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Old 12-21-2002, 06:45 PM
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Post bad vibration at 60-70+ any help??

(sorry this could be the wrong place for this Q)
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, 09:00 PM
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Have you checked pinion angle in relationship to transmission output shaft angle. I would also jack the car up and place it on "secure" (key word) jack stands and run it to see if there is a tire wobble or driveline problem. Be careful.
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Old 12-22-2002, 12:42 AM
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misallignment will give symptoms at any speed, what you are describing is an unbalance in the driveshaft, the 60-70 mph vibration is somthing that arrises when the slight vibrations hit the harmonic frequency of the driveshaft.

you heed to take your driveshaft to a shop that can ballance it WITH the yokes on, this is important as the problem can also be caused by a slight yoke runout.
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Old 12-22-2002, 02:00 AM
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Old 12-22-2002, 03:29 AM
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If you were running a short shaft for a while, you might make sure the bushing in the trans tailshaft isn't worn. It can cause the same symptoms as a driveshaft because the front yoke isn't kept centered.
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Old 12-22-2002, 04:12 PM
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its a brand new drive shaft from a shop had it extended and it was like 1/2 or less too short and was fine for a couple of weeks after we put the drive shaft back in place and he balanced it with the yokes on so it isnt the drive shaft.
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Old 12-22-2002, 04:47 PM
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Check the tail bushing in the tranny.
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