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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Magic1 on February 18, 2014, 10:10:54 pm

Title: rear axle swap
Post by: Magic1 on February 18, 2014, 10:10:54 pm

I'm working on an 82 gmc Sierra 4x4 and I'm wondering if anyone knows which years will swap without modifying anything. I'm pretty sure 73-87 will but is 87 the cutoff year or does it go up into the 90s.

Title: Re: rear axle swap
Post by: Captkaos on February 18, 2014, 10:26:31 pm

bolt in is 1982-1987 if you want a 10bolt, if you want a 14bolt, anything from 73-87(91) but in the same bodystyle, but the ujoints and yokes are different.
If you care to use a 12 bolt 73-81 will work also, but you will need a hybrid ujoint to use your current driveshaft.

Title: Re: rear axle swap
Post by: Magic1 on February 19, 2014, 09:42:51 am

I've currently got a 12 bolt in it now so to go to a ten bolt will I be able to use my drive shaft by going with a different u-joint?

Title: Re: rear axle swap
Post by: Captkaos on February 19, 2014, 01:35:33 pm

You should be able to.

Title: Re: rear axle swap
Post by: Magic1 on February 19, 2014, 05:52:57 pm

Ok. One more question. I'm considering just keeping my 12 bolt and ditching the open carrier for a locker. Most of the ones I'm looking at specify 30 spline axles in the rear. Are all gm 12 bolt truck diffs equipped with 30 count splines or are there variations?

Title: Re: rear axle swap
Post by: Captkaos on February 19, 2014, 11:15:03 pm

All 12bolts Truck axles were 30 spline.

Title: Re: rear axle swap
Post by: Magic1 on February 25, 2014, 08:40:20 am

Thanks for the help. Went with a Spartan locker and installed it over the weekend. Fixed it right up!