Slip yoke grease

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Aug 11, 2016 | 11:39 AM

Buck268

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More Turbo

Joined: Feb 2003

Posts: 532

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From: Grand Rapids, MI

Slip yoke grease

Since the slip-bump seems a common problem on these trucks I'd like to ask everyone what grease they prefer as well as how long it lasts between servicing?

I have been using Motorcraft XG-8 (as seen here) and it lasts approx 2 oil changes or between 10-20,000 miles. Considering switching to a moly (MoS2) paste but not sure if would really work better.

Just for the record, I am using it on the front slip yoke into the transfer case on my single piece driveshaft. And yes, I do have the slip-bump. And yes, lubing these splines makes a 99% difference.

Aug 11, 2016 | 01:41 PM

David W Jones

Tuned

Joined: Jan 2013

Posts: 369

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From: Pleasant Grove, Alabama

My 2012 157" wb 2wd required some "blue grease" (XG-8) to cure a slip bump issue @ approx 35,000. Warranty covered it...the only time the warranty was needed for anything. I'm just a few hundred miles shy of 90,000 miles and all is still well.

Aug 11, 2016 | 02:15 PM

Buck268

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Joined: Feb 2003

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From: Grand Rapids, MI

Interesting. Mine definitely is returning again. This will be the 3rd or 4th time applying grease with 81k on the odo.

Aug 11, 2016 | 09:05 PM

Pgh Rebel

Fleet Mechanic

Joined: Apr 2014

Posts: 1,512

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From: Pittsburgh, PA

What is this "slip-bump" you're referring to? I just bought my 2012 4x4 about 4 months ago, currently have about 32,000 miles on it. Previously I had a 2006 4x2 for over 10 years, and never heard of it.

Aug 11, 2016 | 09:19 PM

Buck268

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From: Grand Rapids, MI

Aug 11, 2016 | 09:56 PM

Pgh Rebel

Fleet Mechanic

Joined: Apr 2014

Posts: 1,512

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From: Pittsburgh, PA

Thanks, that explains it. Mine's not doing that yet. Hopefully it never will! But at least I know what to look for.

Aug 15, 2016 | 07:45 AM

King-bRanch

Cargo Master

Joined: Oct 2011

Posts: 2,958

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From: Denver, NC

Mine was doing it when I bought it. It wasn't too bad, but I could feel it & I am not one of those people who just live w/a weird feel. Anyway after Mooresville Ford kept telling me that's all it was & I wasn't 100% believing them, they actually found a TSB that allowed them to do the procedure using the "Shaft Repair Kit" one time at their expense....Problem solved

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Sep 30, 2016 | 04:10 PM

Buck268

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From: Grand Rapids, MI

Well, after finishing installing my new limited slip I dropped my driveshaft to try a different slip yoke grease. Picked up Ford 9L3Z4W602A on ebay which is a kit including a band clamp and a disposable plastic package of white grease. You could probably get two greasing out of the package, but I tried to get absolutely as much as I could on the splines. Its a light, silky smooth grease which is opaque white in color. Totally different than the blue teflon stuff ford sells seperately; also very much different than any type of axle grease, moly paste, silicone compound or teflon grease I've seen. The closest stuff I've seen in Finish Line Extreme Fluoro, which is a PFPAE grease sold by Finish Line for use on high end bicycle components. Many speculate it is a version of Kyrtox. This Ford white stuff is both more viscous as well as more oily in nature, though.

Once again, my slip bump is totally resolved after greasing my transmission slip yoke on my one piece driveshaft. Very curious to see if this stuff will last any longer than the blue teflon grease. Really getting tired of dropping the driveshaft.