My 1985 GMC S-15 pick-up is in MINT condition, and I really love that little truck, but it has become a HUGE problem for me....It has a recently re-built (15k miles) 2.8 liter V-6 in it, that started leaking oil from the weep hole in the torque converter cover. I pulled the transmission, which was rebuilt at the same time, and could not find any way to replace the rear main seal from the back of the engine. I bought a "Chilton's" book for the truck, and it says to remove the engine, #4 bearing cap, and the oil pump to replace the 2 piece rear main seal. We rented a cherry picker, and borrowed an engine stand, and pulled the engine last weekend...replaced the rear main seal, oil pan gasket, intake gaskets, and both valve cover gaskets.. We put the engine back in, and I've got her running pretty good, but the oil is REALLY pissing out now, from the same weep hole....Just very frustrated with the thing now, and not sure what to do with it.....Im hearing that a 4.3 liter V-6 is an ideal replacement engine, but not sure if my transmission will mount up to a 4.3... Will I have to have another transmission as well? OR, should I just pull the engine again, and try another seal? I AM sure the oil is coming from there, as it is dry from the torque converter up, and the cover was FULL of oil....Im thinking if I pull it, I may as well put a better, stronger engine in there....STILL beats a new truck payment! ANYONE know where I can get a good 4.3 V6 in the Atlanta Georgia area?