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.

Jeep Wrangler TJ NP231 Transfercase Drive Shift Collar  97-06 Transfer Case

Jeep Wrangler TJ NP231 Transfercase Drive Shift Collar 97-06 Transfer Case

$34.95
Jeep Wrangler TJ NP231 Transfercase Shift Range Collar Gear 97-06 Transfer Case

Jeep Wrangler TJ NP231 Transfercase Shift Range Collar Gear 97-06 Transfer Case

$34.95
NEW Crown Automotive Transfer Case Slip Yoke 87-95 Wrangler YJ Jeep Free Ship af

NEW Crown Automotive Transfer Case Slip Yoke 87-95 Wrangler YJ Jeep Free Ship af

$66.70
Jeep Transfer Case Chain Wrangler Cherokee Grand Cherokee Liberty NP 231 233

Jeep Transfer Case Chain Wrangler Cherokee Grand Cherokee Liberty NP 231 233

$64.50
Crown Automotive 83502855 Transfer Case Slip Yoke Fits 87-95 Wrangler (YJ)

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

$60.56
4.0 NP231J transfer case jeep wrangler (short/23 spline) 87-95

4.0 NP231J transfer case jeep wrangler (short/23 spline) 87-95

$385.00
Rubicon Express RE2100 Transfer Case Lowering Kit TJ Wrangler (TJ) Wrangler (YJ)

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

$50.71
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)

$119.99
Jeep Wrangler TJ, Cherokee XJ, NP231J 23 Spline Transfer Case Short Input 97-03

Jeep Wrangler TJ, Cherokee XJ, NP231J 23 Spline Transfer Case Short Input 97-03

$247.50
Omix-Ada 18676.17 Transfer Case Shift Fork Fits Wrangler (TJ) Wrangler (YJ)

Omix-Ada 18676.17 Transfer Case Shift Fork Fits Wrangler (TJ) Wrangler (YJ)

$65.70
Omix-Ada 18676.01 Transfer Case Input Bearing Retainer Kit Fits Wrangler (YJ)

Omix-Ada 18676.01 Transfer Case Input Bearing Retainer Kit Fits Wrangler (YJ)

$78.05
Omix-Ada 18676.04 Transfer Case Input Gear Bearing Fits 87-95 Wrangler (YJ)

Omix-Ada 18676.04 Transfer Case Input Gear Bearing Fits 87-95 Wrangler (YJ)

$63.59
Omix-Ada 18676.29 Transfer Case Output Seal Fits 87-95 Wrangler (YJ)

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

$29.00
Omix-Ada 18676.28 Transfer Case Mainshaft Bushing Fits 87-95 Wrangler (YJ)

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

$32.42
Omix-Ada 18676.37 Transfer Case Yoke Fits 87-95 Wrangler (YJ)

Omix-Ada 18676.37 Transfer Case Yoke Fits 87-95 Wrangler (YJ)

$56.54
Omix-Ada 18676.44 Transfer Case Maindrive Sprocket Bearing Fits Wrangler (YJ)

Omix-Ada 18676.44 Transfer Case Maindrive Sprocket Bearing Fits Wrangler (YJ)

$37.08
Omix-Ada 18676.50 Transfer Case Output Shaft Fits Wrangler (TJ) Wrangler (YJ)

Omix-Ada 18676.50 Transfer Case Output Shaft Fits Wrangler (TJ) Wrangler (YJ)

$158.04
Omix-Ada 18676.26 Transfer Case Shift Fork Fits 87-93 Wrangler (YJ)

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

$63.91
Omix-Ada 18676.25 Transfer Case Housing Case Extension Fits 87-95 Wrangler (YJ)

Omix-Ada 18676.25 Transfer Case Housing Case Extension Fits 87-95 Wrangler (YJ)

$61.93
Omix-Ada 18676.36 Transfer Case Output Yoke Nut Fits Wrangler (TJ) Wrangler (YJ)

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

$32.56

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