Rear clunking sound
 

I have a clunking sound coming from the rear of my X when I stop and take off. The sound does not happen until the vehicle has been driven for a few miles. After it has been driven, I will get one clunk when I stop. When I take off I will get one clunk as the vehicle starts to accelerate, and another clunk as I give it a little more gas. Any Ideas on what could be the cause of this?
I do not get the sound when I shift from park to drive, or drive to reverse.

The problem is:
The Slip-Yoke the rear drive shaft bolts to on the rear-end needs greased..........

The fix:
Take rear drive shaft loose from rear-end, remove slip-yoke, grease spline with a good high-temp. grease.
Reinstall Slip-Yoke and drive shaft, your good to go for another 50,000 miles or so.

Plus one on that.

Thanks guys. Is this something that should be fixed immediately to prevent damage?
Is it it possible to tap and add a grease zirt?

No. It's really just an annoyance. Too little grease from the factory or inferior grease. Once you do it you shouldn't have to do it again.You can but it's not really with the effort and you could possibly run into balance problems...although I doubt it.

The sooner you get it repaired the better, it won't get any better only worse. Every time it clunks it puts stress on the U-Joint and the splines of the Slip-Yoke.
It dosen't have to be fixed tomorrow, but as soon as soon as possiable. About 75.00 from a good shop is what I would guess.

You could easily do it yourself in 20 minutes. I wouldn't bother with a zerk installation. You might never have the problem again as long as you have the truck. Mine had the problem when I bought mine (got me a better deal) but went away before I had a chance to fix it and that was 2 years ago. I would say it is a 1 time problem if that.

Just to make sure this is the slip yoke problem. Mine Does not clunk when I put it in gear. Only when I come to a stop (or near stop) and again when I take off. I hope it is the slip yoke since the fix appars to be quite easy. Thanks again for all the info.

Probably got lucky this time.

Revisiting an old thread.

I plan on greasing the slip yoke on rear to get rid of that dreaded clunk on shifting into gear or taking off.

My question is this: Has anyone or is it typical to do the front as well? Reason I ask is I noticed the front u-joints when replacing my sway bar bushings. Seems like an easy task. I've read the article on doing the rear. Is the front the same?

I have a 2002 F-250 extended cab with the exact same symptom. I've greased the splines twice and no permanent solution to the clunk (or two) on takeoff (or complete stop). Did greasing solve your problem?

Here is a forum that talks about greasing the yoke.

https://www.ford-trucks.com/forums/1...my-2000-a.html

Tim M

That fixed half my noise, the other noise was due to the bumpers on the slapper bars on rear springs were gone.
Not buying it new I did not know they had been there at one time

PS: Re-lubed slip yoke splines today and the clunking is gone! I know now for sure that a double clunk on takeoff and with gentle braking to a stop is due to drying out of Teflon lubricant. This time, however, I've noted the date so that I will be able to see how long this fix will last.
PPS: The splined end of the rear drive shaft in my f-250 is already factory-coated with blue Teflon, indicating that Ford has already tried to solve this recurrent problem.

A few more pic's if needed and a side job or two while in the neighborhood...

https://www.ford-trucks.com/forums/1...nion-seal.html