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Tire pressures you're using? Last four-wheel alignment? Was a printout provided? Last time the suspension's components were thoroughly checked? Expensive tires as in? Cheap tires as in?
 

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For what it's worth, used to run 37psi in the front and 39psi in the back on the G8. Unable to recall the recommended factory cold tire pressures. By the way, is the 34psi cold or hot?
 

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... I have 275/30/20 in the rear . And 245/35/20 In the front...
Correct. Running a staggered versus square setup. Can't rotate front to back merely left to right. Since it isn't the alignment nor suspension/steering related nor improper tire pressures nor frequent burnouts then best of fortune locating the solution.
 
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