The New Process (or New Venture Gear-same guys) 231 transfer case has to be one of the most popular factory-equipped T-cases ever used in a 4x4. It's found under a multitude of Jeeps (Wranglers and ...
The NP231 transfer case was introduced in the mid '80s on Jeeps and has been the staple in a number of four-wheel-drive vehicles ever since. The NP231 has 2H, 4H, Neutral, and 4L. When Chrysler took ...
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