Gear change on 91 cummins rear end - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 10-06-2012, 02:58 AM Thread Starter
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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.

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post #2 of 3 Old 10-06-2012, 10:34 PM
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Yes the ring and pinion will be a different size. you have to shim the pinion and shim the carrier. You have to know what you are doing.

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post #3 of 3 Old 10-07-2012, 12:05 AM Thread Starter
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Ive changed truck rear end gears and car rear end gears for same size so I remember that part of checking the play and adding shims. I found some stuff on doing ratio changes as well as talking to my shops master tech. Thanks Bushwaker for the input.

2008 6.4l F250 ECSB XLT 4x4
American Racing Wheels w/ 33" hankook dynapro a/t
Mini maxx tuner, dpf delete, s&b intake, warn front bumper and warn 12000 lbs winch.

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