Check out the Advanced Adapters Rubicrawler. It's a new product that should reach the market this summer.
http://www.rubicrawler.com
Advanced Adapters noticed that there's a lot of empty space in the tail housing of the 42RLE four speed automatic transmission used in 4x4 Jeep TJ and JK Wranglers. So they developed a two-speed reduction gear to fit in the empty space.
Result: 4 gears in the transmission * 2 speeds in the reduction gear * 2 speeds in the transfer case = 16 forward gears. The Advanced Adapters web site says they achieve a 108 to 1 crawl ratio using a JK with stock (non-Rubicon) transfer case.
Leaving the transfer case disengaged, you get four new low gears in 2WD that work great for mild off-road driving (or doing burnouts at the drive-in, I suppose).
Because the reduction gear fits inside the transmission, you don't need to buy new driveshafts or fabricate a new frame cross member to remount the transfer case.
Chip Haven
http://www.rubicrawler.com
Advanced Adapters noticed that there's a lot of empty space in the tail housing of the 42RLE four speed automatic transmission used in 4x4 Jeep TJ and JK Wranglers. So they developed a two-speed reduction gear to fit in the empty space.
Result: 4 gears in the transmission * 2 speeds in the reduction gear * 2 speeds in the transfer case = 16 forward gears. The Advanced Adapters web site says they achieve a 108 to 1 crawl ratio using a JK with stock (non-Rubicon) transfer case.
Leaving the transfer case disengaged, you get four new low gears in 2WD that work great for mild off-road driving (or doing burnouts at the drive-in, I suppose).
Because the reduction gear fits inside the transmission, you don't need to buy new driveshafts or fabricate a new frame cross member to remount the transfer case.
Chip Haven