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 Jeep Wrangler YJ 1987-95 18676.29 4638904

NP231 Transfer Case Output Seal Rear Jeep Wrangler YJ 1987-95 18676.29 4638904

$8.44
Crown Automotive 83502829 Transfer Case Yoke Fits 87-95 Wrangler (YJ)

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

$53.02
New Repacement Transfer Case Chain 11650 NP231/NP233 Jeep Wrangler Cherokee 027

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

$62.24
G2 Axle and Gear 37-231 Transfer Case Kit Fits 87-94 Cherokee (XJ) Wrangler (YJ)

G2 Axle and Gear 37-231 Transfer Case Kit Fits 87-94 Cherokee (XJ) Wrangler (YJ)

$103.00
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)

$143.61
Rugged Ridge Transfer Case Mount Red Jeep Cj Wrangler Yj 72-95 X 18392.01

Rugged Ridge Transfer Case Mount Red Jeep Cj Wrangler Yj 72-95 X 18392.01

$60.99
Rugged Ridge Transfer Case Lowering Kit Jeep Wrangler Yj Tj Lj 87-06 X 18305.10

Rugged Ridge Transfer Case Lowering Kit Jeep Wrangler Yj Tj Lj 87-06 X 18305.10

$44.99
Jeep Wrangler YJ NP231 Transfercase Shift Drive Collar Gear 87-95 Transfer Case

Jeep Wrangler YJ NP231 Transfercase Shift Drive Collar Gear 87-95 Transfer Case

$34.95
1989 89 1990 90 Jeep Wrangler Transfer Case 4 Cyl NP231

1989 89 1990 90 Jeep Wrangler Transfer Case 4 Cyl NP231

$432.00
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
87-90 JEEP WRANGLER 4.2 6 cyl AUTO TRANS TRANSFER CASE FLOOR SHIFTER ASSEMBLY

87-90 JEEP WRANGLER 4.2 6 cyl AUTO TRANS TRANSFER CASE FLOOR SHIFTER ASSEMBLY

$100.00
Jeep Wrangler TJ YJ TRANSFER CASE NUTS 87-02

Jeep Wrangler TJ YJ TRANSFER CASE NUTS 87-02

$3.95
OEM Jeep Wrangler YJ Transfer case 4x4 Shifter Shift Assembly automatic 551

OEM Jeep Wrangler YJ Transfer case 4x4 Shifter Shift Assembly automatic 551

$40.00
JEEP WRANGLER TJ  97-03  NP 231 J TRANSFER CASE  272 ratio 23 spline long input

JEEP WRANGLER TJ 97-03 NP 231 J TRANSFER CASE 272 ratio 23 spline long input

$380.00
Omix-Ada 18612.02 Transfer Case Drive Chain Fits Cherokee (XJ) Wrangler (YJ)

Omix-Ada 18612.02 Transfer Case Drive Chain Fits Cherokee (XJ) Wrangler (YJ)

$124.80
Omix-ADA Shift Fork Pad Set for NP231 Transfer Case Fits 87-90 Wrangler YJ

Omix-ADA Shift Fork Pad Set for NP231 Transfer Case Fits 87-90 Wrangler YJ

$7.91
 Jeep Wrangler YJ OEM Transfer Case Shifter automatic transmission  210

Jeep Wrangler YJ OEM Transfer Case Shifter automatic transmission 210

$31.99
93-95 JEEP WRANGLER YJ 2.5L TRANSFER CASE

93-95 JEEP WRANGLER YJ 2.5L TRANSFER CASE

$499.99
Crown Automotive 83503572 Transfer Case 87-89 Wrangler (YJ)

Crown Automotive 83503572 Transfer Case 87-89 Wrangler (YJ)

$229.02
Crown Automotive 83502829 Transfer Case Yoke 87-95 Fits Wrangler (YJ)

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

$40.34

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