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what are my option or can I benefit from a programmer or chip. Casn shift points be firmed or changed? calibration for gears or larger tires? 4r70w trans. 5.0 MAF engine.
do I just change the speedo gear for larger tire size and is there a chart to show what size I need? I just changed from stock to 31x10.50 and speed seems to be off 5 mph slow.
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