Spec Smart: Don’t know your gear split chart from your rear axle ratio? Read our primer on medium-duty truck spec’ing. by trucknews.com December 22, 2006. You run a handful of medium-duty trucks to ...

Vehicle speed (mph), engine speed (rpm), tire diameter (inches), trans gear ratio, and rear axle gear ratio are all interrelated. If you know four out of five of these values, you can determine ...

Building a rear end capable of withstanding 800 horsepower and 6,000-rpm clutch drops with slicks is certainly no disadvantage, ... is a standard 8.2 3.55 gear ratio that is made of 8620 steel.