The engine I just pulled out of my blazer had a auto behind it. The engine I am putting in, had a four speed behind it so it has the pilot bushing in the back of the crank. If I take that out I'll be good to go right? How does it come out? special puller...or? I was gonna replace the rear main seal while it was out, but its not leaking at all....probably one of those things..'if its not broken, dont fix it'? Its from an '89 so it does NOT have the one piece rear main, otherwise I'd just swap it out real quick. Thanks!