Have your tires balanced also. There are so many things that could cause a vibration in your stick. I'd say between what you and Coupe50h have suggested, you've got a good place to start.
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'90 GT Under construction
Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!!  
04 F-150 STX 4.2L 5 spd
Rice Haters Club Member #128
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