1994 4L60E to 1993 NV4500?

[Manimal]

ok, so I have decided I am going to swap in my NV4500 from my 93 k3500 into my 94 Yukon k1500. I am going to use the tranfer case and all from the 3500. I have questions about the wiring and ECM. I have the EMC from the K3500. Do I have to change the entire harness? What about the A/C? the k3500 did not have it, the Yukon does. It appears to run through the firewall in the same spot under the overflow. Does that pass-through come apart to get the A/C wires out? Or can I just eliminate the transmission wiring from my existing harness and use the 3500 ECM or get an ECM for a 94 with a manual trans?
Thank You

 

[Frank Enstein]

The computer may need a new custom chip but you shouldn't need the other harness. For goodness sake don't throw away anything until you have 1000 miles on the new combo! Anything thrown away will be immediately needed and be 3 months back-ordered!