Wayne , checking power is not doing us any good..does it slip always? Yes no power is max line. You are right on the year of EPC change.. What does your Tap psi look like? Should start in the 20 'a and by half way be 0 .. Also what is shift duration?? The code will set if you have 3 continues shifts of over .6 seconds.. Also have bought a factory drum before ( loaded ) 2nd drum and to much clearance.

Joe Regnere Jr
Technician
Lake City Transmission
Hayden, Idaho, USA