Rear vibration from acceleration - F150online Forums



Rear vibration from acceleration

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  #1  
Old 02-02-2011, 11:48 PM
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Rear vibration from acceleration

hey guys im getting a vibration coming somewhere from the rear. mainly does it if im stopped and go to turn, and does it very slightly i i accelerate in a straight line. any ideas?
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Old 02-03-2011, 08:20 PM
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have you ever replaced your rear diff fluid? i assume you have a l/s differential and it is time to change the fluid. don't forget friction modifier.

post your rear end, gear ratio, and whether open or limited slip first though.
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Old 02-04-2011, 12:43 AM
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3.55 ls and just changed it at 100,000 miles and im at 135,000 now. i did put friction modifier in. one tube of it
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Old 02-04-2011, 10:47 PM
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next thing to check is u-joints.
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Old 02-05-2011, 12:28 PM
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Does it happen when you accelerate to pass someone on the highway?
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Old 02-05-2011, 01:13 PM
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nah. pulled the fill plug yesterday to find all grey/metallic colored "sludge" built u[p on the plug and inside along with metal particles. so im guessing the clutch packs are shot. gonna have a friend who owns a trans/rear shop do it in about a week
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Old 02-07-2011, 06:42 PM
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Quote:
Originally Posted by AAK625 View Post
Does it happen when you accelerate to pass someone on the highway?
hey mine started doing that this morning. i figured it out that it only happens durring lock up. (when in overdrive) and when i want to pass someone on the frwy or just slight accelerate i feel vibrations only during the downshift. could it be my diff having too much play? help plz!
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Old 02-07-2011, 07:02 PM
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Are you sure it's not a COP issue? Are you getting a MIL when this happens?
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Old 02-09-2011, 11:24 AM
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no on both counts
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Old 02-09-2011, 09:13 PM
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By the way, it takes 2 bottles of friction modifier for a 2000 model. The clutch packs are tight. There is a TSB on this. The official Ford fix is to replace the clutch pack and reduce the shimming by 0.010". The fix the parts guy told me about was to use 2 bottles of FM. He said that is what most people did. I did and it worked.
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Old 02-09-2011, 10:01 PM
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mine does this only in a straight line and only when I come to a full stop than acclerate. Doesn't happen very long and its not super noticable. If i accelerate slow enough/fast enough its not noticeable. Its fine when turning and everywhere else. The Diff fluid was replaced about 10K kms ago. Any idea?? 2006 F150 FX4 3.73
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Old 02-13-2011, 12:39 PM
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Just running thru threads, but I am sort of in the same spot but I get a very noticeable vibration only when at a dead stop turning in both directions. The vibration is clearly in the rear and not up towards the tranny. Its always slightly been there I think, but over the last week its gotten way worse. Any thoughts?
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Old 02-13-2011, 02:33 PM
glc
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Refer to the new thread you started.
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