That is 3.07. Are you giving it a little gas when encountering obstacles, or just trying to idle over them? That gear ratio was the highest ratio that Jeep made which isn't great for your 31" tires, but depending on what you are trying to go over, you should still not be killing your Jeep doing it.
I don't blame the engine, you've gotta give it some gas to get over obstacles.
I have 33s and 3.07 (yes...I know, burn me at the stake) and I've never stalled going over something if I'm on the gas. You can't really go creepy crawly over things
But I guess it depends on how big this obstacle is
But if you have the Dana 35, and they will be swapping all that already, why not upgrade the axle?
Find a 44 from a TJ Rubi, and you will save a bunch because that 44 will directly swap, you get better brakes, stronger diff, a locker, and you'd only have to regear the front axle.
Cost for that depends on the cost of the 44 you find, if you can.
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