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Re: 72 suburban with a duramax (the build)
will you be running a allison 5 or 6 speed? my tire size is around 31in tall. I think you will find the 3.00 gear to be to tall. my burb wouldnt shift to 6th untill around 62mph with the 3:08 gear now with the 3:55 i am around 1800 rpm @ 65mph. i never gave up any mileage when i changed rear ends.
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