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Power Strokes
7.3 Aftermarket
large tuning programs
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[QUOTE="TARM, post: 135158, member: 578"] When you go to upgrading to those 40s you have planned you will need to go to 4.56 even if you do add a good amount of power. If you had more power now the 3.73 would likely be good with the 37 you are currently running but at lower power some 4.10 would help if not 4.30 to add some pickup and responsiveness.. Actually may help mpg as well. [/QUOTE]
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