Originally Posted by GrnTJ
I had 4.56's and 33's with my 5 spd and it kinda sucked. I would turn 3K rpm the whole trip which killed my gas mileage.
You weren't turning over 3K with that combination at even 70 mph speeds so long as your speedometer was properly calibrated. At 70 mph, that combination would give more like 2600 rpms with 4.56 and a 5-speed transmission which gives very good all-around performance. 4.56 is actually the recommended ratio for 33" tires and the manual transmission. Only if you were used to a car's much lower rpms with tiny tires would you possibly consider the rpms of 4.56 with 33" tires and manual transmission excessive.
Here's a good chart to calculate speeds and rpms with different transmissions, axle ratios, and transmissions... http://www.manoian.net/jeep/gear_ratio_calculator.html
That calculator says you'd have to be driving nearly 82 mph to get 3000 rpms on the tach with 33" tires, 4.56 ratio, and an AX-15 or AX-5 transmission like came in the '99 TJ. Not exactly a recommended or legal cruising speed in most states.