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A 3-53 in that heavy of vehicle will not be very useful. 4-53T would be better. Same transmissions, 5 speed min. I have a 10 speed in mine. I’cooler, beef up front springs, etc. Cruise at about 1750 RPM, so gear it appropriately. 4-53T takes up about same room as 6bt Cummins.

Ed in CO
 
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