We get a lot of email from fellow Jeepers wanting to know what the options are for killer transfer cases. Some are looking for strength while others are looking for low gears. In this article we attempt to uncover all that is out there.
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There are several modifications that can be performed on a Jeep transfer case. Most involve replacing the gears in the case to lower the gear ratio to improve slow trail performance. Many of these ratio changes can alter the gears in ranges of 3:1 up to 10:1. Many Jeepers also “clock” the transfer case. This involves rotating the case on the input shaft axis to allow for increased ground clearance under the Jeep’s mid section.
We will cover these on a basis of original Jeep transfer case model.
For more info on the “stock” versions of these transfer case see the Jeep Tech section under Technical and Info
| Dana 300 Found in 1980 – 86 CJ
Whole Cases Advance Adapters Case Gear and Shaft Upgrades JB Conversions Tera Manufacturing Advance Adapters Rotation or “Clocking” JB Conversions Advance Adapters Shifter Options Advance Adapters
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Dana 20 and 18 Found in 1941 – 79 CJ 
Whole Cases None Commercially Available Case Gear and Shaft Upgrades Tera Manufacturing Advance Adapters Rotation None Commercially Available
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NP231 Found in 1987 – 2006 YJ and TJ Wranglers 
Whole Cases Advance Adapters JB Conversions Case Gear and Shaft Upgrades JB Conversions Tera Manufacturing Advance Adapters Tom Woods |
