Sixth gear is a use it when you are able to type gear. When I haul my trailer near the load limit of the jeep I am in 4th and 5th on the highway and rarely ever shift into 6th. With no load on the jeep and flat surfaces, I'm in 6th usually around 40. I have 4.1 gears. Wasn't much different when I had my 08 JKU Sahara with 3.73, just a bit sluggish off of the stop and didn't crawl as nice.
Participate in life....Keep movin'....Go there....JK'n it.........Do it! Jeep #1: Red Rock 08 JK Rubicon 4dr, 6 sp manual, Stock Mud Tires, MyGIG Upgrade, Hard Top, after sale BestTop SunRider Soft Top, Congo Cage Rack, Mopar slush mats Jeep #2 Black 08 JK Rubicon 2dr, 6 sp manual, both tops, some chrome...uggg (my wife's jeep) Jeep #3 White 92 YJ (my son's jeep) A great quote from a good friend: "All hail click clack and master jk'n." Click and clack are my idols!