hey guys I have a rear engine seal leak and wondering what you guys have done or any tips or tricks for it. seems like its going to be a hefty repair bill

 

first check to see if the leak is coming from the oil cooler line block above the oil filter that sometimes looks like its a rear main issue. you can also pop the transmission inspection window and look to see if the rear seal is leaking. it can also be dripping from above the engine down.

 

I had mine done while getting the transmission rebuilt. That's the labor intensive part. I don't know how or if it can be done without a lift. The trans and transfer case are heavy.

Tim

 

a friend of mine did not my rear main seals without a lift. Just need enough room unde truck to remove transmission and exhaust.

 

moat likely it’s the rear main seal. All of them leak even with 50miles on it. Prob due to age too. Gaskets here old and brittle

 

Not all of them leak!
They leak due to user error.
Just keep that engine oil clean and use a quality synthetic fluid and properly maintain the engine.
If you had a rear main seal leak you can find out why here: prevent rear main seal leak

 

hmm odd because ive always run the castrol edge or the dexos from the gm dealership, recently switched to amsoil and castrol full synthetic. truck has mostly city km so maybe thats why

 

You’re wrong. I bought my truck with 24k miles on it. I always babied it. At around 80k the rear main seal was starting to sweat. So instead of waiting for it to start really leaking I changed it out. I got oil changes every 3k miles without fail. These engines are known for rear main seals.

I also have an 08 with 48k mikes and it started to sweat too so I changed that one too and I treat the trucks as if they were my kids.

 

Make sure its the rear seal, pull the inspection cover on the bell housing and verify oil in the bell housing.

The oil lines and the valley cover at the oil pressure sensor are more common and misdiagnosed quite often.

I have to agree with HUMMERZ the seals on the ls engines are far superior than the old GM engines.

Neal

 

Sooner or later you may have to take the plunge and go for it. When I first got my H2 I had a leak that I thought was the rear main. But it actually was the oil pressure sending unit up on the top of the engine close to the rear of the manifold. It was leaking from the core where the wires attach, pooling then running down the back of the engine.

Last month the 4l65 gave up the ghost and started having a flare shift (slipping) on the second to third shift and I replaced the trans. At the same time I replaced the rear engine plate and the oil seal, the plate is known to have warp issues. What ever you do replace both, don't cheap out on this. If its done correctly and you run synthetic oil you more then likely will never have to do it again.