I am using an A40 TCM from a 2006, Chevy 8.1L, with an Allison 6-speed. When viewing the tune file, the shift parameters are TPS/MPH, or TPS/RPM, etc. It is my understanding that the 8.1L TCM does NOT 'see' TPS, but rather it gets calculated torque from the 8.1 ECM. My problem is: If the value being sent to the TCM is engine torque, how can a person make intelligent adjustments to shift points that are TPS/x based? Shouldn't it be Engine Torque/RPM, or Engine Torque/MPH? I have no way of knowing what, for example, 75% TPS equates to in engine torque.

I searched the forum for several hours looking for info on this, but came up with nothing related.

Anyone have any experience with this setup?