I recently had my R154 transmission rebuilt with a new 1st gear, hub and thrust washer (slipping out of 1st gear). I reinstalled the transmission in my car and drove it easy for about 500 miles. While accelerating hard in 2nd gear, I heard a squealing noise from the transmission and it now appears I broke it again, since the transmission is slipping out of 1st gear again. The transmission shop that rebuilt the transmission doesn’t know why it broke again so soon. I am using a RPS 3200 lb puck clutch putting out 410 hp and 390 ft-lb of torque at the rear wheels. Can you give me some direction on this problem? Do you rebuild these transmissions? Thanks for any help you can offer.