CUTLASS high speed vibration

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455bober

Not-quite-so-new-guy
Oct 28, 2018
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I am new to this 87 Salon and haven't driven it much yet . It's in excellent condition and has been checked over for worn parts . The last drive last fall I was able to get on express way for first time and discovered a high speed vibe . I replaced u-joints first thing as they were originals. The tires were old and a couple were worn bad so the first thing I did was replace the tires a week ago . The vibe is still there . I went back to tire store and they rechecked tires and wheels . There's one with a little run out but it doesn't seem like much to me . More of a vibe than a bounce starts most at 60mph and up . Just checking in here to see if there's a common issue with this model other than wheels /tires tire balance to trouble shoot ? It has around 85,000 original miles and has been well taken care of . Thanks for any leads to check first !!!
 
Where do you feel it? Seat of your pants or steering wheel? Vibrations that happen at a faster rate (frequency) but are not violent are usually drivetrain related. Axle, rear end, driveshaft, etc. Nothing common besides u-joints...
 
It feels like the whole car but it's more likely in drive train .If I had to describe it from other cars I've driven with a bad u-joint I would say seems close to that vibration ! I haven't checked it yet with it on jack stands and in gear to spin the rears up to speed .
 
Brake caliper locking up?
 
Doesn't seem to be any problems with that but will be checking for sure! Thanks guys I'll be getting to this soon . Looks like we have some time for it now !!
 
The factory manual has a troubleshooting guide for this very thing as well as a driveshaft balancing procedure using some hose clamps.
 
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