Don't waste your money on this POS. It is useless the 7.5 amp one always goes on sale for $49,$59, $79 or $99 depending on their mood.I bought the 3.5Amp a few years ago, returned it the next day, useless.
Do you use the impact wrench to tighten the nuts at the wheel?It maybe too much torque, if it is capable pumping 220lb/ftIf not what did you use to tighten the nuts?