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Rear Diff. Ratio's

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Well after much wire brushing and examining and a call to Watt's Mack i now know i got 7.00 to 1.0 gear ratio in my Mack which would be fine if this was going to be a Mack dozer or track loader. lol if anybody has any ideas on raising my top speed with out a rear gear change over let me know, Now i know why the old guy that used to drive this always complained about the top speed. Does anybody out there have 4.75 to 5.50 gears for this, Its got the CRD92/CRD93 rears. are they hard to swap, never done mack rears before.

Any ideas? E.S.D. :unsure:

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