Which is how it "should" be. Most converters are rated at what RPM they will flash too (depending on all other factors though)Understood but the 4.8 is know for a higher rpm peak torque. I know this does nothing for most but randy think about the converter i had in my car, 2500 stall but very drivable. Let off the brakes at a light and the converter will move the car but under heavy throttle or brake torque it would stall to 2500 then drop in.
I ran a 5,500 on the street for a long time, and still run a 4k+ all the time. I'd be more concerned about heat than anything, but then again, I don't use my Jeep for anything like you're planning, so I don't know the affects of a higher stall in that scenario. For what you're doing, I'd just be more concerned on heat buildup from a higher stall.