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.

Teraflex 2104400 Low 231 HD Transfer Case 88-02 Jeep Wrangler Jeep Wrangler (YJ)

Teraflex 2104400 Low 231 HD Transfer Case 88-02 Jeep Wrangler Jeep Wrangler (YJ)

$1,265.39
Teraflex 2104400 Low 231 HD Transfer Case 88-02 TJ Wrangler (TJ) Wrangler (YJ)

Teraflex 2104400 Low 231 HD Transfer Case 88-02 TJ Wrangler (TJ) Wrangler (YJ)

$1,570.71
Jeep YJ 87-95 Wrangler ★ 231J TRANSFER CASE 272 21 Spline Count Short Input

Jeep YJ 87-95 Wrangler ★ 231J TRANSFER CASE 272 21 Spline Count Short Input

$409.95
Omix-Ada 18676.28 Transfer Case Mainshaft Bushing 87-95 Wrangler (YJ)

Omix-Ada 18676.28 Transfer Case Mainshaft Bushing 87-95 Wrangler (YJ)

$22.86
Rubicon Express RE2100 Transfer Case Lowering Kit Wrangler (TJ) Wrangler (YJ)

Rubicon Express RE2100 Transfer Case Lowering Kit Wrangler (TJ) Wrangler (YJ)

$56.81
Jeep Wrangler YJ, 1992-1995  TRANSFER CASE HARNESS Wiring Axle Actuator

Jeep Wrangler YJ, 1992-1995 TRANSFER CASE HARNESS Wiring Axle Actuator

$34.95
Jeep Wrangler TJ NP231 21 spline Transfer Case '97' to '02'

Jeep Wrangler TJ NP231 21 spline Transfer Case '97' to '02'

$250.00
Jeep Wrangler YJ NP231 21 spline Transfer Case '87' to '95'

Jeep Wrangler YJ NP231 21 spline Transfer Case '87' to '95'

$250.00
Teraflex 2104400 Low 231 HD Transfer Case 88-02 TJ Wrangler (TJ) Wrangler (YJ)

Teraflex 2104400 Low 231 HD Transfer Case 88-02 TJ Wrangler (TJ) Wrangler (YJ)

$1,639.79
00 01 02 Jeep Wrangler AT NP231 Transfer Case 95K OEM

00 01 02 Jeep Wrangler AT NP231 Transfer Case 95K OEM

$245.08
★ Jeep YJ 87-95 Wrangler - TRANSFER CASE VACCUM SWITCH | NP231 NP207 4X4

★ Jeep YJ 87-95 Wrangler - TRANSFER CASE VACCUM SWITCH | NP231 NP207 4X4

$24.95
S-52098358 Omix-ADA Transfer Case (4.0L w/Manual) NP 231 JEEP Wrangler 1994-1995

S-52098358 Omix-ADA Transfer Case (4.0L w/Manual) NP 231 JEEP Wrangler 1994-1995

$1,345.00
Rubicon Express RE2100 Transfer Case Lowering Kit Wrangler (TJ) Wrangler (YJ)

Rubicon Express RE2100 Transfer Case Lowering Kit Wrangler (TJ) Wrangler (YJ)

$55.06
NP231 Transfercase Shifter AX-5 Wrangler Jeep AX5 87-95 YJ NP 231 Transfer Case

NP231 Transfercase Shifter AX-5 Wrangler Jeep AX5 87-95 YJ NP 231 Transfer Case

$40.00
Omix-Ada 18676.29 Transfer Case Output Seal 87-95 Wrangler (YJ)

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

$12.14
Jeep Wrangler YJ transfer case shifter, AX5  5spd.  OEM

Jeep Wrangler YJ transfer case shifter, AX5 5spd. OEM

$89.99
93-06 JEEP WRANGLER TJ YJ TRANSFER CASE SPEED SENSOR GEAR 40 TEETH ORANGE NP231

93-06 JEEP WRANGLER TJ YJ TRANSFER CASE SPEED SENSOR GEAR 40 TEETH ORANGE NP231

$31.50
Rugged Ridge 18676.74 - Wrangler Transfer Case Bearing for Transfer Case NP 231

Rugged Ridge 18676.74 - Wrangler Transfer Case Bearing for Transfer Case NP 231

$18.99
NP231J 21 Spline Transfer Case, Short, 2.5L 4cyl, Jeep Wrangler TJ 97-02, O10

NP231J 21 Spline Transfer Case, Short, 2.5L 4cyl, Jeep Wrangler TJ 97-02, O10

$217.50
Rubicon Express RE2100 Transfer Case Lowering Kit TJ Wrangler (TJ) Wrangler (YJ)

Rubicon Express RE2100 Transfer Case Lowering Kit TJ Wrangler (TJ) Wrangler (YJ)

$44.99

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