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.

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
Omix-Ada 18676.36 Transfer Case Output Yoke Nut TJ Wrangler (TJ) Wrangler (YJ)

Omix-Ada 18676.36 Transfer Case Output Yoke Nut TJ Wrangler (TJ) Wrangler (YJ)

$22.21
Rubicon Express RE2100 Transfer Case Lowering Kit TJ Wrangler (TJ) Wrangler (YJ)

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

$51.29
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)

$1,789.73
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
Crown Automotive 83502855 Transfer Case Slip Yoke Fits 87-95 Wrangler (YJ)

Crown Automotive 83502855 Transfer Case Slip Yoke Fits 87-95 Wrangler (YJ)

$63.08
1997-01-02-03-04-06 Jeep Wrangler TJ NP231 Transfer case Gear

1997-01-02-03-04-06 Jeep Wrangler TJ NP231 Transfer case Gear

$49.04
1997-01-02-03-04-06 Jeep Wrangler TJ NP231 Transfer case Part

1997-01-02-03-04-06 Jeep Wrangler TJ NP231 Transfer case Part

$49.04
1997-01-02-03-04-06 Jeep Wrangler TJ NP231 Transfer case Sending Unit Clamp

1997-01-02-03-04-06 Jeep Wrangler TJ NP231 Transfer case Sending Unit Clamp

$19.04
Jeep Wrangler  NP231 Transfer case Planetary Gear.  4.0L 23 spline. OEM

Jeep Wrangler NP231 Transfer case Planetary Gear. 4.0L 23 spline. OEM

$125.00
Crown Automotive 83502855 Transfer Case Slip Yoke 87-95 Wrangler YJ

Crown Automotive 83502855 Transfer Case Slip Yoke 87-95 Wrangler YJ

$59.94
Crown Automotive 83502855 Transfer Case Slip Yoke Fits 87-95 Wrangler (YJ)

Crown Automotive 83502855 Transfer Case Slip Yoke Fits 87-95 Wrangler (YJ)

$71.25
J0945266 Crown Automotive Transfer Case Engine Mount Insulator Jeep Wrangler CJ

J0945266 Crown Automotive Transfer Case Engine Mount Insulator Jeep Wrangler CJ

$5.00
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)

$1,719.49
New OEM Mopar 53002033 Transfer Case Vacuum Harness 87-90 YJ Jeep Wrangler 231

New OEM Mopar 53002033 Transfer Case Vacuum Harness 87-90 YJ Jeep Wrangler 231

$42.95
Jeep Wrangler YJ Cherokee XJ Vacuum Motor Replacement Kit for Transfer Case

Jeep Wrangler YJ Cherokee XJ Vacuum Motor Replacement Kit for Transfer Case

$89.99
4638904 Crown Automotive Transfer Case Output Seal NP242/NP231 Jeep Wrangler

4638904 Crown Automotive Transfer Case Output Seal NP242/NP231 Jeep Wrangler

$7.00
J3241239 Crown Automotive Transfer Case Shift Lever Clip Jeep Wrangler CJ

J3241239 Crown Automotive Transfer Case Shift Lever Clip Jeep Wrangler CJ

$8.00
Jeep Cherokee Wrangler 1987-1996 NP231 Transfer Case Replacement Synchronizer

Jeep Cherokee Wrangler 1987-1996 NP231 Transfer Case Replacement Synchronizer

$139.99
Crown Automotive 83502855 Transfer Case Slip Yoke Fits 87-95 Wrangler (YJ)

Crown Automotive 83502855 Transfer Case Slip Yoke Fits 87-95 Wrangler (YJ)

$61.13

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