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67ChevyRedneck · 01-05-2008, 10:26 AM

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???

01-05-2008, 10:26 AM	#5
67ChevyRedneck Hittin E-Z Street on Mud Tires 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.