Transfer Cases

The Wrangler YJ was produced with two different transfer cases: the New Process 207 (NP207) and the New Process 231 (NP231). The 1987 Wrangler YJ came with the NP207 primarily because there was a surplus of them when Chrysler took over the Jeep brand. Up until this point, the NP207 was used exclusively in the 1984-87 Cherokee XJ. From 1988 to 1995, the Wrangler YJ was outfitted with the NP231 transfer case.

NP207 Transfer CaseThe NP207 has an aluminum case. It is similar in appearance to the NP231, but should have a tag (facing the rear of the vehicle) that's stamped New Process Gear Model 207. The NP207 is chain driven. Models mated to a manual transmission have a 21-spline input shaft. Models mated to an automatic transmission have a 23-spline input shaft. The output for the front driveshaft is on the driver's side. The ratio for high-range is a direct drive 1:1 while low-range is 2.61:1. This transfer case is unpopular due to its weakness when used in modified Wranglers for off-road. Many of the NP207 transfer cases have been swapped out in favor of the NP231 transfer case.

NP231 Transfer CaseThe NP231 has an aluminum case. Conversely, it is similar in appearance to the NP207, but should have a tag (facing the rear of the vehicle) that's stamped New Process Gear Model 231. The NP231 is chain driven. Models mated to the Peugeot BA-10 or Aisin-Warner AX-5 transmission have a 21-spline input shaft. Models mated to the Aisin-Warner AX-15 transmission have a 23-spline input shaft. The output for the front driveshaft is on the driver's side. The ratio for high-range is a direct drive 1:1 while low-range is 2.72:1. This transfer case is widely supported in the off-road community due to its strength and ease for upgrading it with parts made by many third-party companies.

NP231 Transfer Case Output Seal Rear for Jeep Wrangler YJ 1987-95 4638904

NP231 Transfer Case Output Seal Rear for Jeep Wrangler YJ 1987-95 4638904

$7.49
JEEP WRANGLER TJ 97-02 2.5 4 CYL 21 SPLINE NP 231 TRANSFER CASE FREE SHIPPING

JEEP WRANGLER TJ 97-02 2.5 4 CYL 21 SPLINE NP 231 TRANSFER CASE FREE SHIPPING

$329.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE SHORT INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE SHORT INPUT NP 231 TRANSFER CASE

$349.99
New Repacement Transfer Case Chain 11650 NP231/NP233 Jeep Wrangler Cherokee 027

New Repacement Transfer Case Chain 11650 NP231/NP233 Jeep Wrangler Cherokee 027

$67.65
JEEP WRANGLER YJ 87-95 2.5 4 CYL AX5 NP 231 TRANSFER CASE 21 SPLINE FACTORY

JEEP WRANGLER YJ 87-95 2.5 4 CYL AX5 NP 231 TRANSFER CASE 21 SPLINE FACTORY

$249.99
NP231 Transfer Case Electric Vacuum Switch for Jeep Wrangler & Cherokee 1988-01

NP231 Transfer Case Electric Vacuum Switch for Jeep Wrangler & Cherokee 1988-01

$24.99
JEEP WRANGLER YJ 87-95 4.0 6 AUTOMATIC NP 231 23 SPLINE LONG INPUT TRANSFER CASE

JEEP WRANGLER YJ 87-95 4.0 6 AUTOMATIC NP 231 23 SPLINE LONG INPUT TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE SHORT INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE SHORT INPUT NP 231 TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$339.99
NP207 Transfer Case Output Seal fits Jeep Wrangler YJ and Cherokee XJ

NP207 Transfer Case Output Seal fits Jeep Wrangler YJ and Cherokee XJ

$9.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$349.99
JEEP WRANGLER TJ 97-02 4.0 6 CYL  23 SPLINE LONG INPUT NP 231 TRANSFER CASE

JEEP WRANGLER TJ 97-02 4.0 6 CYL 23 SPLINE LONG INPUT NP 231 TRANSFER CASE

$349.99
Transfer Case Plug fits Jeep Wrangler Models Dodge Ram Truck NV241 NP231

Transfer Case Plug fits Jeep Wrangler Models Dodge Ram Truck NV241 NP231

$11.99
JEEP WRANGLER YJ 87-95 4.0 2.5  AUTO NP 231 23 SPLINE LONG INPUT TRANSFER CASE

JEEP WRANGLER YJ 87-95 4.0 2.5 AUTO NP 231 23 SPLINE LONG INPUT TRANSFER CASE

$349.99

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