Special tunes for tires and gears
 

So is there a special tune cause i have 37'' and stock 3:73 gears. would stock tunes affect this any. Cause my truck doest like to down shift espically with any weight behind it

The tunes would require a bit of modification to get the shift points back to stock. The biggest issue with stock tuning is the need to have the accelerator just about pinned to force a downshift.

Our tow programs will force a downshift with less accelerator pedal input than stock.