Compression Ignition Addict
Join Date: Feb 2007
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You can run a 305/70, some people run a 315/75 with no problems on stockers with no lift. When you start getting into aftermarkets with bigger back-spacing, that's when you start getting the rub. On stock wheels with a 315/75 you might be ok, since you have no leaf springs to rub.
I ran 305/70s on mine stock for a while, but when I went to a 16x10 wheel, I had to lift it to clear.
2004 King Ranch F250 FX4 6.0L
5" Custom Lift with 325/65R18's on KMC Diesels
Stage 1's by Josh Davis (RCD), FASS 150/95@65psi.
Fuel Cross-Over, OEM FPR Plugged
Outlook Monitor, EGR Delete, Throttle Plate Delete, Banks Monster 4"-5" Tip