Help: Newbie, but learning quick on 87 LXI Tranny Engine swap to 89 LXI

[CruzenNC]

:) Could someone tell me the gotchas on a 87 LXI to 89 LXI engine/tranny sway. Both AUTOMATIC, I would imagine direct engine bolt on swap, do I have to do something with wiring harnesses.

General info would be nice, specifics even better.

Thanks