Easy to do, change the differential to 4.11's, either HO52 or HO72's from a Chevrolet or GMC C20 or C30 from the mid 60's to I think 1972. Hard part is actually finding said 4.11's. The most likely candidate will be a C20 or C30 with automatic and V8. That said, I found a set in a 67 C20 with 4 speed and 8 cylinder. Online search of salvage yards will sometimes turn one up. Mine was in an old junk/salvage yard on a back country road. Paid $200 and I removed it.
Good Luck,
RonR
Last edited by moparguy; 08/05/2017 9:43 PM.