Remove crossmember, starter, oilpan. Loosen all main bearing cap bolts and loosen the caps to allow crank to drop down a tiny bit. Lube the new seal. Apply rtv only at the edge of the rear cap. If you buy fel pro rear main seal it will come with instructions. Did I mention oiling the part of the crank that touches the seal so that the seal doesnt run dry to begin with?

Tim

84 CJ7, 258, HEI, M/C 2100 carb, 5 inch lift, RS9000's, 33x12.5 BFG M/T's, 4.56's and Detroit softlocker, full cage & belts, Xenon flares, Dana 44 rear, GM dual diaphragm brake booster