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Old 12-21-2002, 07:35 PM
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Red face bad vibration at 60-70+

Hey could anyone give me any ideas on what might be wrong, i get this horrible vibration in the rear area of my car at 60-70+ its doesnt seem to be to bad while accelerating but when i let up off the gas it seems to get worse till it gets past 60, have changed the drive shaft and mad it a little longer it was a tad bit short thought that would fix the problem seemed to have gone away but it came back we have replaced the rear end in the car has new tires and the tire shop said the wheels arent bent either and checked everything else and we still dont know what it might be no mods have been made to the motor or car that i know and we are kinda out of ideas what it might be but it drives me nuts going down the freeway can anyone offer any ideas, sorry i am new to this site thanks for any help.

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Old 12-21-2002, 09:26 PM
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check your transmission mounts and make sure they are tight. You may also want to check and make sure your frame isn't bent or out of line.
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Old 12-21-2002, 09:34 PM
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Does the pinion have any slop at all?
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Old 12-21-2002, 09:59 PM
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just go 50 or 80 :p

might need to shim the pinion angle? u joints bad?
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Old 12-21-2002, 10:14 PM
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ok lets see if i can answer all 3 in one shot lol,
frame is not bent and the transmission bolts are tight (also an auto not man.) the pinon is good and u joints were replaced within the last 6months.
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Old 12-21-2002, 10:25 PM
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OK, how 'bout the tail bushing in the tranny (can you wobble the yoke)?
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Old 06-09-2010, 11:53 PM
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Bad viberation at 6o-7o+

I had the same problem with a new Ford in 1967. It took me 2 years to find it and you would not believe what it was. (The bushing between the yoke and differential was goose egg shaped causing a vibration every turn of the drive shaft.
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Old 06-10-2010, 12:10 AM
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Start takin' it apart little by little until you zero in on the culprit. With stands under the diff, remove the wheels and tires and run it through the gears. Still there, not the wheels and tires. Gone, wheels and tires at fault. Remove the driveshaft and cap the rear of the trans and run it through the gears. Gone, third member or driveshaft at fault. Take driveshaft to a good shop and have it rebalanced. Still there, engine or trans at fault.
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Old 06-10-2010, 12:12 AM
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what make and year vehicle. Sounds like a pinion bearing, but you said rear was replaced - just what was done.
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