Jeep Cherokee XJ 1994-1999 Jeep Wrangler 1998-1999 Transfer Case
- Brand: New Process/ New Venture
- Model: 231J
- Fits: 94-99 XJ Cherokee – 1998-1999 TJ Wrangler
- Part # of Unit: 52099211
- Build Date: 09.12.96
- Ratio: 2.72
The 231 has a driver’s side front output and centerline rear output. The NP231 features two ranges; a low range gear that is a respectable 2.72-to-1 (the lowest of all the Jeep transfer cases with the exception of the NP241OR) and a direct-drive in high range. It features three modes; two-wheel-drive, four-wheel-drive and neutral – for a factory combination of 2H, 4H, N, 4L. Aftermarket modifications allow for the addition of a 2 Low position.
Early NP231’s on Jeeps with a vacuum front axle disconnect feature (as is usually evident by the presence of a vacuum switch on the NP231) did not have a true neutral disconnect when shifted into neutral. The front and rear yokes remained connected. With the advent of full-time front axles in the Cherokee and Wrangler Jeeps, the vacuum switch was removed and Neutral became fully neutral, separating the input shaft from the output shafts and the output shafts from themselves.