for them...

Re: 1987 Rear swap help
 

there is a conversion u-joint (precision is #372, spicer is 5-3022x ) you'll need .you will also need a longer driveshaft i believe, like an inch

Re: 1987 Rear swap help
 

hmm
that stinks. I thought these were drop ins for the 1/2 ton trucks. Thanks for letting me know.