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Project Superburb - NP 203/205 Doubler

Gear Box
Robin Stover | Writer
Posted April 1, 2010

Double Down

For more than 11 years now, Off Road Design (ORD) has offered a NP203/205 Doubler kit designed to multiply the low-range gear ratio of fullsize trucks and SUVs. The kit enables consumers to couple the front half of an NP203 to an NP205, making it possible to run a choice of low-range gear ratios that simply would not be possible with any other factory arrangement. We like the ORD setup because it was designed to handle high torque levels, such as that of the GM Performance crate 383HT found under the hood of our SuperBurb.

Looking at the details, you can break down the Doubler system into three distinct sections: The front half or "gearbox" from an NP203, the billet aluminum ORD adapter plate, and a complete NP205 transfer case. This system provides an additional 2:1 reduction gear, which, when added to the existing NP205 low-range ratio of 1.98:1, multiplies out to a final crawl ratio of nearly 4:1. This combination of gearing vastly improves crawlability and torque multiplication without adversely affecting high-range cruising speed and engine rpm. Thanks to the popularity of the stout NP205 transfer case, this setup will work in a variety of different applications.

The system uses a combination of trail-proven, readily available factory parts, along with a handful of custom components manufactured exclusively by ORD. When compared to other aftermarket transfer cases, the ORD Doubler kit offers unparallel value thanks to the low initial cost of the used factory parts. In terms of strength-to-cost ratio, the Doubler setup is in a league all its own. Check this out: altogether, this project would have cost us just $1,927 to complete (not including labor). And speaking of labor, our capable friends at Right Gear and Axle of Salinas, California, completed the build in 16 hours, which may seem like a long time to some, but Right Gear and Axle pays considerable attention to detail. Follow along as we highlight their work during the conversion process

Adding Up The Costs
Doubler kit $770
Rebuild kit for NP205 $169
Used NP203 $300
ORD Triple Stick shifter $289
Advance Adapters fixed output $399
Total $1,927

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Sources

Offroad Design
970-945-7777
www.offroaddesign.com
Advance Adapters
Paso Robles, CA 93446
800-350-2223
www.advanceadapters.com
Right Gear And Axle
Salinas, CA 93908
831-424-3715

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