How to Grease the Slip Yoke

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by FergusonT, Apr 19, 2012.

  1. FergusonT

    FergusonT New Member

    Anybody tell me how to grease the slip yoke on a '99 Silverado Z71? It has the infamous clunk and I don't think I am going to drop the cash for the nickel plated upgrade. From what I have read on this forum and others, greasing the yoke temporarily stops the clunk.

    Does the yoke have grease fittings?
  2. Untouchable

    Untouchable New Member

    It should have a fitting for you to grease it on the drive shaft pretty close to the U-joint if I'm not mistaken. If not, you could always tap a fitting in there.
  3. FergusonT

    FergusonT New Member

    Somebody told me to pull it out and you can fill the inside of it.
  4. Pikey

    Pikey Moderator

    MY yukon was doing the same thing. I pulled the drive shaft and greased the inside of the slip yoke very well. It has no made noise in 2 months.
  5. billnorman

    billnorman New Member

    More GM bad design and dealer cover-up. took mine back when it was new the dealer said "It didn't do it when we drove it".. Unmitigated B.S. It still does it when it feels like it.
  6. dedmon27

    dedmon27 New Member

    I don't think I would grease the inside of the slip yoke if it is internal, or it slips inside the Transmission (2wd), or Transfer case (4wd). But if it does have a slip yoke grease fitting that would be fine. The grease will break down inside the Tranny and would clog passages. T case might not hurt anything but you never know. Check the universals espesially the rear one.
  7. FergusonT

    FergusonT New Member

    All good thoughts, still have yet to climb underneath and check it out...man its an annoying clunk...

    Also though I am noticing a similar clunk when I come to a stop, right when I let off the brakes just before I come to the complete stop. If I just let it roll at idle speed and slam the brakes, the truck rocks forward and backward and I get the same clunk. My initial thought when I test drove the truck was that the bed was loose....All the suspension bolts seems to be secured, as I have checked that out. Maybe a mount of some sort, tranny/t case....something like that...any thoughts? Maybe the clunks are the same.
  8. ChevyHD

    ChevyHD New Member

    Sounds like your clunk may be some slack in your drivetrain? I'd definitely start out by grabbin' on to your driveshaft and see if you can twist it yourself. If not, my did something similar before throwing the t case. Only difference is mine would do it at the beginning of acceleration too. If you don't feel and slack though, pump your zerks up and see if it makes a difference.
  9. FergusonT

    FergusonT New Member

    I have slack on the shaft between the trans and tcase, maybe a quarter inch.
  10. rileyjr16

    rileyjr16 New Member

    I just pulled my driveshaft and greased the inside of the yoke. Noticed a bit of metal shavings on the splines of the transfer case. Still clunks since I ran out of axle grease so I'll probably buy some more and put some more in there.
  11. Jimmeh

    Jimmeh New Member

    I agree on not greasing that slip yoke by removing it from the transmission. I am also pretty sure that there is not a grease fitting on the u-joint since I just looked at mine last Thursday and couldn't find one. I also have an aluminum drive shaft, though and not exactly sure if that was stock or not.

    I noticed mine will only clunk if I take it really easy away from stop signs or lights. I still take it easy, but I do goose it a little and it doesn't clunk. Mine will also clunk if I go from having a load on the engine (IE: giving it the beans) to letting off and braking immediately.
  12. shibby2oo8

    shibby2oo8 New Member

    This is mostly on the ext cab short bed 4x4's with the aluminum driveshaft. I had the same prob and tried greasing it with all kinds of stuff. Sure it will go away for a month or 2 but it will come back. Brokedown and dished out the 250$ for a nikel yoke. 4 years now no probs. there are no grease fittings on factory equipment, i always get the hd joints from napa with the fittings but even then the fittings are almost impossable to get to with the truck on the ground so i pull the shaft every summer and grease them up.
  13. Jimmeh

    Jimmeh New Member

    So yesterday, I was backing out of my spot in front of the garage, and when I put the truck in reverse, it hesitated, then felt like it slipped with a bit of a pop. Definitely thinking it's that slip yoke. Transmission works great in every gear but that has happened with reverse a couple of times now.
  14. FergusonT

    FergusonT New Member

    Yeap, I get a "clink" in reverse almost every time....so Shibby, you said you paid $250 for the yoke...seems like I read or heard that it was more expensive. Thats not bad.
  15. shibby2oo8

    shibby2oo8 New Member

    It was in 09 and i was still working in the shop then so i got a small discount. They were around $450 when the TSB first came out but they have come down. List was only like 40$ off what i paid but agian this is 3 years ago.

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