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IC, I bet the 4R70W uses different solenoid packs and wiring to?
When I said everything, I meant everything, and they don't even look alike, other than the torque converter sitting in the front, and the output shaft sticks out the back.
Solenoid pack and computer, no doubt, but wiring I don't know about, but would bet they are different as well.
The C6 and C4 are more alike than the 4R70W and the 4R100, and they (C4 and the C6) are totaly different.