Rear end vibration
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Cross-Country
Joined: Feb 2018
Posts: 73
Likes: 29
From: Tomahawk
Rear end vibration
I've got a 2003 F150 with 96,000. I first noticed the vibration when at a stop light , and making a left hand turn, very slight vibration. I took it to my mechanic, and he changed the fluid in the rear end an put in an additive. That didn't seem to do the trick, so then he put in new clutch pks., that worked for a while, I took it back, he again changed the fluid, did the additive, and mentioned moisture is somehow getting in, and possibly causing this problem. My mechanic is a good friend and a top notch mechanic. Anyone got any ideas I could mention to him ? His only fault is he is a Chevy guy. 
Any advice would be greatly appreciated. Thanks !
Any advice would be greatly appreciated. Thanks !
Hotshot
Joined: Jul 2020
Posts: 10,452
Likes: 2,630
From: Near Salt Lake City
It sure sounds like not enough friction modifier was used
I have seen boat tow trucks with milkshake fluid have no issues until the bearings fail
Clutch pack chatter is a real common problem as the fluid breaks down
More friction modifier has or needs to be added
My advice
Put two more ford bottles in and watch your chatter fade away
I have seen boat tow trucks with milkshake fluid have no issues until the bearings fail
Clutch pack chatter is a real common problem as the fluid breaks down
More friction modifier has or needs to be added
My advice
Put two more ford bottles in and watch your chatter fade away
More Turbo
Joined: Oct 2019
Posts: 632
Likes: 92
Do you have a 4x4 or 2-wheel drive truck?
On most 4x4 trucks 2 door cabs short-wheelbase type the bearings at the transfer case on the yoke is a double setup type with what Ford calls a centering peace inside that can and does wear out.
If the bearing wears out it will start as a small vibration and get worse with time. Look under your truck and see if there are two drive shaft bearings at the front of the driveshaft by your transfer or transmission. If there is that may or may not be your problem.
The centering peace is attached to one of the bearings and rides over a shaft inside the driveshaft and has its own bearing. Just replaced one on one of my trucks and had to get my driveshaft end replaced for the newer size one as Ford only made the type I had with the Ford factory lift for two years and then went to the larger one.
On most 4x4 trucks 2 door cabs short-wheelbase type the bearings at the transfer case on the yoke is a double setup type with what Ford calls a centering peace inside that can and does wear out.
If the bearing wears out it will start as a small vibration and get worse with time. Look under your truck and see if there are two drive shaft bearings at the front of the driveshaft by your transfer or transmission. If there is that may or may not be your problem.
The centering peace is attached to one of the bearings and rides over a shaft inside the driveshaft and has its own bearing. Just replaced one on one of my trucks and had to get my driveshaft end replaced for the newer size one as Ford only made the type I had with the Ford factory lift for two years and then went to the larger one.
Hotshot
Joined: Jul 2020
Posts: 10,452
Likes: 2,630
From: Near Salt Lake City
I would assume the mechanic checked the driveline carrier bearing before messing with the rear end
3 tubes of friction modifier in most of them to cure the chatter
3 tubes of friction modifier in most of them to cure the chatter
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Cross-Country
Joined: Feb 2018
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From: Tomahawk
Hi Guys,
I'm still having problems with this vibration. From a stop, turning left I get the vibration, my mechanic has changed the clutch pks, replaced the fluid, then put in the additive, that solved the problem for a while. He did this back in April of 2020 , the truck had 81,000 miles on it then. It's a 2003 F150 with a 5.4 in it. Then in April of this year, the problem reappeared, the truck had 95,000 miles on it at that point. I had him add another bottle of additive, the problem went away, but is now back, and the truck has just turn 100,000 miles. He thinks moisture is getting in there and causing this problem. Anyone got any advice or similar problems like this. On his invoice in 2020 he used 75w90 and the additive, in 2022 it looks like he used 75w140 lube and one additive and a new gasket. Would just adding more additive solve this problem ?
I'm still having problems with this vibration. From a stop, turning left I get the vibration, my mechanic has changed the clutch pks, replaced the fluid, then put in the additive, that solved the problem for a while. He did this back in April of 2020 , the truck had 81,000 miles on it then. It's a 2003 F150 with a 5.4 in it. Then in April of this year, the problem reappeared, the truck had 95,000 miles on it at that point. I had him add another bottle of additive, the problem went away, but is now back, and the truck has just turn 100,000 miles. He thinks moisture is getting in there and causing this problem. Anyone got any advice or similar problems like this. On his invoice in 2020 he used 75w90 and the additive, in 2022 it looks like he used 75w140 lube and one additive and a new gasket. Would just adding more additive solve this problem ?
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Hotshot
Joined: Jul 2020
Posts: 10,452
Likes: 2,630
From: Near Salt Lake City
IMO
You simply need more friction modifier additive (is what I am thinking)
Ford used to have us put 2 little bottles of that stinky friction modifier in there (in say an 8.8)(after an overhaul) (it was never enough)
Then we would go road test them, and if the chatter was still there, after some break in time (10 or so figure eights in a big parking lot)
We would have to put another couple of tubes in there
So if you have 4 or 5 in there and it still chatters
Try the break in procedure one more time
Then and add another bottle of friction modifier one at a time
Should not take more than about 8 bottles even for a 10.25 Sterling
You simply need more friction modifier additive (is what I am thinking)
Ford used to have us put 2 little bottles of that stinky friction modifier in there (in say an 8.8)(after an overhaul) (it was never enough)
Then we would go road test them, and if the chatter was still there, after some break in time (10 or so figure eights in a big parking lot)
We would have to put another couple of tubes in there
So if you have 4 or 5 in there and it still chatters
Try the break in procedure one more time
Then and add another bottle of friction modifier one at a time
Should not take more than about 8 bottles even for a 10.25 Sterling
Thread Starter
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Cross-Country
Joined: Feb 2018
Posts: 73
Likes: 29
From: Tomahawk
Thank you for the reply, I know nothing about this, I can build you a house, but this I rely on the professionals. So would you just add more modifier, or drain it all and start fresh?
Laughing Gas
Joined: Jan 2006
Posts: 1,098
Likes: 11
From: Minnesota
That rear end calls for 75-140. ....not 75-90 he used the first time. I would get it warmed up good then drain it all out, Use 75-140 with the friction modifier already in the oil. With the cover still off dump in "almost" a full bottle of friction modifier. A full bottle will drip over the rear lip when the cover is off. Dump the last little bit in one of the new oil bottles before you dump it in. Fill and spill (3 quarts). I prefer a gasket over sealant for cover.
FWIW.....at 190,000 miles (same truck 2003 F-150 FX4) my diff cover was weeping. Took it off and cleaned all the goop off, used a gasket. I bottle of friction modifier and 75-140 with friction modifier in it. Right away I noticed from a dead stop on a RH turn some vibration. Pulled the plug and too full to add anything. Use an old anti-freeze tester and sucked some out. Dumped in another small bottle of that friction modifier and that solved it.
FWIW.....at 190,000 miles (same truck 2003 F-150 FX4) my diff cover was weeping. Took it off and cleaned all the goop off, used a gasket. I bottle of friction modifier and 75-140 with friction modifier in it. Right away I noticed from a dead stop on a RH turn some vibration. Pulled the plug and too full to add anything. Use an old anti-freeze tester and sucked some out. Dumped in another small bottle of that friction modifier and that solved it.