3.5" AEV lift kit on a 2-dr 2012 JK. Dave at AEV suggests 28psi. Discount Tire says 35psi.

 

Im running 28 in my grapplers.

Do a search. There has been a couple threads on this topic.

 

From the FAQs:
Q: On the road, what PSI should I be running in my tires?
A: For optimal comfort and even tire wear. you should not run the recommended PSI listed on the sidewalls of your tires. Typically this will be way too much. On average for a 33" tire, I would recommend that you run your tires at approximately 28-30 PSI. For a 35" tire, I would recommend running approximately 26-28 PSI. For a 37" tire, I would recommend approximately 24-26 PSI.


I run my 35s at 29-30 psi. 35 psi would be too much.

 

28 psi. It's what I run. 35 will beat you up. The tire places think all vehicles are Honda civics.

 

I'm running 32-35 psi in my 315/70R17's and love the ride and handling characteristics.

 

Running 30 in mine

 

28 psi with 8" wheels and 315's

 

38 on the street with MT Baja Claw 35's was suggested by MT Rep.

 

28 here seems to be about right on my 35's, the tire store put in 40 when they mounted my tires and it rode terrible.

 

26 PSI on the street, 315/75/16. 28+ starts to ride a bit too rough for our crappy roads.