Tire Pressure
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Joined: Jun 2004
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Tire Pressure
The tag on the door post of my 78 f150 4X4 give the load ratings for the truck with the factory tires at 35 PSI. I have 30X9.5X15 tires on there now and they have their load ratings listed at 50 PSI. What pressure should I run them at?
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Joined: Dec 2003
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You will not be able to go by what's on the door as a 78 did not have radials. The 50 on the tire is the max pressure. I would assume by that max that the tires are load range C tires. I would suggest about 36 to 38 to start. See how they wear and ride. Adjust from there, but I wouldn't run any more than a couple of pounds lower than that.
