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.

Jeep Wrangler TJ Transfercase NP231 5sp 2.5L Manual 97-02 4 cyl transfer 97k

Jeep Wrangler TJ Transfercase NP231 5sp 2.5L Manual 97-02 4 cyl transfer 97k

$349.95
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
1987- 91 JEEP YJ WRANGLER 6 CLY 23 SPLINE TRANSFER CASE FOR AUTOMATIC TRANS

1987- 91 JEEP YJ WRANGLER 6 CLY 23 SPLINE TRANSFER CASE FOR AUTOMATIC TRANS

$299.00
NOS MOPAR NP 231 Transfer Case Front Output Flange Yoke Jeep Wrangler Cherokee

NOS MOPAR NP 231 Transfer Case Front Output Flange Yoke Jeep Wrangler Cherokee

$98.50
G2 37-231 Transfer Case Rebuild Kit NP231 for 87-94 Jeep Wrangler/Cherokee

G2 37-231 Transfer Case Rebuild Kit NP231 for 87-94 Jeep Wrangler/Cherokee

$103.99
Jeep Wrangler YJ Transfer Case Shifter Bracket For AX5 5 Speed Transmission

Jeep Wrangler YJ Transfer Case Shifter Bracket For AX5 5 Speed Transmission

$36.99
Outer Transmission and Transfer Case Shift Boot fits Jeep Wrangler YJ 1987-1995

Outer Transmission and Transfer Case Shift Boot fits Jeep Wrangler YJ 1987-1995

$69.99
1997-2002 Jeep Wrangler Transfer Case NP231 5sp 2.5L Manual 4 Cylinder

1997-2002 Jeep Wrangler Transfer Case NP231 5sp 2.5L Manual 4 Cylinder

$374.99
Transfer Case Vehicle Speed Sensor Jeep 1990 To 1991 Yj Wrangler Crown 56027015

Transfer Case Vehicle Speed Sensor Jeep 1990 To 1991 Yj Wrangler Crown 56027015

$49.40
29 Spline Yoke Jeep 87 To 1995 Yj Wrangler Np207 Np231 Transfer Cases C83502829

29 Spline Yoke Jeep 87 To 1995 Yj Wrangler Np207 Np231 Transfer Cases C83502829

$35.15
Transfer Case Chain for Jeep Wrangler Cherokee TJ XJ YJ NP231 NP233 11650

Transfer Case Chain for Jeep Wrangler Cherokee TJ XJ YJ NP231 NP233 11650

$79.99
Alloy USA 11400 Transfer Case Slip Yoke Eliminator Kit fits 87-06 Wrangler YJ/TJ

Alloy USA 11400 Transfer Case Slip Yoke Eliminator Kit fits 87-06 Wrangler YJ/TJ

$259.99
1987-90 JEEP YJ WRANGLER BA10 PEUGEOT TRANSFER CASE SHIFTER

1987-90 JEEP YJ WRANGLER BA10 PEUGEOT TRANSFER CASE SHIFTER

$29.00
Jeep Wrangler TJ YJ TRANSFER CASE NUT AND BOLT 87-02

Jeep Wrangler TJ YJ TRANSFER CASE NUT AND BOLT 87-02

$4.95
Jeep Wrangler YJ 87-95  Transfer Case Tail Shaft Housing NP 231

Jeep Wrangler YJ 87-95 Transfer Case Tail Shaft Housing NP 231

$40.00
JEEP WRANGLER YJ 87-95 2.5 4 CYL AX5 TRANSFER CASE SHIFT LEVER SEE AD

JEEP WRANGLER YJ 87-95 2.5 4 CYL AX5 TRANSFER CASE SHIFT LEVER SEE AD

$46.99
Output shaft oil seal NP231 Transfer Case fits Jeep Wrangler TJ YJ Cherokee XJ

Output shaft oil seal NP231 Transfer Case fits Jeep Wrangler TJ YJ Cherokee XJ

$8.99
NP231 Transfer Case Front Output Seal Jeep Wrangler YJ Cherokee XJ 1987-1995

NP231 Transfer Case Front Output Seal Jeep Wrangler YJ Cherokee XJ 1987-1995

$12.99
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

$129.43
 NP231 Rear Transfer Case Housing Extension for Jeep Wrangler Cherokee  83503156

NP231 Rear Transfer Case Housing Extension for Jeep Wrangler Cherokee 83503156

$40.96

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