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Re: transmission swap
Stoke
ECM (1227747) controls 700R4 lock-up via three wire interface (white four pin connector), but you'll also need to wire brake pedal switch for TCC release function. It is a very simple two wire circuit.
After market harnesses are nice - wires are higher quality and connectors are not broken. Otherwise you'll need to exercise care when removing harness from '88 donor. BTW if IIRC I used 2-1/8 52mm GreenLee tools hole punch for the firewall though hole (just because I had it around). Worked like a charm.
//RF
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"The Beast"
1975 Chevrolet C20 longbed
350/ 700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29) 
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
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