Hello, I just bought a rebuilt transmission with a 2 year warranty and a new torque converter just had it installed a few weeks ago. There has been a hard shift from 1-2, I talked to the transmission dealer and he told me that this was common and should stop after 2000 miles. The other day the check engine light came on. We had it tested and P1870 Trans Component Slipping was the code. The fluid levels are fine. Should I return the transmission or is there something else I can do? Also it feels like its in 4wd but its not. Its a 2000 chevy silverado 1500 V8 4L60 E transmission. Thank you for any help you can give!!!