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Re: Looking for Overdrive Option for 1986 GMC C-60Posted by D13 on March 27, 2007 at 02:17:10 from (198.208.251.22): In Reply to: Looking for Overdrive Option for 1986 GMC C-60 posted by Bill on March 26, 2007 at 16:35:06: I guess I'm not seeing a problem here. These trucks were built to run 55mph not 70mph. At 70mph best have really gone thru the steering and brakes. The other thing to watch with the 2 speeds is some of them are low and lower gear, i.e. the slow gear is a grunt gear and the high gear no faster than what you have. Be sure to check ratios. Also you may be able to swap the trans to one with a higher 5th gear.
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