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.

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

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

$458.15
Jeep NP242 & Wrangler TJ NP231 (1997-02) Transfer Case Output Shaft Seal

Jeep NP242 & Wrangler TJ NP231 (1997-02) Transfer Case Output Shaft Seal

$12.99
Rubicon Express RE2100 Transfer Case Lowering Kit TJ Wrangler (TJ) Wrangler (YJ)

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

$56.81
JEEP WRANGLER YJ 87-95 4 SPD TRANS & TRANSFER SHIFT KNOB KIT FREE SHIPPING NEW

JEEP WRANGLER YJ 87-95 4 SPD TRANS & TRANSFER SHIFT KNOB KIT FREE SHIPPING NEW

$26.99
JEEP WRANGLER YJ 1987 -1995 TRANSFER SHIFT KNOB NP 231

JEEP WRANGLER YJ 1987 -1995 TRANSFER SHIFT KNOB NP 231

$14.75
JEEP WRANGLER YJ 87-95 5 SPD TRANS & TRANSFER SHIFT KNOB KIT NEW FREE SHIPPING

JEEP WRANGLER YJ 87-95 5 SPD TRANS & TRANSFER SHIFT KNOB KIT NEW FREE SHIPPING

$26.99
JEEP WRANGLER YJ 1987 -1995 TRANSFER SHIFT KNOB NP 231

JEEP WRANGLER YJ 1987 -1995 TRANSFER SHIFT KNOB NP 231

$14.95
★ Jeep YJ 87-95 Wrangler - 4.2 TRANSFER CASE SHIFTER || Automatic Shift 4x4

★ Jeep YJ 87-95 Wrangler - 4.2 TRANSFER CASE SHIFTER || Automatic Shift 4x4

$49.95
★ 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

$1,237.50
87-90 4x4 shifter Jeep Wrangler 231 transfer case YJ 5 speed trans stick

87-90 4x4 shifter Jeep Wrangler 231 transfer case YJ 5 speed trans stick

$39.99
Rubicon Express RE2100 Transfer Case Lowering Kit TJ Wrangler (TJ) Wrangler (YJ)

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

$55.06
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)

$1,747.16
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

$29.75
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

$23.26
87-90 4x4 shifter Jeep Wrangler 231 transfer case YJ 5 speed trans stick BA10

87-90 4x4 shifter Jeep Wrangler 231 transfer case YJ 5 speed trans stick BA10

$75.00
Omix-Ada 18676.23 Transfer Case Shift Fork Pad Set NP231 87-90 Jeep Wrangler

Omix-Ada 18676.23 Transfer Case Shift Fork Pad Set NP231 87-90 Jeep Wrangler

$4.76
18676.57 Omix-ADA Mainshaft JEEP Wrangler 94-99 Cherokee 1997-99 NP231 Transfer

18676.57 Omix-ADA Mainshaft JEEP Wrangler 94-99 Cherokee 1997-99 NP231 Transfer

$299.48
DTPLV NP 231 Transfer Case Chain Jeep NEW NP231 Liberty Wrangler

DTPLV NP 231 Transfer Case Chain Jeep NEW NP231 Liberty Wrangler

$59.98
Morse NP 231 Transfer Case Chain HV027 Jeep NEW NP231 Liberty Wrangler Cloyes

Morse NP 231 Transfer Case Chain HV027 Jeep NEW NP231 Liberty Wrangler Cloyes

$71.88

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