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factorystock · 04-07-2018, 02:45 PM

A 4.10 Eaton pumpkin is the easiest and cheapest swap ( just need to find one for a C 30, however I've heard C 20 pumpkins, much more plentiful, are the same), no modifications will be necessary, except the speedo will be slightly off. As Short 3/4 ton mentioned, much more common in 69-72 C 20's with V8 automatic, harder to find in any other model. Never seen or heard of the mythical Eaton Ho52 3.90. The good news about a complete rear axle swap to a higher ratio is your truck has leaf springs, which are used on all newer 1 tons. ( IMO 3.73 would be best, any higher ratio 3.20-3.50 you'll loose pulling power in a heavy truck)

04-07-2018, 02:45 PM	#14
factorystock Registered User Join Date: Feb 2007 Location: west coast Posts: 3,354	Re: 63' Chevy C30 Dually Rear End Identification A 4.10 Eaton pumpkin is the easiest and cheapest swap ( just need to find one for a C 30, however I've heard C 20 pumpkins, much more plentiful, are the same), no modifications will be necessary, except the speedo will be slightly off. As Short 3/4 ton mentioned, much more common in 69-72 C 20's with V8 automatic, harder to find in any other model. Never seen or heard of the mythical Eaton Ho52 3.90. The good news about a complete rear axle swap to a higher ratio is your truck has leaf springs, which are used on all newer 1 tons. ( IMO 3.73 would be best, any higher ratio 3.20-3.50 you'll loose pulling power in a heavy truck) Last edited by factorystock; 04-07-2018 at 02:50 PM.