Hey guys. I have a '02 5.9 R/T with the 275/60/17 tires. The sticker on my door says 35 psi, but the tire pressure guidelines that came with the owner's manual says 30psi. Which should I follow? I have 4 new tires and I don't want to wear them out. Thanks.

 

each person has their own opinion on this, i like to run mine in the 35-40 range, some like higher, some like lower, you need to start somewhere and see what pressure works best for you and your specific needs, when in doubt i usually start with the sticker in the door panel,

however since that does not agree with what your manual says, i would do a few things,
1) check to make sure the tire size listed in the door matches the tire size on the truck
2) do the same thing with the number in the book (make sure it is for the right size tire)
3) check the max tire pressure listed on the sidewall of the tire
4) if nothing else, average the two numbers you found and decide from there (try 32-33 PSI)

 

sharpshooter ..
The 275/60/17 are the original size that came with the R/T's and they both match the sticker on the door and the manual. The max pressure on the tire says 44.

 

Well tire pressure is from tire brand an model anymore. So, am assuming the correct answer would be what it says on the tire. NOW with that said when i was at Firestone the last time they deflated my tires to 35psi when i had it 44psi.. Why? i can not answer but i have left at 35psi

 

Tire pressures differ with everyone. It depends on what you want. The tire pressure on the sidewall only indicates max pressure. Just because my tires says 45psi on the side does not mean I will put in that exact amount. I put in 36psi for the better ride and also even tire wear. Only time I will up the pressure is when I am carrying a load. Always remember one thing about tire pressures, heat creates higher pressure readings and cold creates less. min624, try putting in 38psi and watch how it wears, if it starts to wear on the outers sides of the tread, increase pressure to 40psi. If it starts wearing more on the center of the tread, decrease pressure to 36psi. You do not have to put in the max amount, that is the amount that the tire would take with it's full load rating.

 

I always put in 35 to 40 PSI for a better ride and gas mileage too. I have also notice the tires have lasted longer with higher tire pressure. Instead replacing tires at 40k, now they last up to 60k.

 

I always ran at 37 in the front (cause of the added engine weight) and 35 in the rear.