Thread: New transmission not working correct - possible PCM issue?

Stock slippage is about 15-30RPMs at cruising speed, right? (that's how much I see with the stock tune)

The pcm wants to see between 2 and 50 rpm of slippage so your numbers are right in line. Without a graphing scanner or scope it is near impossible to see the real time variations and the averare is normally where it rides in between the two values.