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Re: 10 bolt to 12 bolt swap
The 12 bolt has a carrier break between 3.42:1 and 3.73:1, so you won't be able to use the eaton posi with 3.73 gears. That's another area where the 10 bolt is better. There is no carrier break for the 8.5.
Mike
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1986 SWB "Jolene" boosted 5.3/4l80e project
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