Your comparing a Jeep to a wrangler...... apples to oranges. When chrysler started making their wranglers the drivetrain was all different than Jeeps were. Even though the looks resembles a Jeep most things are different. Your Jeeps Tremec T-176 is a strong tranny, as is the dana44 axles even though you have really high gears for using 35" tires, which also explains the better gas mileage.
ps. With those high gears and 35's.... your not set up for crawling, your set better for highways without hills. Just sayin...