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2005 F350 w/3.73

1317 Views 5 Replies 5 Participants Last post by  SmokeyWren
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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searched this out from the past , but am dealing with the same sanario right now. i already have had 35's on my 06 250 3.73's for some time. problem is it cant tow squat undder 80 mph and mantain speed. only at 1800 rpm at 70 (corrected speed) already made up my mind to regear but dont want to over gear either. looking to be in the sweet spot 2100-2200 rpm at 75. 4.10's or 4.30's. anyway to calculate this before the swap.
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