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Swapping 4.56 to 3.73 or maybe 4.10
I run my 78 K20 stock. I carry lumber/tools in the bed, but I rarely/never tow. I have 4.56 gearing in the rear. I get terrible gas milage. Has anyone swapped to a 4.10? How much better was your milage? I know my GM 10.5" 14 bolt only came in 4.10 or 4.56 originally. Can you go down to a 3.73? Thanks!
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1978 K20 Camper Special, stock 350, TH400, np203, 265/75R16, GMC 10.5" rear, Dana 44 front 3.73, Q-jet.
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