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davepl · 11-26-2015, 06:56 PM

These trucks will do 12-13 in a mix of city highway, no more. Yeah, you can pull some hero numbers downhill with the wind at your back, but there's no way a new fuel injected Tahoe gets 14 and your C10 gets 22.... but I digress.

A .67 overdrive turns 4.10s into 2.73s, so you really can't argue with overdrive transmissions. Or you could just change the rear end ratio to 3.08 or so.

11-26-2015, 06:56 PM	#13
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: Tips for daily driver mods 72 Cheyenne These trucks will do 12-13 in a mix of city highway, no more. Yeah, you can pull some hero numbers downhill with the wind at your back, but there's no way a new fuel injected Tahoe gets 14 and your C10 gets 22.... but I digress. A .67 overdrive turns 4.10s into 2.73s, so you really can't argue with overdrive transmissions. Or you could just change the rear end ratio to 3.08 or so. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible