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Power Strokes
6.4 Aftermarket
37x12.5 w/ 2.5 Icon?
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[QUOTE="VanoFord, post: 689087, member: 8541"] No sarcasm. This math formula is a way to determine new R&P from tire increase/decrease to keep the power train back in factory specs. Example: (New Tire DIVIDEDBY Original Tire) TIMES Orig R&P = New R&P (37/34)*3.73=4.06 I used this formula for my 06 Fifty (35/30)*3.73=4.35 So I put a set of 4.30 in the back (2wd truck) and the truck ran like a beast. 65mph and I barely cracked 1800rpm 4.6L engine. [/QUOTE]
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