IN10CITY

I recently swapped the motor, harness and computer from a 92 loyale (N/A) into my 87 GL-10 turbo wagon. I totally cleaned and resealed the engine before it went in, but now apparently, it has rejected it's new rear main seal. It runs and drives like a dream, but is now losing a little bit of oil. Any suggestions on the easiest way to get back to the seal. Would it be easier to slide the tranny (5 spd) back out of the way, or should I pop the motor out again? Thanks for any input... Cheers!