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Go to this site and read up on Torsion bar keys.
 

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I'm glad You found some answers to some of your questions. I'm not sure about running the 33's but since you already run 31's without the leveling kit then most surely you won't have a problem. I know on that website I sent you the link for, they have a Silverado that has 33's with only the leveling kit.

As far as speedo and such, you could look into getting a custom tune that would not only help you with those adjustments but increase performance as well. The other option would be to buy yourself a programmer from Hypertech or another manufacturer and then you can calibrate for tire size and shift points yourself as well as increase performance.
 
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