I began to notice a little bit of red ATF on the garage floor, so 3 weeks ago, I pulled the driveshafts and replaced the output shaft seal. So far, so good. Still noticed a little ATF and thought, well, it's the last of the leak dripping down. Yesterday, I noticed that there is still a little bit of fluid there. So, I crawl under the truck and, on close inspection, I find a little ATF seems to be leaking out of the yoke itself. The new seal is doing fine, it's the yoke that seems to be leaking.
Do I need to cough up $$$ for a new slip yoke and U-joint, or is there an easier fix?

 

I've seen trucks (GM and mercedes) leak out of the end of the slip joint, just clean it off good with brake-clean and a rag and coat the "plug" end of the slip joint with RTV and the leak will stop, no need to spend $$ on a new yoke.
you may even be able to replace the "plug" if parts are avaliable

again RTV is your friend

 

Ten-four! Thanks. I'll try some RTV in it.

 

No problem, just put the RTV ON it not IN it.

 

Well, if I put it ON it, it has to go on the splines then where the shaft sticks out of the transmission. Or inside the splined area of the slip-yoke. Otherwise, it's not gonna do any good.

 

NO, you have to coat the end plug between the u-joint and the yoke, (the vertical face) if you coat the splines you stop the yoke from moving in and out of the tranny, it has to move as the suspension moves.
The leak is comming out of the cap or plug end of the yoke so the RTV seals the plug.
I cant explain(type) it, very well but if you PM me your phone # I can call and explain it better

 

OK, no need. I gotcha now. Much easier to do that! Don't havta pull the drive shaft!! Thanks!!

 

Awright... I cleaned the back of the end-plug on the yoke with alcohol and smeared on some Permatex Black RTV sealant. See how it goes.

Thanks for the help!