318 rear main seal replacement

While you have the valve body out,, there's also a small seal inside the piece that protrudes out the trans case,, it seals between the throttle pressure lever shaft and the outer piece.. It's often overlooked,, and you might as well change it too..

Same with the speedo gear,, along with the O-ring,, there a small seal that fits between the gear and the gear holder,, change it while its out..

I usually use a small slide hammer poked up thru the hole, with a nut and washer.. a bolt, and spacer would work..

I've also found it helpful to take the seal to a grinder, and put a small chamfer on the starting edge, and use a little sealer on it....

hope it helps..