How hard is it to replace rear main seal on the P37 chassis?

[fgutie35]

I have an Elandan 28EU with the P37 chassis. Has anybody replaced the rear main seal? So far from the dog house, it looks very accessible to remove the bell housing, drop the shaft from the mid bearing and move the tranny back, but I don't know what kind of surprises I'm going to encounter.

[Oz]

Still need some input on this one, gang!

You may want to give Winnebago a call and see if it uses a single piece or two piece seal and if it requires a special tool or if you can still get it in there without that tool.

[DanielTBolger]

One piece seal:  Remove the transmission and fly wheel.
Two piece seal:  Remove the oil pan and rear mail cape.

They're easy.  You just have to have a good transmission jack.

The tool for the two piece gasket is a finger lock look thing (spanner wrench?).

You roll the seal around the crank.

I found that, if you pull a spark plug out & turn the crank, it's easier.  Why pull the seal around the crank when you can hold the seal in place and seat it by turning the crank.  This reduces the chances of damaging the seal and not seating it properly.

[fgutie35]

Thanks! that will be my winter project.

[BrianB]

So, I have a rear main seal that is leaking. Since the whole rig only has 27K original miles on it, I assume it is just from sitting and the rubber drying up.

When I started looking (and saw this thread), there was mention of a 1-piece seal. Since my last experience with Chevy V8 engines was with early-to-late 70's vehicles, this was news to me.

All the websites I could find were geared towards the small-block engine and say that the changeover was in 1986. However, I came across this graphic which is specific to the 454, and it looks as if the changeover was 1991.

Hope this information helps someone down the road.

[SLEETH]

should be a 2 piece seal