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What's better mpg? C-6 w/ GV OD or a ZF5

2K views 2 replies 3 participants last post by  outsidebear 
1986 F-250 4x4 standard cab c-6 4-speed, 4:10 gears, GV-overdrive, factory size tires. Drove from Tacoma, Washington to Butte, Montana, kept speed at 58 mph, about 1700-1800 rpms (going from memory here) got 21 mpg for the trip. Truck had GV in it when bought it. I really only use the GV as 4th over. I've had US Gear in an '84 Ford diesel. I would choose a US Gear over the GV, but don't think US Gear offering them anymore? About 115,000 miles on the truck. No turbo, factory setup under the hood. 3" stainless exhaust had been installed before I bought it. Nice truck, interior as new, good 'ol 55 mph paint job is peeling some, oh well, it's a truck... Gonna keep this truck forever I'm sure...
 
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