Originally Posted by WhitH
I ran a light tune in my 6.0 on 33 inch tires and 4.10 gearing. To me the seat of the pants feel was great and it pulled grades very nicely. RPMs got a little high on the highway at anything over 70 which hurt fuel economy but...I would expect great economy over 60-65 anyway. I should also add that my rig weighed right at 8,000 lbs.
I would think that a 4.10 on 35s would be just about right but you may want to throw out if you are going to be running any more power over stock and your weight for more feedback. There are charts out there where you can determine RPMs at speeds with tire size and gearing factored in.
With 3.73 I'm hoping to get decent Highway MPG. Weight wise my van will be basic, 2 passengers, 2 dogs, One bench/ bed seat, 4x4 conversion stuff. Not sure what the combined weight will be with that setup. Also I'm weary of running tunes because my engine is stock (no studs). What tunes were you running?
I have already bought axles for 4x4 swap with 3.73, one of the reason was because I didn't see newer Dana 60 axles with 4.10 gears.