The first question I have for you is what motor do you have? If you have the 4.0 its weight causes the front of the truck to "sag" and reduces tire clearance. Either way you'll be tough pressed to run 31's with no lift. I have a Skyjacker 6" lift on my ranger (same exact model as yours w/ the 4.0) and run 32x11.50's with no problems. I do know a few guys that run 33x12.50's but you usually get some rubbing and need to trim the front fenders. The cheapest way to get bigger tires under there is with a 3" body lift from performance accessories. It will run you about 200 bucks and take you a weekend to install. You would definitely be able to run 31x10.50's with the 3" body lift.
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'66 Fairlane Sedan
Rod and Custom Tubular Front Suspension w/ Rack and Pinion
393 c.i. Stroker, JE Pistons, Performer RPM Heads,
Air Gap Intake, Hydraulic Roller Cam, 7qt. Canton Oil Pan,
Transpecialties C-4 w/ Manual Valve Body
Ford 9" w/ Detroit Locker and 3.89's
Subframe Connectors & Traction Bars
Hedman Headers
Shaved Mouldings
Painted Prowler Orange.
Still Haven't Decided on the wheels or tires yet.
Other Vehicles:
97 Ford Ranger 4x4 & 65 Mustang Fastback
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