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[FONT=Arial, Helvetica, sans-serif]First, the Basics: The Doubler™ is an all gear, dual transfer case system uniquely suited to full size trucks or other heavy duty, high output/abusive applications because of the durability of its components (all massive helical gears and large input/output shafts). Basically, the Doubler™ consists of the gearbox section from an NP203 transfer case coupled to a complete 205 transfer case. This gives you an additional low range gear of 2:1 plus your existing NP205 low gear of 2:1 for an overall low gear of 4:1.
Adding lower transfer case gearing gives you huge improvements in off road control and torque without affecting your highway gear ratios (4.10's with 37-38" tires can work well). Addinga gearbox also allows you to run in your normal 2:1 reduction or in super low 4:1 reduction for best performance in any situation. We use a combination of bulletproof and easy to find factory parts with a minimum number of modified components to give you easy bolt together gearing options. Our baseline kit is just the parts to adapt YOUR 203 to YOUR 205, we can also ship complete 203 and 205 units if you like.[/FONT]
The double and triple sticks are better ways of controlling the transfer cases. (Popular combinations would be an NP203/205 doubler with triple sticks.)