Mike--- here is what Calmini says:
Calmini TCase Gears

94 % gear reduction for the Xterra & Frontier 4x4!


Finally, a true ROCKCRAWLER Transfer case gear set for for the Nissan Xterra/Frontier 4x4! Our gear set is manufactured in the USA from SAE 8620 alloy bar stock material. For long wear life and operation at high speeds nothing else is acceptable. Final Low Range reduction of 3.92:1 is a whopping 93.86% lower than stock! It completely transforms this vehicle's off road crawl capability.
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We're offering a Spring Introductory Special now! We're taking 15% off through April 30, 2003. Take advantage of almost $200.00 off our regular price.

Download Install Installation Instructions here -15.8meg



Part Number NP35100-24 4cyl Eng Price $1295.00
Part Number NP35100-30 6cyl Eng