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Look at a tire inflation table for and select a pressure for the new tires that matches the load rating at your old pressures.

From there do the chalk test to see how much of the tread is on the ground. I prefer a strip of wide painters tape across the tread to chalk. With tape I can drive a few miles and get a good idea of where the contact patch is while turning, braking, etc. I’ll adjust until I get just a little bias toward the middle of the tread. I run 55 front and 70 rear. The rear is a bit overinflated for a lot of my driving but I don’t want to have to air them up every time I load the truck. My tires aren’t the same size as yours though.

 

My 2017 F250 4X4 6.2 has LT275/6518 10 ply. They are ran at 50 psi fronts and 46 rears. I can still put a thousand pounds in the back without adding any additional air. I will tow my 14,000 gvw dump trailer loaded and don’t add any air either. Works great for me. Rides great and smooth and the tires wear evenly. Truck is a Super Cab with an 8 foot box with a 164 inch wheel base.

 

My 2019 F350 came with 275/65 20 I just keep the tire pressure as suggested by the manufacturer 60psi front and 80psi rear and she runs like a truck as expected. I'm happy with it.

 

Do what Sport45 said. Get the tire load inflation chart for your tires. Get your truck axle weights. Select the air pressure from the chart for your tire size and your axle weights. My 2019 F250 6.2 with 35x12.5/18 rides great at 55 front 40 rear empty.

 

What Sport45 and Nitebreeze said is spot on. Lower inflation on a tire isn’t just about ride quality. From day one my truck with factory pressures of 70 front and 80 rear has always in my opinion ridden smooth as heck. I’ve never had any issues with the ride quality. What I did have an issue with is that the tires are so crowned that an inch and a half each side wasn’t even touching the ground. In an emergency evasive situation for safety for everyone you need as much as a footprint of your tires on the ground. Lowering the inflation to a load chart inflation for your trucks front and rear weight will give you a much larger footprint, more even wear along with braking and emergency evasive stability. Once you find the pressures that fit your situation you will get improved ride quality not from just a ride stand point but everything I have mentioned. I weighed my truck and did the chalk test. My front tires are perfect. My rear tires still have 3/16ths of tread not touching the ground. It’s a huge improvement for everything.

 

 

I run 56psi front an rear until I hook up my TT, then the rears get bumped up to 65psi.....

 

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that right there tells me you bought a tire with a lower load rating. Not necessarily a problem, unless you tow at max weight limits.

 

On my old Excursion I swapped the factory sized tires (265/75R16) with a max pressure of 80 PSI for new 305/70R18 tires that had a max pressure of 65 PSI. The new lower pressure, but larger tires had a decent increase in load capacity.

 

Yeah, that was the first thing I noticed. I'm surprised the shop mounted them for him. I had a Discount Tire shop refuse to put LT-E tires on my F-250 last year because they were 123 load rated and the door sticker requires 125 minimum.

 

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run my back tires lower than recommended so recommended is 65 psi I'm running 60 psi .It doesn't bounce as much It's like a basketball you put more pressure in it and bounces farther lower pressure won't bounce as much