Crank Shaft Oil Seal

 

I did replace the seal with the engine in place. Did not come out well. I used the Best seal. My crank was worn too much for it to work. The leak was worse than the seal I had. I tried a Crown seal and the fit was horrible. I used a two piece seal, sorry I don't recall the brand, that resembled the original seal and tolerated it until rebuild.

 

You didn't mention what engine and year you have. That may help with identifying which seal you may have.

 

Do a search on rear main seal replacement. There's a lot of info available.

I have changed rear main seals without removing the engine, or flywheel, in a number of vehicles. Sometimes it works well, sometimes it can be difficult depending on what sealant may have been used previously. 

Be very careful when you remove the rear main bearing cap. Keep it clean, and try not to disturb the bearing inserts more than to wipe them clean. Lubricate the bearing surfaces on install.

The L134 engine would have had a rope type seal originally, but a good quality modern seal is easier to install with the engine in the vehicle.

I haven't bought a lot of parts from Joes Motor Pool, but what I have were of good quality.

They list the rear main seal at a reasonable price.