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| Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here. |
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#1
October 9th, 2015, 01:20 AM
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What Differential is a good replacement?
My 1960 K1000 has a bad rear diff. Would like to find a used one. Rebuild is too expensive. It's now a 10 bolt, believe to be HO35. Not many around with 3.92 ratio. Would like a 12 bolt. Also what about a 3.73 rear, they are more available. Is this too much mismatch?
Also a few available 55-59 rears with 3.90. The covers are WWI helmet shape, mine has a ring gear bulge shape? I believe HO35 was 55-62....so were there different covers or do I not have a HO35? 
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#2
October 9th, 2015, 03:08 AM
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Re: What Differential is a good replacement?
Generally half ton GMC trucks from 60-66 and later years up to 68 came with the Dana 44 rear differential in both 2wd and 4wd. At some point the one in your truck was changed out. A 12 bolt would most likely be more readily available but the correct differential would be a Dana 44, same goes for 1955-59 GMC trucks.
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#3
October 9th, 2015, 03:44 AM
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Re: What Differential is a good replacement?
My 1960 GMC Manual says the available Diff was HO33 front and HO35 rear. My cover looks like a Dana 44.
Last edited by AZKen; October 9th, 2015 at 08:39 AM.
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