If you are not installing the gears yourself, don't buy them on your own and have a shop install them for you. If you did it that way, the shop will only warranty their labor and not the gears if something goes wrong afterwards. The gear dealer will blame the installer (whose fault problems normally are) and the installer will blame the gears and parts you provided.
If you do have a Dana 35c rear axle, I can't recommend 35" tires... especially after regearing the axles to the appropriate 4.88 ratio which will up the torque sent through the axle shafts. Dana 35c axles are getting iffy with 33" tires and 35" tires are almost a certain busted axle shaft on a tough trail.
If you want to run 35" tires, install a Super 35 kit into your Dana 35c which beefs up the axle shafts which will make it worthy of such a big tire. Superior Axle is the manufacturer of the true Super 35 kit. There are imitation Super 35 kits that I can't recommend for 35" tires.
To know for sure if you have a Dana 35c or the stronger more desireable Dana 44 rear axle, look at the rear axle's differential cover. If it has a perfectly oval shape with a black plastic snap-in cover in the lubricant fill hole, it's a Dana 35c. If the cover is more stop-sign shaped with a threaded steel plug in the lubricant fill hole, it's a Dana 44 which is fine for 35" tires as is.
For your front Dana 30 axle, just look for a "standard rotation" or "straight cut" ring & pinion gear. The wrong gears for your TJ's front Dana 30 that will not work are "reverse rotation" or "reverse cut".