Vibration when turning
Junior User
Joined: Aug 2003
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replacing the rear end clutches will do nothing for you vibration from a stand still acceleration while going straight, unless one tire is starting to slip, the rear end vib on turns is usually from clutches, vibration while straight line accelerating may be from u-joints,or a binding slip yoke. u- joints usually cause a vib at highway speed,
Cargo Master
Joined: Sep 2005
Posts: 2,952
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From: Montana
hey guys... I drained my diff. and added some new lube with the friction modifier... It isn't "slipping" as much, but still does a little when turning real tight from a stop, especially on an incline. So I'm guessing my clutches are toast... can the limited slip be replace without messing around with the ring and pinion? can a locker just be put in it's place? also, I've noticed a slight "clunk" now when taking off sometimes, like lash. Does that mean I should replace the gears? are there any TSB's or anything of the sort on this subject. Also, If I have to replace stuff, and want to use aftermarket, what should I get?
New User
Joined: Jan 2005
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Same Issue
My 2001 Ford F150 Screw has been doing the same thing, much vibration while turning at slow speeds, and it gets worse on an incline (turning right is worse than left). My rear-axle was replaced at about 40K (90K now). Someone earlier mentioned an LS additive? Can you post some more details?
Senior User
Joined: Mar 2004
Posts: 169
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From: hallville
USMCPAO use ls additive and go do fiqure eights in a big parking lot ...Slow speed and tight as you can for about five minutes....a couple of minutes each way...That will get the ls additive into the clutch pack otherwise it takes a long time to get in there. Your vib gets worse under inclines because there is more torque applied to the diff which tighten's up the clutch pac. I bet you don't feel any vib coasting around corners...or very little. Just fixed the same problem.... Igf you ever get stuck or burn out and one tire lites up by breaking the clutches loose. Then You will probably develope the same thing because you dry out the clutches and it takes a few corners ....alot of corners both directions to get it all lubed up again in there. U-joints that start to get dry and seizing up are the ones responsible for that dreaded clunk under acceleration...just fixed that too. One u-joint was dam near completely seized.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
Originally Posted by usmcpao
My 2001 Ford F150 Screw has been doing the same thing, much vibration while turning at slow speeds, and it gets worse on an incline (turning right is worse than left). My rear-axle was replaced at about 40K (90K now). Someone earlier mentioned an LS additive? Can you post some more details?
Add it to the diff, then do the figure eights as suggested. It's easiest to add through the ABS sensor hole on top since it's a small bottle.
Steve
Freshman User
Joined: Feb 2005
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I had a similar problem on my 2WD 98 F150. Tight turns from dead stop made an awful noise in the rear. There was a thread on this about a year ago. I tried the additives with no luck. Ended up being a combination of worn rear tires and BAD shocks. Since I replaced both, I have not had the problem.
Cargo Master
Joined: Sep 2005
Posts: 2,952
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From: Montana
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Senior User
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From: hallville
did you say tires and shocks helps a bad vib/noise in the rear end?Wow Thats a head scratcher.Sounds to me like a good upsell job with a free additive thrown in to get rid of your initial problem....
Freshman User
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My best guess is that on tight turns when the differential is kicking in one of the tires would alternately start to slip (poor tread) and then grab. As it did this it set up a slight hopping of the wheel which would not get damped out (bad shock). This made the differential chatter as it tried to accomodate this vibrating wheel. This is the best theiry I can come up with as it definately solved the problem.
New User
Joined: Feb 2006
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Whitbeast97, Ford390gashog is right on the money. I changed my rear Differintial oil with the correct synthetic oil 75-140 however I did not use the friction modifier called for, I felt vibrations with every left turn . I did not know what was causing this problem. Steering gear box was bad, replaced it $325.00 did not correct the problem. Checked ball joints, tierods, c v joints and u joints. Re-read the manual (don't Forget Friction Modifier) 4.95 4oz. Smooth as a kitten. I guess you could say I over paid by 320.00.
Rick
Rick
Last edited by rickvulcan; Feb 24, 2006 at 07:25 PM.
New User
Joined: Aug 2005
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Just to add something that I tried. I have a 2003 F150 SCREW and it was doing the same thing mainly on left turns. I had my tires rotated a month before, but not balanced. Well guess what, today I took it and had the tires rotated and balanced. All is good not sure if thats the same vibration that everyone else is talking about but sounded like it.
Hope this helps
Hope this helps
Thread Starter
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New User
Joined: Jan 2006
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Actually, I had replaced the left front half shaft by Les Schwab, sameday I noticed a bad vibration when I went over humps and took left turns, they didn't gimme a warranty either. I had Ford replace it again just recently and it solved the problem, I guess there are two different axels for my truck, Les Schwab must have put the wrong one on or something. A tech just put the rearend into my mind and I noticed there wasn't any LS additive in it.
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