Axle Ratio
I Have 1990 GMC 7500 Topkick, Gas with five speed. The box has been shortened 10 feet. iT has a 2 speed rear axle. I never checked the axle ratio when purchased. It turns out I have a 7.17 to 9.19 ratio. Going to haul a 35 foot fifth wheel. With this ratio I am turning 5000 rpm at 50 mph. What would be my best axle ratio.And can I use a axle from any other mdt or just from a GM model.
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