Hey... As some of you know my truck is at the tranny shop under warranty. I asked them how much they would charge me to replace my rear main seal, since the tranny is already out. They said about $150.00. They said that if my b/f wanted to he could come change it out in the parking lot, while my truck has no tranny in it. Before I ask him to do this, what all is involved? I am already racking up bills on this thing, I don't want to pay that much to get it done. It's a 79 GMC Jimmy with a TH350 tranny, 340 4 bolt engine.