What are some simple and clear tests I can do to determine / convince someone they need to build trans?
Please don't take this question the wrong way, I need to relay this info to an alleged Allison builder that is giving my customer contradictory info.
The truck is an 06 LLY with high mileage. It shifted sloppier than usual on the stock test drive, and when a good 100 hp tune was flashed it slipped bad and did not learn in several days. He took it to a shady trans. shop and they told him there was no need to overhaul it and also that the "special code from the trans. was not removed by the tuner to enable the engine tune" - not going to comment on that LMMFAO...
Not sure if they mean TAPS or TCM tuning but neither applies to this... anyway,
Common sense tells me the trans. is old and worn and he needs to upgrade the TC and clutches or better have a COMPETENT tech install a fully built unit.
What definitive diagnostic tests can we perform to silence the guy that says a 150k mile truck that can't hold a known good 400 hp tune and is slower stock than other similar trucks doesn't need tranny work?
I am thinking maybe
-monitor slip PID
-look for P7xx codes or limp
-send oil sample to lab??
-stall test???
-anything else????
THANKS!