Hello folks. Ok first off i will explain what my customer was in countering with his 4l60e trans. He lost third and forth. Ok simple enough tear the trans down and replace clutches and pump. No big deal right?? Well 3 rd and 4th clutch pack was complete toast. The frictions had no teeth left. So i rebuilt the whole drum. New sillanoids. Everything new from front to back. The trans will do 1st and 2nd beautiful but will not do third on its own??? I can manually shift it and its fine until it wont go into 4th??? I have dropped this trans 3 damn times to double check all my work and everything is up to spec. I am so damn lost someone please help me. Also to. We have a tps code on the intake and an oil pressure sensor. Thanks in advance. I have been in mechanics for 13 yrs and never ran into the same issue that was going on before, still happening after a complete rebuild.