I have nearly 15 thousand miles running a 7427 on a 4l80E manufactured in 1990 (1991 model year) without a single issue, and thats on top of 78,000+ miles the trans ran on a 7060. I had to tune the force motor current tables to get the pressure in line with what was commanded but it didn't take much. If I had it to do over I would have thrown the 7060 in the trash from the start.
Bookmarks