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Re: 98 Lumina Wobble.
Since you seem to have ruled out a tire or wheel by rotating, you may just have a bad strut that lets the rear on that side occilate under certain road conditions...have you ever been able to realize a pattern, like it does it on certain stretches of road, etc?
Shocks or struts that have lost some fluid will allow certain frequecies of motion to continue undamped, and can make that corner of the vehicle feel like it's pumping up and down rapidly...see that a lot in motorcycles too when the shocks go bad or the fork oil is worn out...
You could have a slightly bent stub axle too...with the rear tires off the ground, spin a tire and watch the clearance between the brake drum and backing plate in one spot...it should remain constant as the wheel turns...with a bent stub it'll wobble slightly...I'd expect this to be more constant though...
Two slightly out of round tires or wheels can conspire to produce an intermittant wobble when they phase together...but usually will be felt above 50 mph, and just as you come to a stop....but again if it remained in the rear after rotation, this isn't it...
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You made three mistakes. First, you took the job. Second, you came light. A four man crew for me? F**king insulting. But the worst mistake you made...
...empty gun rack.
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