Just swap the bell housings. The trans itself is still a RE7R01A-there are differences in gear ratio’s-see attached. Only reason that you would have to swap valve body’s that have the TCM integrated would be due the logic for ECM mapping or for some reason the VR 7speed TCM software has some discord with the 3.7 ECM-though that shouldn’t be the case since the 3.7 has the same internals as a VR 7 speed. Looking at the wiring diagrams for both-only difference is the 3.7 uses pin 4 for ‘k’ line to the DLC. See attached pics. Also side note... a long time ago when the 3.0 first came out I wanted to see if a 6speed mated up with a clutch installed, and it sure did just crank position sensor holes were off.
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‘08 coupe w/Stillen SC, Custom A2A, SD, ID1050x, e85, eagle rods, high temp coated pistons, P&P heads, JWT C2, manual swap, stage 2 clutch. EcuTek(Eugene)
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