View Single Post
Old 01-05-2008, 10:26 AM   #5
67ChevyRedneck
Hittin E-Z Street on Mud Tires
 
67ChevyRedneck's Avatar
 
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
Re: Better Gas Mileage Ideas for Classic Chevy

A Th350 with a 3.08 gear will do almost as well as a 700R4 with a 3.73 and save you a couple grand as well.

I have a carburated 350 with a 700R4 and 3.73 and get 12.5-13 city and 15-16 highway. It's about the best these aerodynamic bricks can do.

If you want to spend some big money, a 5.3L/4l60/with a 3.42 rear end will probably get you 14 city and 18-19 highway.

I think the best option is a small diesel with a 5 or 6 speed. I could see that easily pushing one of these trucks into the 20's. But again, very costly???
__________________
Jesse James
1967 C10 SWB Stepside: 350/700R4/3.73
1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc
1968 Pontiac Firebird: Project Fire Chicken!
2015 Silverado Double Cab 5.3L Z71
2001 Jeep Wrangler Sport 4.0L 5spd
2020 Chevrolet Equinox Premium 2.0L Turbo
2011 Mustang V6 ~ Wife's ride
American Born, Country by the Grace of God
1967 CST Shop Truck Rebuild!
My 1967 C-10 Build Thread
My Vintage Air A/C Install
Project "On a Dime"
Trying my hand at Home Renovation!
1965 Mustang Modifications!

Last edited by 67ChevyRedneck; 01-05-2008 at 10:28 AM.
67ChevyRedneck is offline   Reply With Quote