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Hey, thank you for posting an update on your van. I recall seeing your old posts and a video where you drove the van . Anyhow, I was planing on swapping mine as well and I wanted to try to keep the automatic pcm in place. After much research, it seems that it would require a simulation of the tcm to work properly. In theory, this is what has to be done 1. simulate the transmission codes on the canbus network 2. simulate the transmission switches output to the pcm (ground switches that indicate in what gear the trans is) 3. simulate sensors of the transmission Here is what I had done: - logged the communication of the canbus network - retrieved (not confirmed yet) the automatic transmission gear codes - basic research on usage of the pcm pins canbus analysis On the canbus network, the automatic transmission gear codes id is x230 and here is the data for each gear. When the van is off and the shifter goes through all gears, here is the data that I get: park : 00 64 D3 00 00 00 00 reverse : E1 08 D3 00 00 00 00 neutral : 00 64 D3 00 00 00 00 drive : 11 19 D3 00 00 00 00 first : 20 95 D3 00 00 00 00 second : 11 19 D3 00 00 00 00 (But I'd have to check again the park and neutral codes as they seem the same) pcm pins These transmission gear codes correspond to the 7 switch pins (pins 8,13,14,20,30,35 and 41) on the PCM. Aside from that, there are a couple of pins that would require simulation - 4 sensors (pins 10,19,29 and 37) - 6 solenoids (pins 23,33,43,44,45 and 50 but pin 11 and 15 could be deleted) - 2 other pins (could be ground or power control) (pins 43 and 50) So, simulating the transmission in order to fool the pcm would be a bit time consuming. The temperature sensors would not be all that bad, but simulating speed and matching gears could be a little bit tricky and would end up messing some PID's. At best, we might get final drive ratio error codes, but worst case PID's would be very off and throwing a bunch of codes (ABS, Transmission, Gear ratio...) Plus, using the manual tune with the proper wiring is a plus as the pcm uses the clutch switch to adjust fuel/air ratio depending of engine load. (Source for pcm pins and clutch switch : workshop manual) Anyhow, I hope the canbus codes could be hopeful for anyone that wants to keep the auto tune. Props to converting yours to manual! Note : that is all that I will to for the manual swap as I am getting rid of my van due to the engine going bad