Which engine is in your Jeep? I can see that you might have problems with the 4 bangor, but you should have no problems with the I-6. If you istall the 33" tires, you would be happier with the 4.56 gears. We have the 4.10's that come with the Rubi, and have 33" tires on it. It does just fine. It will cruise at 75-80 mph all day long. I have also know others in our club to put the Air-raid system on their I-6, and claimed they had much better acceleration. But they are also still running 3.07's with 33" tires. I must also note here that they are not able to wheel with us, because they can't climb any hills with such high gears. My brother in law, has a unlimited with an auto tranny, I-6, 33" tires, and the 3:73 gears, 2" BL, and does just fine cruising down the highway.