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Re: Project "Haulin Crap" 1986 CC dually.
Quote:
Originally Posted by Chevy3+3
Okay no biggie. I was just curious. I have the 454/Th400 setup in my truck with 4:10 axle ratio. My rpm's are about 2500-2600 when going about 55-57mph with 235/85/16 tires. I just wondered how much the OD unit lowered RPMs since the truck was similar to mine.
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Best Guess would be about 1800-1900. I know mine drops considerably. Im going to drop in a 4l80E and back it with the GV OD unit over the summer if i dont have to spend a whole lot on paint replacing doors and such. That way I have Over/over/drive. LOL
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