Greasing the Slip Yoke Cured Several of Issues for me

[FaaWrenchBndr]

Sorry, just now saw this

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[Jerome10]

Let me know if you want the rest of my tube. I didn't use $22 worth

I’m sitting here laughing about these comments.

I did not fill the whole thing top to bottom, just to be clear for anyone who may attempt this.

However long the nose or applicator tip is on the XG8 tube is how deep I put the lubricant. About an inch deep I’d guess.

 

[JCsTruck]

Let me know if you want the rest of my tube. I didn't use $22 worth

I could come pick it up anytime, even this weekend which gives me an excuse to come see those beautiful cars.

 

[JCsTruck]

I’m sitting here laughing about these comments.

Pfft!

 

[Dakar09]

I’m sitting here laughing about these comments.

I did not fill the whole thing top to bottom, just to be clear for anyone who may attempt this.

However long the nose or applicator tip is on the XG8 tube is how deep I put the lubricant. About an inch deep I’d guess.

Just some good natured fun! I actually second-guessed if I used enough after seeing your glob in there.

I gooped it on my finger and got 'er in there!

@JCsTruck I'm stuck at the house on dog duty while the wife is away. I'll be here!

 

[Jerome10]

Ok I’ve been on this thread way too much…

Is it possible to do damage with the quantity of grease I used? I think excess will just squeeze out? Or will it get stuck in the front end and won’t allow the driveshaft to slide fore/aft?

 

[Dakar09]

There is at least 3/4-1" of the alip yoke that never gets into the transmission, unless you do some serious off-roading. So the grease that wasn't pushed into the splines will probably just wind up in that extra space.

You're good.

 

[Goldeneye36]

I'm really trying hard not to make a "that's what she said" comment but there are too many juicy comments to nail one down.

 

[FaaWrenchBndr]

Ok I’ve been on this thread way too much…

Is it possible to do damage with the quantity of grease I used? I think excess will just squeeze out? Or will it get stuck in the front end and won’t allow the driveshaft to slide fore/aft?

Well, the Ford spline set does not have weep hole, that I know of.
Some manufacturers had a hole at the end of the female side open to the driveshaft. If it were severely over lubed, the grease would get displaced into the center of the driveshaft.

In theory, the Ford design should spit, grease back out through the mating surface of the spine shaft and receptacle.

If it were sealed to the point where it cannot expel the grease then yes it could create a hydraulic type situation

 

[Porpoise Hork]

Depending on who you ask that's known as a dead spline, wide space, or blind spot. If the output shaft has a corresponding uncut section It ensures that the driveshaft is put back in the correct clocked position. This is typically done to ensure proper shaft phasing or assembly clearances. If only the yoke has the dead spline then it can be installed without a specific clock point and generally allows for better articulation as the yoke slides along the output shaft during suspension travel. Either way it's intentional and something that's been present on slip yokes and output shafts for decades.

 

[Dakar09]

So my vibration is worse after I did this . 75+ MPH is no bueno.

I wonder if the slight looseness in the slip yoke from lack of grease was soaking up some of the drive line chatter and now that it's "tighter" with the grease, I'm feeling it more. Driveshaft went back exactly as it was marked, too.

I wondering if they put the driveshaft on wrong from the factory based on how they balanced it.

Also, my transmission is making a very loud whining noise, almost like a supercharger on a Hellcat. It shifts fine, but getting louder. Could that be it, as well? Who know...but it's annoying me.

 

[JCsTruck]

Tony, I would check the following:

• Check that the drive shaft bolts are tight and torqued to spec?
• Make sure that the drive shaft was installed back exactly as it was before by double checking your alignment marks to ensure the driveshaft was correctly seated in the transmission and differential.
• Check the transmission fluid. You may have lost some transmission fluid when removing the drive shaft and now the fluid may be low possibly causing transmission fluid pump to whine with cavitation, especially when cold or the rear seal may be leaking now. Inspect transmission and transfer case fluid levels and condition. Look for leaks around the tailshaft seal.
• Make sure there was no dirt or debris between the u-joint yoke and u-joint. Any misalignment here, even a small one, will manifest itself as a vibration especially at higher speeds.

Hope this helps.

 

[Dakar09]

Tony, I would check the following:

• Check that the drive shaft bolts are tight and torqued to spec?
• Make sure that the drive shaft was installed back exactly as it was before by double checking your alignment marks to ensure the driveshaft was correctly seated in the transmission and differential.
• Check the transmission fluid. You may have lost some transmission fluid when removing the drive shaft and now the fluid may be low possibly causing transmission fluid pump to whine with cavitation, especially when cold or the rear seal may be leaking now. Inspect transmission and transfer case fluid levels and condition. Look for leaks around the tailshaft seal.
• Make sure there was no dirt or debris between the u-joint yoke and u-joint. Any misalignment here, even a small one, will manifest itself as a vibration especially at higher speeds.

Hope this helps.

Thanks for the suggestions.
- They are torqued as they should be, even cross-cross tightened them
- Definitely installed it right to the mark I made on the rear diff
- I only lost a few drops of ATF, but I NEVER checked the fluid from when the truck was new. This whining started when I was in Maine before I did this little job on it. Definitely no leaks under there, though.
- I'm going to pop it back off and check the mating surfaces. I was leaning that way as the cause of this.

 

[Xtremevol]

My thought is maybe you over greased it and now it can’t slide like it should? Similar to hydrolocked.

 

[Dakar09]

Nope. I didn't over-grease it. I applied the same amount I put on my classic car slip yokes and it slid on and off easily I made sure it had full engagement in the trans before I attached it to the rear diff.

This vibration was there the first day I drove the truck home. Was there after I went with new rims and tires, too. And then it got worse after I did this.

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