Need help with drive line

[crazyjim]

I took a 1970 gmc 2 wheel drive and short boxed it.My donor truck was a 1976 c 10 front and rearend.I used the 3/4 ton drive line,so what universal will fit it? 3/4 ton one end 1/2 the other end any help thanks.

[mechanicalman]

It depends on your driveshaft.

I assume you have a small u-joint driveshaft and a large u-joint rear-end?

If so, you need an "adaptor" u-joint for the pinion end, a 1310 to 1350 style.

http://www.ringpinion.com/technicalh...plications.inc

You COULD get a driveshaft yoke for big u-joints and use big u-joints on both ends. Probably a good idea if you end up using a custom driveshaft.

http://www.dennysdriveshaft.com/c75_general_motors.html

[crazyjim]

I used the old end on drive shaft so the drive shaft needs a big one and the rearend needs a small one

[mechanicalman]

Originally Posted by crazyjim

I used the old end on drive shaft so the drive shaft needs a big one and the rearend needs a small one

You need a 1310 to 1350 adapter u-joint, easily obtained just follow this link. Install it in the direction that gives you the most grease zerc clearance, otherwise you may have to obtain a grease needle to maintain it.

https://www.google.com/#q=1310+to+1350+u+joint&tbm=shop

[crazyjim]

Ok thanks for your help.

[crazyjim]

I got the u joint, going to put it in Saturday.