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I not sure what your using the truck for but 4.17 with a mack 13 speed and low pro 24.5 will get you 80 mph at 1900, in the ch I ran, so the eaton 18 speed would be about 2100 at 80 I thank with low pro 24.5, I belive the mack tranny has a bigger overdrive than the eaton.

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