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2005 F350 w/3.73

1316 Views 5 Replies 5 Participants Last post by  SmokeyWren, 
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I am considering replacing the stock tires with 35X12.5 R18 E rated Procomp Xtreme AT's. I have the stock 3.73 gears and occansionaly tow a 25' toy hauler. Will the 35's kill the bottom end and should I get 4:10's? The truck has an 4" turbo back exhaust, 2.5" leveling kit, and the rest is stock.
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I am going through the same dilema. I found this website useful to look at how RPMs change with tire size and gearing.

Engine RPM Calculator
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