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Teraflex LOW 231 HD Transfer Case for 87-06 Jeep® Cherokee XJ, Wrangler TJ & Unlimited

The Tera Low231 conversion kit is the solution for providing Wranglers, Cherokees, and Comanches with low crawl ratios. This kit provides rock-crawling performance without affecting high range gears for daily drivers, or the trip to and from the back country. It provides a true 4.0:1 reduction through a heavy duty 5 gear planetary system. Every part in this kit is new, with no core charges. Shift linkage and driveshaft length changes are not necessary.

The Tera Low231’s high input torque rating will handle extreme torque applications.
Each Low231 is covered with our exclusive two-year warranty.
The 4.0:1 gear reduction planetary
is the heart of the HD 231 transfer
case. Our planetary features a
hardened steel housing and gears.
TeraFlex is still the only aftermarket
company to offer a low range gear
conversion for the 231 transfer
Because of the additional gear reduction
when in low range, engine
RPMs should be kept under 2500
(remember the planetary is turning
at 4 times that rate 2,500 x 4.0
= 10,000 RPM). Severe transfer
case damage can occur if this RPM
warning is not observed. Check the
oil pump screen for blockage.
Recommended Accessories
The Tera Low231 is compatible with the 2WD Low-Range Shift Kit, the
TeraLow Extreme Short Shaft Kit, and the Short Shaft Kit.
Low Range Crawl Ratios
Trying to figure your final low range crawl ratio can
sometimes become difficult. There is a zone that is ideal for rock crawling and other off-roading. Generally, a crawl ratio between 50:1 and 75:1 works well in hightraction terrain.
Crawl ratios are calculated by multiplying the axle
ratio by the transmission’s first gear ratio by the transfer case low range ratio. This gives you the final crawl ratio. Generally a final crawl ratio of 50.0:1 to 100.0:1 is a good off-road crawl ratio. This chart shows the improved gear reduction benefits of the TeraFlex Low231 case.
To find your crawl ratio, use this simple formula (refer to the chart). Multiply the first gear ratio by the transfer case ratio. Multiply that number by the axle ratio (of the ring and pinion) to get your crawl ratio.

Installation Notes
Installation Difficulty:
Level 3Advanced

Must Reuse Original T-Case Studs

Installation Time: 4-6 hours
Parts Included

Low231 Case
Front Output Seal

  • Transfer Case Model: NP231
  • Jeep Wrangler (TJ)

  • 2006 Jeep Wrangler (TJ)
  • 2005 Jeep Wrangler (TJ)
  • 2004 Jeep Wrangler (TJ)
  • 2003 Jeep Wrangler (TJ)
  • Jeep Wrangler Unlimited (TJ)

  • 2006 Jeep Wrangler Unlimited (TJ)
  • 2005 Jeep Wrangler Unlimited (TJ)
  • 2004 Jeep Wrangler Unlimited (TJ)
  • Jeep Cherokee (XJ)

  • 2001 Jeep Cherokee (XJ)
  • 2000 Jeep Cherokee (XJ)
  • 1999 Jeep Cherokee (XJ)
  • 1998 Jeep Cherokee (XJ)
  • 1997 Jeep Cherokee (XJ)
  • 1996 Jeep Cherokee (XJ)
  • 1995 Jeep Cherokee (XJ)
  • 1994 Jeep Cherokee (XJ)
  • 1993 Jeep Cherokee (XJ)
  • 1992 Jeep Cherokee (XJ)
  • 1991 Jeep Cherokee (XJ)
  • 1990 Jeep Cherokee (XJ)
  • 1989 Jeep Cherokee (XJ)
  • 1988 Jeep Cherokee (XJ)
  • 1987 Jeep Cherokee (XJ)
03-06 Wrangler with Automatic Transmission 90-01 Cherokee XJ with Automatic Transmission 87-90 Cherokee XJ with 23 Spline AX15 Manual Transmission