You may have have taken away your compound final drive ratio with those 20" wheels. If you still have your stock 17" wheels and tires, measure your overall hight or roll out and compare them to the 20's. If there is more than 10% difference (17's being shorter) I would put the stock wheels back on and return the tune to stock and get a better base line from there. After all it would be a no cost change. I thought those trucks were a little quicker than that stock? Is it 2wd or 4wd ?

 

a tune will deff wake her up..

 

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Right there in SA, Allen will hook you up.

 

How big of a stahl would be need for my application and who makes a good one?