10 bolt to 12 bolt swap

[87Flh]

At this point I am just planning ahead, I want to change my gears and install a posi. The reason I am considering a 12 bolt is because a friend has a posi for one. I think I will be better off keeping my 10 bolt.

[russgt]

Currently doing this swap, 10 to 12 bolt in my wife's 86. Had a good 12 bolt with a 3.08 posi (good eaton not a gov loc). Decided it was cheaper to put 3.73s in the 12 bolt than to buy a posi and gears to replace the 2.73s in the open 10 bolt.

[Mr.Chevy4x4]

The 12 bolt has a carrier break between 3.42:1 and 3.73:1, so you won't be able to use the eaton posi with 3.73 gears. That's another area where the 10 bolt is better. There is no carrier break for the 8.5.

Mike

[abig84]

Originally Posted by Mr.Chevy4x4

The 12 bolt has a carrier break between 3.42:1 and 3.73:1, so you won't be able to use the eaton posi with 3.73 gears. That's another area where the 10 bolt is better. There is no carrier break for the 8.5.

Mike

another minor issue with the 12bolt is its a little bit more rare then the 10bolt. if you snap a axle shaft you might have a little bit harder time running across one. they are slightly different in the c-clip area where as craigslist is usually littered with 10bolts

[russgt]

Originally Posted by Mr.Chevy4x4

The 12 bolt has a carrier break between 3.42:1 and 3.73:1, so you won't be able to use the eaton posi with 3.73 gears. That's another area where the 10 bolt is better. There is no carrier break for the 8.5.

Mike

That's why they make thick gear sets. I purchased a set from Richmond, it worked out great.
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