Recently swapped to a 4l80e from the 60e in my ’08 Sierra. Using the tuned by frost conversion harness which doesn’t require a segment swap and allows for full converter lockup (pending the 60segment will allow). As part of the codes and fields required to be modified are the {E0804} Slipping Trans Min Temp. Steve states the E0804 must be maxed out to disable the slip test and without the test being disabled the harness will not work. Unfortunately I’m not seeing the Slipping Test under Transmission Diagnostics for my T42 or any of the T42’s on the tune file depot.

Instructions:
Max out Trans Component Diagnostic Enable Temp in Trans Diag Tab
Ignore front VSS sensor (leave unplugged) and disable input speed sensor (if applicable)

Had I known the modifications needed aren’t listed in Efilive I wouldn’t have purchased and installed the harness. Has anyone had any luck using the Frost harness and Efilive? Or know how to make it work?