Join Date: Nov 2008
broncosbybart is offline
Re: How to replace rear main seal in 4.3
the best way to do it is to remove the oil pan and take the rear main off. chances are that it will leak if you do it as described. you could try it and it wouldn't hurt if you did, but it would probably still leak. what i do is take it all apart and place some rtv on the outer surface of the rear main seal. i will also put a line of weatherstripping adhesive on the outer edge of the block to provide a seal between the block and rear main. that way there are 0 leaks when you put it all together, as long as you do a good job w/the oil pan gasket. I use rtv on the cork and in the corners where the rubber c-shaped gaskets sit.