72 3/4 to rear question? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1bad chevy · 05-12-2009, 06:54 AM

Doe's anyone here know what gear ratio's were used in these i have a 4.10 gear in her know but want to go higher do to a motor swap the old 500ci caddy motor don't like running at the rpm's it is at. It get's real thirsty lol need around a 3.42 to a 2.73 any idea's

pumpkin · 05-12-2009, 08:56 AM

Depends on the rear end you have now. If it is an eaton 4.10 is the best it gets, and you would have to put another diff in it to get the gears you want. If its a dana 60, then you can swap gears.

05-12-2009, 06:54 AM	#1
1bad chevy Registered User Join Date: Dec 2006 Location: POWNAL VERMONT Posts: 343	72 3/4 to rear question? Doe's anyone here know what gear ratio's were used in these i have a 4.10 gear in her know but want to go higher do to a motor swap the old 500ci caddy motor don't like running at the rpm's it is at. It get's real thirsty lol need around a 3.42 to a 2.73 any idea's __________________ 1972 c-20 chevy 500 caddy/4.10posi / 1972 3/4 ton gmc 350 4x4/4.10posi front&rear

05-12-2009, 08:56 AM	#2
pumpkin Registered User Join Date: Apr 2006 Location: East Sooke B.C. Canada Posts: 543	Re: 72 3/4 to rear question? Depends on the rear end you have now. If it is an eaton 4.10 is the best it gets, and you would have to put another diff in it to get the gears you want. If its a dana 60, then you can swap gears.

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