Decided to sell my Mercedes 2006 ml350 and bought a 1999 wrangler with a sbc 350 with a turbo 350 auto trans. I'm taking over someone else's project. my first problem is the axel gearing, the motor is doing around 3k at free way speed. I would like to get it down to about 15 or 18k at 65 mph. I also have to say I am running 33" tires. I believe the transfer Cases are original. The jeep was born a 4 cylinder and standard trans. I believe I would have to change the ring and pinion gears but to what?