After doing some more research on this, I found out that installing a 6L80 6spd auto in our cars is possible and not quite as complicated as I thought. Just got off the phone with Jim@Zero Gravity Performance in Phoenix. Zero Gravity sells everything needed for the installation, from individual parts to a turn-key kit. If I decide to do it, I will have my trans shop supply the transmission and just purchase the stand-alone controller, TPS, and other misc parts needed, from Zero Gravity.
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