[CC69Rat]

When purchasing dropped springs, they are marketed and sold as 2" drop for example. That 2" is measured against a new stock height spring

Considering our trucks are 50+ yrs old, and just general use (some heavier than others) and time carrying the weight of the truck, what's in the bed, etc.. the stock springs in your truck now have likely sagged 1" or so compared to a new stock height spring.

What I'd do (for what that's worth) is switch your tires to the size you want and get the look you're wanting, then make a decision if you want to lower it. As much as I like a lowered truck honestly I think I'd leave it just like it is if you're going with 31x10.50.

Your 275/60 is 28 in tall, with 6.5in sidewall height.

The 31 will have 8in sidewall which may introduce issues turning or rubbing on the front inner fenders especially if you lower it.

Just my .02