There are several sizes of ROCKWELL axles. The GM HD 3500 uses one type. The Rockwell i'm considering is about the same as the axle i'm currently running,but a little stronger. 

Bert i remeber when you were in the stock class. :-lafOriginally posted by Excessive Force
Matt, Ya gotta love the "GRAY AREA" of the rules. It was really fun when i ran in the "STOCK" class. :-laf