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to thwart the driver from shocking other drive train parts like the drive shaft, axle shafts and rear end which may still be covered under warranty. the gm print out on this matter clearly states you need to slow your shifts down to prevent grinding and a medium duty trans will not shift as quickly as a corvette. they are covering their ass claiming speed shift grinding is a charachteristic of this manual transmission knowing its designed to under perform to protect weaker drive train components.
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