92 Lumina sometimes Shakes when hitting about 50-55 mph

[Albanks]

My car shakes violently once in a while when its in overdrive and i hit about 50-55. What could be the problem with it

[jeffcoslacker]

Torque convertor lockup shudder comes to mind...very common, usually goes bad around 75,000-90,000 miles...

Does it go away if you gas it hard or let off the gas?

[Albanks]

Does it go away if you gas it hard or let off the gas?

That is exactly it. So how could i get this fixed??

[jeffcoslacker]

If that's what it is (get a tranny shop opinion,etc) there is a solenoid in the trans that has probably gone bad...it is replaced through the vertical pan on the driver's side of the tranny...the tranny/motor has to be jacked to get access, kind of a PITA...

90% of the time that's the problem...there are other ways the mechanism can fail, but shudder is usually the solenoid chattering and making the lockup do the same...

[Manowarr]

Tire out of balance.

That happened to my car. I could drive fine up to 45 mph. Anything above that and it would shake so much I had to slow down. Changed tires and I was set to go.

[jeffcoslacker]

Yeah most tire defects and balance issues show themselves between 50-60 mph, but won't go away the instant you step down on the throttle or let off...and he said it only does it from time to time...a balance/defect issue would be consistant...