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.

Transfer Case Gasket & Seal Kit NP231 JEEP (except Liberty) 1987-2006 (TSK-231J)

Transfer Case Gasket & Seal Kit NP231 JEEP (except Liberty) 1987-2006 (TSK-231J)

$19.95
Jeep Wrangler TJ YJ TRANSFER CASE NUTS 87-02

Jeep Wrangler TJ YJ TRANSFER CASE NUTS 87-02

$3.95
JEEP WRANGLER YJ 87-95 NP 231 4 OR 6 CYL AUTOMATIC TRANSFER CASE SHIFT LEVER

JEEP WRANGLER YJ 87-95 NP 231 4 OR 6 CYL AUTOMATIC TRANSFER CASE SHIFT LEVER

$59.99
1991 Jeep Wrangler YJ NP 231J Transfer Case 23 Spline 6 CYL Manual, 4.0L

1991 Jeep Wrangler YJ NP 231J Transfer Case 23 Spline 6 CYL Manual, 4.0L

$379.00
Jeep Wrangler TJ Transfercase NP231 5sp 4.0L Manual Automatic 97-02 transfer 02y

Jeep Wrangler TJ Transfercase NP231 5sp 4.0L Manual Automatic 97-02 transfer 02y

$359.95
OEM Jeep Wrangler YJ Transfer Case Floor Shifter Lower Shift Boot 87-95 5 sp 94n

OEM Jeep Wrangler YJ Transfer Case Floor Shifter Lower Shift Boot 87-95 5 sp 94n

$34.95
G2 Axle and Gear 37-231FF Transfer Case Kit Fits 94-95 Wrangler YJ

G2 Axle and Gear 37-231FF Transfer Case Kit Fits 94-95 Wrangler YJ

$122.61
Crown Automotive 83502829 Transfer Case Yoke 87-95 Fits Wrangler (YJ)

Crown Automotive 83502829 Transfer Case Yoke 87-95 Fits Wrangler (YJ)

$38.49
Crown Automotive 83502829 Transfer Case Yoke Fits 87-95 Wrangler (YJ)

Crown Automotive 83502829 Transfer Case Yoke Fits 87-95 Wrangler (YJ)

$52.52
2000 2001 2002 Jeep Wrangler 231 Transfer Case   45K MILES

2000 2001 2002 Jeep Wrangler 231 Transfer Case 45K MILES

$650.00
Shift Rail Bushing Jeep Wrangler YJ Cherokee XJ with NP231 Transfer Case

Shift Rail Bushing Jeep Wrangler YJ Cherokee XJ with NP231 Transfer Case

$5.99
Daystar KJ01008BK Transfer Case Drop Kit Fits 87-02 Wrangler (TJ) Wrangler (YJ)

Daystar KJ01008BK Transfer Case Drop Kit Fits 87-02 Wrangler (TJ) Wrangler (YJ)

$37.09
87-95 Jeep Wrangler YJ Transfer Case shifter OEM 4 Cylinder Manual Trans. 2.5L

87-95 Jeep Wrangler YJ Transfer Case shifter OEM 4 Cylinder Manual Trans. 2.5L

$32.99
18676.29 Omix-Ada 18676.29 Transfer Case Output Seal Fits 87-95 Wrangler (YJ)

18676.29 Omix-Ada 18676.29 Transfer Case Output Seal Fits 87-95 Wrangler (YJ)

$13.84
21101 Transfer Case Torque Mount Arm Bushing Set Kit Jeep Wrangler YJ CJ5 CJ7 8

21101 Transfer Case Torque Mount Arm Bushing Set Kit Jeep Wrangler YJ CJ5 CJ7 8

$9.00
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 4.0 Manual NP 231 Transfer Case 23 Spline 97-02

Jeep Wrangler 4.0 Manual NP 231 Transfer Case 23 Spline 97-02

$249.99
Jeep YJ Wrangler 1987-95 NP231 Transfer Case Shifter Shift Bracket Assembly 231

Jeep YJ Wrangler 1987-95 NP231 Transfer Case Shifter Shift Bracket Assembly 231

$45.00
Jeep TJ Wrangler NP231J Transfer Case 4.0L or 2.5L Auto Transmission 00-02 5827

Jeep TJ Wrangler NP231J Transfer Case 4.0L or 2.5L Auto Transmission 00-02 5827

$175.00
Jeep TJ Wrangler Transfer Case NP231J Auto Transmission 4.0L 03-06 2859

Jeep TJ Wrangler Transfer Case NP231J Auto Transmission 4.0L 03-06 2859

$175.00

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