Re: 4.56 or 4.88...that is my question.
Still waiting on the 4.56s to arrive, but I moved forward with the reprogram using the Superchip Cortex 2950.
I selected a performance tune and programmed in new tire size. NICE results! Based upon my typical city/highway driving to and from work yesterday and today I'm back up to 12.0 mpg and the truck's acutally got some pep in its step.
I haven't felt an automatic shift like that since I put a shift kit in my '70 Fastback years ago. The new shift points are awesome...really starting to get the power back to the wheels. I think the gears will be the icing on the cake.
I guess I'm just impressed that a 'tune' could make such an improvement.
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