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Gear change on 91 cummins rear end
My buddy asked me to swap out his rear end gear ratio on his 91 cummins from 4.10s to 3.54s. I know how to replace gears but I haven't done a ratio swap. I was wondering if any of y'all knew what's needed to change the ratio. I've heard that you would need shims when down sizing but I'm not a 100% sure if that's true any input would be great.
2008 6.4l F250 ECSB XLT 4x4
American Racing Wheels w/ 33" Toyo Open Country a/t2
Mini maxx tuner, dpf delete, s&b intake, fab four front bumper and warn 12000 lbs winch.
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