Is this issue only relevant to the 4x4 trucks? I have a 4x2 and the description sounds like what I am experiencing....
Just checked under my truck and I have what looks like a 2 piece driveshaft. It has a hanger bearing in the middle, and a bellows of some sort on the shaft directly behind the hanger bearing. Can the shaft be pulled apart by the hanger bearing and greased?

 

Mine has that hard shift/clunk in 3rd/4th gear. Only when I really get on it though.

I did a little reading up on it and suspect its my tranny not being used to that hard acceleration?

Mines a 13 with 285xxkms

 

Bump....
Any thoughts?

 

Would there be a safe way to do this without risking structural failure, especially under load?

 

I'm wondering if this is the same thing my truck is doing?
I have a 2011 F150, 4x2 Super Crew, with less than 40k on it. And I notice it more at a low RPM, basically just higher than an idle, like going through a parking lot. Then the "Bump" happens. To me it feels like the transmission suddenly hits another hear "HARD".
It will also happen when driving, then coming to a complete stop, then releasing the brake pedal and applying pressure on the accelerator (gas pedal). Other than that, no vibrations, transmission is smooth as silk.


Unk Bob

 

Hi Unk Bob,

I'd recommend making an appointment at your dealership for diagnosis. While there, take your tech on a test drive so you can replicate what you're experiencing. Once you've had this checked out I'll be able to research some additional ways to help.

Crystal

 

I have a 2010 F150 4x2 Supercab with the 2 piece drive shaft. Pulled the rear shaft out today, cleaned up the splines (under the black plastic accordion/boot), and lubed it with a pack of the white teflon grease. Reassembled, and road tested. Smooooooooth as butter now!! No slip/bump at all anymore!!! Happy camper!!!

 

Yeah those 2 piece shaft are the most common for this concern glad you fixed it.

 

I am having the same issue with my 2012 5.0. I am almost at 57k miles but I believe the power train warranty is 5yrs/60k miles. Is this issue covered under the power train warranty?

 

Hi Jeremiah Lee,

Your dealership will be in the best position to determine if a repair can be made under your warranty. I recommend making an appointment so they can inspect; once you've had your visit I'll be able to research options to help.

Crystal

 

Thanks Crystal. I dropped it off at a local dealership today and they are going to take care of it. I will keep you posted when I hear back from them.

 

Thanks for keeping me in the loop, Jeremiah Lee; I'll check in on this thread to see when you have any news from the dealer.

Crystal

 

The dealership fixed it by lubing the drive shaft. It was covered under warranty.

 

THIS LUBEING THE DRIVE SHAFT HAS BEEN GOING ON FOR YEARS,I AM 74 AND I CAN REMEMBER BACK 30YRS THAT IT WAS GOING ON THEN THEY WOULD SHOOT SOME GREASE IN THE SPLINES AND IT WOULD QUITE FOR AWHILE THEN START AGAIN.

 

Is there a permanent fix?