Rear main seal on a 92 s10blazer 4.3 V6

I was driving home and started to smell oil. I drove it straight home and parked, got out and there was a steady drip for a while then quit. The motor runs fine. My question is if it is the main seal and if it is will I have to pull the motor or can I drop the tranny and exaust manifolds instead. It shows it as a one piece on orileys websiteare these hard to replace.

PS this has happened on every car ive owned.

71 superbeattle
89 nissan truck
98 honda civic lx
95 nissan 200sx
89 ford fiestiva
and now my blazer

i do not beat on my vehicles either. And change the oil with the right amount each time.