I have a 90 W250
Banks stinger kit, BD fuel pin, 3200 rpm spring, pump turned up 2 turns est hp and tq around 285/600
tranny is not letting me get all the power to the ground, will a Transgo TD-FOD reprogram kit be enough?

 

Most guys with autos talk about upgrading to a 'tighter' torque converter.

Also, larger tires and stock axle ratio make it harder to put down the power.