Drive Shaft Slip Yoke?

[Massfloefi]

Hi Gents,

Been a while. If anyone with experience can chime in about the problem in the video I would appreciate it. Seems to me like a slip bump issue. Need greasing, replacement or super ball trick? Thanks

2005 GMC Yukon XL Denali

 

[Doubeleive]

sounds kind of normal to me for a nbs, is this something that recently became louder?

 

[Massfloefi]

sounds kind of normal to me for a nbs, is this something that recently became louder?

Hey Doubeleive,

Should have elaborated. I have had a clunk on acceleration after releasing the gas pedal and then reapplying at highway speed. Coming to almost a complete stop it happens as well. Seems to be amplified under same conditions if I only use third gear. It's been happening since I've had it. I am about to start towing a travel trailer and wanted to button the truck up. Thanks

 

[Doubeleive]

could be the slip yoke needs to be greased, I would take a look at your universal joints also

 

[Massfloefi]

could be the slip yoke needs to be greased, I would take a look at your universal joints also

If the information is correct ATF fluid is used on 4WD slip yolk? That should also include AWD I would imagine.

 

[Doubeleive]

If the information is correct ATF fluid is used on 4WD slip yolk? That should also include AWD I would imagine.

I don't think the slip yoke would use trans fluid, needs grease, @swathdiver probably knows what it requires

 

[Massfloefi]

I don't think the slip yoke would use trans fluid, needs grease, @swathdiver probably knows what it requires

Quick research I have found is says to use GM 12345996 High Temp Grease. Not readily avail. I would like to get something sooner if possible. Maybe @swathdiver has another recommendation. Thanks

 

[Massfloefi]

So I pulled the slip yoke and seems to be a little damage?

No movement in the u joints that are connected.

 

[mattbta]

This is what my RWD sounded like when the grease was dry while going over speed bumps. You can see the movement in/out by design. Since it's RWD, I greased it up good with Lucas Red & Tacky and hasn't come back in a year. There's a lot of info out there on an updated nickel plated yoke for 4WD.

EDIT: Service Bulletin: http://ww2.justanswer.com/uploads/heavychevy396/2010-01-02_122225_Slip_Yoke.pdf

And more info on 4WD to NOT use grease:

GM Customer Care and Aftersales





*URGENT - DISTRIBUTE IMMEDIATELY*





DATE: November 4, 2010

SUBJECT: Do Not use Slip Yoke Grease from Bulletin #09-04-17-002C on 4WD Vehicles.

MODELS: 2007 – 2009 Chevrolet Silverado 1500 Series



2008 – 2009 Chevrolet Avalanche, Suburban, Tahoe 1500 Series



2007 – 2009 GMC Sierra 1500 Series



2008 – 2009 GMC Yukon, Yukon XL 1500 Series



Equipped with 4WD (RPO NQG, NQH)



TO: Chevrolet/GMC Dealers

ATTN: Service Manager and Parts Manager



A new grease, part # 19257121 (in Canada, 19257122), was recently released for lubrication of slip yoke splines to repair a condition of a bump feel or clunk noise at stop or from launch on the vehicles equipped with 4L60 Automatic Transmission (RPO M30) and 2WD. Please see Bulletin # 09-04-17-002C for details.



Do not use the new grease for lubrication of slip yoke splines on 4WD vehicles. The output shaft in a 4WD transfer case does not have a grease retainer to keep the grease from migrating into the transfer case and mixing with the fluid inside. The new grease is not compatible with the Automatic Transmission fluid used in the transfer case and can cause damage if mixed. Lubricate the splines on 4WD vehicles with Automatic Transmission Fluid, P/N 88861003 (in Canada, 88861004). Please refer to Bulletin # 09-04-21-003B for repairing the bump feel or clunk noise condition on 4WD vehicles.

 

[swathdiver]

Ron's looks pretty normal and Matt's looks like his has a bad motor mount which is/was causing all that movement.

You only use the synthetic grease on the front prop shaft spline or a one piece RWD shaft. For 4WD use whatever fluid the transfer case uses. For the 800s the AWD was Dex III and the 4x4 used Auto-Trak II fluid. Double check your owner's manual.

Years ago I used to tell everyone to use the synthetic grease on 4x4s until someone corrected me. I put out a correction but boy did I post that a lot all over the place and doubt I found them all!

 

[Massfloefi]

Ron's looks pretty normal and Matt's looks like his has a bad motor mount which is/was causing all that movement.

You only use the synthetic grease on the front prop shaft spline or a one piece RWD shaft. For 4WD use whatever fluid the transfer case uses. For the 800s the AWD was Dex III and the 4x4 used Auto-Trak II fluid. Double check your owner's manual.

Years ago I used to tell everyone to use the synthetic grease on 4x4s until someone corrected me. I put out a correction but boy did I post that a lot all over the place and doubt I found them all!

Thanks @swathdiver. I used synthetic grease today. Didn’t seem to fix my issue. All u joints look fine with no play. Maybe there is a issue with the trans itself. I’ll have to have it looked at.

 

[swathdiver]

Thanks @swathdiver. I used synthetic grease today. Didn’t seem to fix my issue. All u joints look fine with no play. Maybe there is a issue with the trans itself. I’ll have to have it looked at.

Check your motor mounts, especially the driver's side.

 

[Massfloefi]

Check your motor mounts, especially the driver's side.

No visual movement when put in drive and rev the motor. Still possible that it’s faulty?

 

[Massfloefi]

@swathdiver

Looks like the motor mount on the drivers side is broken.

 

[swathdiver]

@swathdiver

Looks like the motor mount on the drivers side is broken.

I "think" that is a good mount actually. What do you guys think? @kbuskill @Rocket Man @Doubeleive @iamdub

 

[Doubeleive]

I would call that good, not the source of your clunk

 

[Massfloefi]

If you zoom in do you not see the separation of rubber as the gas is being applied?

I didn’t think that was by design. I’ve never seen one up close though.

 

[Massfloefi]

Sorry should have been more specific earlier.

@swathdiver @Doubeleive

 

[iamdub]

It might be a little aged/worn and has some separation starting, but it doesn't appear to be completely separated. When the mount completely fails, the left side of the engine torques up under acceleration then slams back down, causing the clunk. Either yours actually IS separated and your helper didn't goose the throttle enough to replicate the torquing you get when driving, or your clunk is coming from somewhere else.

If the rubber is starting to tear and you're gonna be towing soon, you could replace the mount as preventative maintenance and it surely wouldn't be a waste.

 

[Massfloefi]

@iamdub

I believe it has not fully separated. My clunk is not massive from others I have seen so that would make sense.

I’m not 100% sold that this is my issue but it’s the only one I have found.

I was thinking about installing one of ATP’s poly mounts since OEM mounts don’t last long or so I hear. Problem is from everything I’ve read that if you change one to poly you need to change them all.

Thanks for the responses so far gents.