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jeffspower · 10-19-2009, 11:35 PM

I don't think the '85 will have a 12 bolt- unless someone swapped it in, it should have a 10 bolt. either way, as long as it is the same gear ratio, it can be made to work. I have a '75ish rear under my '68. You have to move the leaf spring perches in closer, move the shock mounts and swap park brake cables. Check the yoke for u-joint size too.

10-19-2009, 11:35 PM	#3
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: Help - 12 bolt rear swap for 71 C10 4X4 I don't think the '85 will have a 12 bolt- unless someone swapped it in, it should have a 10 bolt. either way, as long as it is the same gear ratio, it can be made to work. I have a '75ish rear under my '68. You have to move the leaf spring perches in closer, move the shock mounts and swap park brake cables. Check the yoke for u-joint size too. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car