I am not trying to hi-jack this posting but have a related question that may go along with the original question.

I am also thinking about upping my rear end ratio to Pratric's 3:55 set of gears. What affect would this change have on a 58 1/2 ton with a stock I-6 235 and 3 speed? Would changing the rear gears lower the the engine RPM so much that I would be below the HP and Torque ranges thereby increasing down shifting or having to run up RPM to produce the needed power and toque before up shifting, thereby negating any savings on either wear or fuel use? I would be doing mostly stop and go on local streets.

Thanks,

Bob

Last edited by JD Bob; 12/31/2011 5:29 PM.