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.

1987 Jeep Wrangler YJ NP 207 Transfer Case With 2.6:1 Low Range Ratio 4.2L AT

1987 Jeep Wrangler YJ NP 207 Transfer Case With 2.6:1 Low Range Ratio 4.2L AT

$400.00
Rubicon Express RE2100 Transfer Case Lowering Kit Wrangler (TJ) Wrangler (YJ)

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

$51.37
Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

$65.79
Omix-Ada 18676.26 Transfer Case Mode Shift Fork 87-93 Wrangler (YJ)

Omix-Ada 18676.26 Transfer Case Mode Shift Fork 87-93 Wrangler (YJ)

$62.55
Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

$67.13
Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

$62.24
Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

$51.31
Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

$68.99
Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

Omix-Ada 18676.26 Transfer Case Shift Fork 87-93 Wrangler (YJ)

$59.21
1997-01-02-03-04-06 Jeep Wrangler TJ NP231 Transfer case Shift Collar Gear

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

$45.04
Transfer Case Slip-Yoke Eliminator Kit 87-06 Wrangler with NP231 Transfer Case

Transfer Case Slip-Yoke Eliminator Kit 87-06 Wrangler with NP231 Transfer Case

$189.87
2003 Jeep Wrangler Transfer Case Rebuilt NP231 with AA SYE 23 Spline 4.0L

2003 Jeep Wrangler Transfer Case Rebuilt NP231 with AA SYE 23 Spline 4.0L

$1,100.00
Jeep Wrangler Transfer Case Rebuilt NP231 23 Spline 4.0L

Jeep Wrangler Transfer Case Rebuilt NP231 23 Spline 4.0L

$1,000.00
JEEP WRANGLER YJ BA-10 TRANSFER CASE SHIFTER 87-89

JEEP WRANGLER YJ BA-10 TRANSFER CASE SHIFTER 87-89

$55.00
Trailmaster JYTCS Transfer Case Drop Bracket TJ Wrangler (TJ) Wrangler (YJ)

Trailmaster JYTCS Transfer Case Drop Bracket TJ Wrangler (TJ) Wrangler (YJ)

$63.26
Jeep Wrangler YJ 21 spline Transfer Case 1987-1989 4 & 6 Cylinder manual trans.

Jeep Wrangler YJ 21 spline Transfer Case 1987-1989 4 & 6 Cylinder manual trans.

$199.99
Pro Comp Suspension TailShaft Conversion Kit 87-95 Wrangler YJ Transfer Case ic

Pro Comp Suspension TailShaft Conversion Kit 87-95 Wrangler YJ Transfer Case ic

$335.21
Jeep Wrangler  NP231 Transfer case Input Bearing Retainer  87-06  OEM

Jeep Wrangler NP231 Transfer case Input Bearing Retainer 87-06 OEM

$23.00
Jeep Wrangler  NP231 Transfer case Rear Bearing Sending Unit Housing 87-95

Jeep Wrangler NP231 Transfer case Rear Bearing Sending Unit Housing 87-95

$35.00
Jeep Wrangler  NP231 Transfer case Parts.   OEM

Jeep Wrangler NP231 Transfer case Parts. OEM

$100.00

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