I'm pitching the 4l60E for a th400. From what I understand, the PCM will think the trans is in park as no electronics are connected and not use the correct timing tables. My current tune was done on a dyno and is dead on, and I'd like to keep it (not reflash to m6 program).

What are my options? I do not have tuning software yet, but will buy it if I have to (as a last resort as I'm trying to keep costs down).

 

ttt
any suggestions?