[BillyJack]

I have to speak in generalities here, since there's a zillion different variations of shift kits on the market and everyone does things a little different. On most shift kits, the "towing" calibration is the best setting for a bit more performance and trans temp reduction in a street-driven vehicle. The shift points are raised and shift firmness is increased over the stock settings. The alternate setting is usually some variation of a "street/strip" calibration, which elevates the shift points even higher and snaps your neck with super-firm shifts, usually very uncomfortable for normal light to medium throttle street operation.

Bill