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gear ratio road speed


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Looking at a RD 688,1999 460MACK,fuller 8LL 11:24.5 tall rubber the guy tells me the rear end ratio is a 4.73? I'm thinking it's a 4.78 Mack rear.My Eaton road speed calculator tells me at 1600 rpm the truck will be running 58mph.The guy tells me it runs 70mph 1700rpm.I need a local truck but it need to run at least 68mph in the sweet spot.

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