Do you have a one piece driveline or a two piece?

If the two piece, check the rubber yoke in the middle, it most likely needs grease. Also check the 4x4 actuator motor.

 

I was thinking about the trans stuff, and... like. Hold up.

I did some more searching and.
Lots of posts pointing at driveshaft issues with this truck and u-joint tight issues causing weird stuff.

The driveshaft has been replaced in this truck previously.
I dont like this aluminum driveshaft ****, but.. meh.

I think i'm going to listen to my mechanic friend and pull the driveshaft to check it vs being a lazy git and just unloading it and checking the slop.

 

I just occurred to me that in the earlier years of this generation, there were complaints of thuds coming from the transmission. It turned out that the issue was dry splines on the output shaft. Ford put out a TSB about it, and recommended a specific type of grease to coat the splines. Once that was done, the problem went away.

 

That was my experience. I used the prescribed by Ford spline grease and the notorious "F-150 Clunk" disappeared. Some mysterious vibes vanished as well. Between that and the shudder fix ATF additive, my truck drives like a dream. Recently had a family member drive my truck for the first time. Also was her first time in a full size truck. Her immediate response when dropping it into drive was WOW, this is nice, its like a 4WD luxury car! She decided to borrow it for a week and said she loves it!

 

I had the driveshaft off yesterday and the yoke wasn't soaked, but it was wet, so there was fluid getting in there.

I can see where this could be an issue though. It's worth looking into as when I put the drive shaft back in, I didn't index it the same. And the vibration is worse.
So quite possibly the issue.

i've had spline issues before with other vehicles, but they made more of a drone sound, not cause driveline vibration liek a bad u-joint, so didn't think of that.

Of course, gonna have to find the right grease for that one, cause you can hydrolock that yoke.

 

Anyone got a link to the bulletin or something on that dry spline issue?

Not easily finding it on a search, getting everything but info on it.

 

I didn't look to close at the TQ, as the system, from what a quick look, seemed like an "always locked" TQ.

I should probably check that for sure if its supposed to be disengaging the TQ link up for the front also.

All my stuff is manual everything.
So, when it works is when i tell it to.
Unless it goes kaboom. haha

 

Why the **** is this so hard now on google and **** to find stuff.

I'm searching for the TSB, not a single forum, not a single anything. They will talk about the TSB. "oh in that other thread i'm not going to link, we discussed this already."

Anyways.
I hate the internet now. I'm searching for somethign specific, not your ****ing guess at what I want search engine.

I digress.


Reading a tiny bit, it looks like part of that TSB involved drive shaft replacement, along with flange/yoke replacement as well. Though, it's difficult to tell if the flange or yoke were replaced, as... northern vehicle. Though, to my eye the yoke was NOT replaced.

The other randonmess on the output shaft grease had to do with large clunks while putting the vehicle in drive, but I can't find anything directly pertaining to the drive shaft output yoke, only on a 2 piece driveshaft with the slip yoke part. Are we getting these confused? I have a single piece.

Wish I had thought to maybe grease it yesterday before i uggadugged the flange bolts back in, such a PITA to take the driveshaft out. And loctite of course.

 

If i recall.

The 2 piece was causing vibrations and a clunk from stop and go. I have the 2 piece in my 2010.

I greased the yoke, replaced my 4x4 actuator motor and replaced a slightly weak u joint.

This was a year ago, unfortunately my truck hasn't moved since due to my health and doing a full blown refresher on the engine. The timing, cams, etc etc upgrades.

 

I'm with you. Used to be a lot easier to find those TSBs. Here's a good video that shows how it's done.

 

Fascinating.

I wish they would just tell you what grease, because that looked just like blue wheel grease to be honest.

Worth a shot though. Like whats it going to do, maybe fix my issue?

I'm trying to do as much piddly small stuff before I throw in the towel and let a shop dicker with it.

 

Sorry to hear you're health isn't doing well.
Hopefully you're able to get better.

 

This is the stuff. Motorcraft XG-8

https://a.co/d/0hcpZpql

 

Appreciate the thought, unfortunately I need a kidney transplant.

Im at stage 5 failure, 12%. But im doing my best to keep a half cup full attitude.

 

PTFE lubricant, interesting.
Glad I didn't slather some axle grease in there. hahaha. thank you.