New Member with a Question about a leak in the 4wd

[jordanrx]

Hi Everyone. I'm 15 and this is my 1980 K20, standard transmission, that I bought from my uncle and look to drive when I turn 16. I noticed a leak from the 4wd and was hoping to get some help identifying what part/seal I need and maybe an idea of what it would take to replace it. I have attached a couple of pictures, one of the truck and one of the leak, that may help.

Thanks in adavance
Will

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[legopnuematic]

Welcome from Missouri.

Looks to be leaking at the pinion seal, without disassembly hard to say if it only needs a seal, seal and speedi sleeve on yoke, or a new seal and yoke.

If you are lucky it could be as simple as a clogged vent/hose causing it to build pressure, pinion seals are not really made for holding against pressure, it's lot of times the path of least resistance.

 

[dvdswan]

Welcome to the site. Nice purchase from your uncle. It does look like a pinion seal, but be careful, engine oil leaks can drip down onto the front axle.

I would buy some Gunk engine degreaser and spray the engine and front axle. (be careful not to soak electrical connections or distributor with high pressure water, You'll have a real hard time starting the truck up again for a long while.) Then drive around for a bit (10-15 minutes should be more than enough) then check for leaks again.

The rear of the intake, valve covers, oil sender, oil pan, and rear main seal are key spots to look for leaks. Unless, the front hubs have been locked forever I really doubt it's the pinion seal leaking.