1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

GMT900 Slip Yoke Lubrication

Discussion in 'Lubrication & Maintenance' started by Zembonez, Oct 18, 2009.

  1. Zembonez

    Zembonez I hate black wheels...

    Posts:
    58,098
    Likes Received:
    26
    Joined:
    May 17, 2009
    Pulled the driveshaft today and greased the slip yoke. What a difference! Takeoffs are smoother than ever... It's hard to believe how such a small thing can make a difference.

    Walk through:

    FIRST. Set the parking brake. Once the driveshaft is removed, the truck can roll even when in Park... and it will!

    Make sure to mark the driveshaft, U joint, & rear end so that you know everything goes back together exactly
    as it came apart for the sake of maintaining balance. A simple china marker works well.

    [​IMG]

    Here is the front with the slip yoke still installed in the trans.

    [​IMG]

    Remove the 4 U joint retaining bolts. Tap the shaft at the U joint with a dead blow hammer to dislodge.
    Slip the driveshaft forward until the U joint clears and then slide it rearward out of the transmission.

    NOTE:
    USE CAUTION to prevent the 2 exposed U joint caps from falling off. Some people like to wrap tape
    around the joint to keep the caps on. Mine were not trying to fall off, but there isn't anything (except
    the grease in them) keeping them in place when the shaft is removed.

    [​IMG]

    Trans will not leak fluid as long as vehicle is level.

    [​IMG]

    Yoke after removal. Notice how much surface rust is on the exposed part of the yoke after two years.

    [​IMG]

    Take a scotch pad to the exposed portion and remove the surface rust.

    [​IMG]

    After smoothing it, there is an obvious improvement in the yoke. This step is NOT totally necessary, but this is where
    the yoke goes through the rubber dust boot on the trans tailshaft, so I like to make it smooth again.

    [​IMG]

    After cleaning out the OEM grease, I lube the inner splines using Marine grade wheel bearing grease. This product has
    proven to be an unbeatable lubricant for this purpose over time. I've used it on several trucks.

    [​IMG]

    Nothing beats a good old finger when it comes to smoothing the grease out in the splines.

    [​IMG]

    Installation is the reverse of removal. Just make sure that you align your marks so that everything goes back together as it was.

    Headed off on a test drive after about 15 minutes of work!

    [​IMG]
     
  2. CJ Hungus

    CJ Hungus Moderator

    Age:
    34
    Posts:
    25,544
    Likes Received:
    0
    Joined:
    May 31, 2009
    Location:
    Ham Lake, MN
    :thumbs: I'll be doing this tomorrow! Great write up Jim
     
  3. Bowtie2Sierra

    Bowtie2Sierra ?

    Posts:
    3,049
    Likes Received:
    0
    Joined:
    May 25, 2009
    Location:
    Bentonville
    Thanks for the write up. I always wanted to grease the slip yoke on mine as well. However, I'm a dummy when it comes to transmissions and I had no clue what the slip yoke was or what it entailed to grease the splines. I have a better idea of what I'm looking for now thanks to your write up. :thumbs:
     
  4. CJ Hungus

    CJ Hungus Moderator

    Age:
    34
    Posts:
    25,544
    Likes Received:
    0
    Joined:
    May 31, 2009
    Location:
    Ham Lake, MN
    Exactly.... to this day there has never (that I know of) been a good solid write up on greasing the slip yolk. It was always... just pull the driveshaft out and gease the slip yolk. That doesn't help me :dunce: much
     
  5. Zembonez

    Zembonez I hate black wheels...

    Posts:
    58,098
    Likes Received:
    26
    Joined:
    May 17, 2009
    It's easy guys. Just MAKE SURE you mark the driveshaft and don't rotate anything while it's out. Install it the same way it came out and it's a snap!
     
  6. CJ Hungus

    CJ Hungus Moderator

    Age:
    34
    Posts:
    25,544
    Likes Received:
    0
    Joined:
    May 31, 2009
    Location:
    Ham Lake, MN
    Well now that we have this write up, it should be a snap! What brand of wheel bearing grease do you use?
     
  7. Zembonez

    Zembonez I hate black wheels...

    Posts:
    58,098
    Likes Received:
    26
    Joined:
    May 17, 2009
    I use Marine grade wheel bearing grease like a boat trailer would use. I figure if it's good enough for being used in submerged wheel bearings, it should be fine on the slip yoke. I've used it on my trucks since my 2001 came down with the slip yoke bump problem. I'm sure any car part store or even a Walmart type store would have it.
     
  8. ryan_h

    ryan_h Sofa King We Todd Did

    Posts:
    475
    Likes Received:
    0
    Joined:
    May 25, 2009
    Location:
    Renton, WA
    If you don't jack your truck up make sure you BLOCK YOUR TIRES.
     
  9. Zembonez

    Zembonez I hate black wheels...

    Posts:
    58,098
    Likes Received:
    26
    Joined:
    May 17, 2009
    +1

    AND SET THE BRAKE FOR SURE!
     
  10. daddy

    daddy Administrator

    Posts:
    47,361
    Likes Received:
    21
    Joined:
    May 17, 2009
    Location:
    Pawnee, IN
    You need more cars. :D



    Nice write-up.
     

Share This Page