Thank you for this information. A statement was made in another thread by someone who I don't think had the winch mount saying it does not work with the stock fan configuration.
From what I see in the '81-'86 & '86-87 Parts manuals 3.73 were not offered in MJs.
Manuals can be downloaded in this thread (the '86-87 manual was a hard copy that I PDF'd)
Yes sir, those are my fingers in the picture. I'll see if my brother can scan and 3D print a couple, but he is busy with the tailgate strap bumpers at the moment.
Was that it? What did your REM show for O2 voltage? It should cycle from low values to high values (~0.2-5.0) very quickly and one of the displays should toggle between Lean and Rich, also very quickly.