2005 GTO converted from M6 to 4L80e using a A4 donor harness, T42 and the car flashed to A4 using Tech2. Built 4L80 with Yank SC3000. Car was recently at the local speed shop and strapped to their Dyno Dynamics. Made 680rwhp and 1000 torque. But they can not get the converter to lockup on the dyno and the car blows through the converter at 5200rpms and falls on it's nose.
Is there a trick to programming the converter to lockup on the dyno? They tried everything they could think of. Car runs great on the street with no signs of any issues.