Ok on the door, it says 50 psi front 70 rear

Opened up the tire pressure hand out that came with my 03 SRW 3500

and it says:

No load: 40 front and 45 rear

with a load: 50 front and 75 rear

Im all confused now

 

You sure about that front psi.I thought ALL with diesel said 65psi front no matter loaded or not.

 

Checked it twice,, No doubt

 

I go by the sidewall.
Max them out if you are towing heavy.
If you run 70 to 80 lbs all the time it will ride a little stiff, the 50 lb recommendation from the factory will make the truck ride spongy so it feels more like a car.
Higher pressures will give you better mpg, find what pressure you like and go with that, keep in mind the front is where that heavy (edit) motor is. I run mine at 75 front and rear all the time, my pirellis are at 60k and still lookin good (probably 1/2 tread or better), 95% hiway, pulling 6k cargo box.

Disclaimer; This is my personal opinion, I have no official expertise or qualifications to advise anyone about tire pressures or anything else on which your life depends, Good luck.

 

I also go by the sidewall. I built tires at a Firestone plant for 30 years, so I have a little experience with this subject.
If you ignore the sticker on the door(as to tire pressure) and go by the Manufacturers numbers on the tire, You will get more tire life and have fewer tire problems. Just my two cents.

 

I also have to say to go with what your sidewalls say. Then you can adjust a few pounds or so depending on load and feel.

 

I started out running 55psi in my original tires then for the last few years I ran 65-70 in the front and 55-65 in the rear and still had tread left when I put new tires on at 76,000 miles. Whats funny is I'm spinning the new General Ameritracs as much or more than toward the end of the life for the Goodyear Wranglers. I'm guessing it could be the 70psi in the rears. (back end runs a little rougher)

 

I've been a little confused about tire pressure too.

When I bought the truck, it had the door sticker pressure. Rode like a wagon. It also shifted strange.

Looked in the DC tire pamphlet that came with the truck, it recommends 45 front, 40 back with 2 occupants and 200lbs of cargo. Did that and it felt like it was stuck to the ground, but the strange shifting went away.

So, I bumped them all up 10 lbs to 55 front and 50 back and it seems to be a happy place for me and the truck.

After 64K I put a new set of Michelins on and the tire shop's computer said 40 front and 65 back so that's what they put in them. I got home and took them to the happy place.

I rarely haul anything so I'll have to remember to add air if I do. I'll keep a close eye on the tread wear to determine if the tires like happy place as much as me and the truck...

Y'all be good

 

I run 55 front, 65 rear empty, and when loaded 75 in the rear.

 

Thanks for the replys, I'll run a few diff settings and find my "happy Place".

 

in the past, I have always run 65front/50rear empty in most of my trucks. My '04 is considerably lower. I believe they're at 45/40, and MAN does it ride nice! steering and braking feel great in it too.

I realize it hurts mileage, but it sure eats up potholes and rail road tracks a lot better!

 

if you are loaded use the max sidewall pressure empty use the higher of door or manual after 50,000 miles look at the wear in the center of tire if it is worn more than the off center decrease by 5 lbs if less increase by 5 lbs