I’m sorry I forgot to mention on the 2nd rebuild he gave me a completely different 4l60e transmission this one isn’t throwing out the p1870 code. That’s why he suggested a new Ecu
I have a 1998 Chevy Silverado c1500 with the 305 engine and a 4l60e. About 2 my check engine came on saying “transmission component slipping.” I decided to take it to my mechanic and he told me I needed a rebuild after the rebuild the transmission worked okay except that when I would floor it...