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 NP231 1997-06 Wrangler TJ Cherokee XJ Transfer Case Electric Vacuum Switch

Jeep NP231 1997-06 Wrangler TJ Cherokee XJ Transfer Case Electric Vacuum Switch

$22.99
Np231 transfer case shifter lever w/ boot n liner for automatic Jeep YJ Wrangler

Np231 transfer case shifter lever w/ boot n liner for automatic Jeep YJ Wrangler

$44.99
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
18676.60 Rugged Ridge NP231 Transfer Case SYE Kit Jeep TJ YJ Wrangler 1988-2006

18676.60 Rugged Ridge NP231 Transfer Case SYE Kit Jeep TJ YJ Wrangler 1988-2006

$210.99
Omix-Ada 18676.29 Transfer Case Output Shaft Oil Seal 87-95 Wrangler (YJ)

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

$18.18
Crown Automotive 83502855 Transfer Case Slip Yoke 87-95 Wrangler (YJ)

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

$67.30
Omix-Ada 18676.29 Transfer Case Output Seal 87-95 Wrangler (YJ)

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

$17.99
Crown Automotive 83502855 Transfer Case Slip Yoke 87-95 Fits Wrangler (YJ)

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

$62.12
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)

$15.28
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)

$16.62
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)

$16.99
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)

$5.45
Omix-Ada 18676.29 Transfer Case Output Seal 87-95 Wrangler (YJ)

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

$18.71
Crown Automotive 83502855 Transfer Case Slip Yoke 87-95 Fits Wrangler (YJ)

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

$61.13
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)

$17.13
Omix-Ada 18676.29 Transfer Case Output Shaft Oil Seal 87-95 Wrangler YJ Rear

Omix-Ada 18676.29 Transfer Case Output Shaft Oil Seal 87-95 Wrangler YJ Rear

$15.54
Crown Automotive 83502855 Transfer Case Slip Yoke 87-95 Wrangler YJ

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

$55.37
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)

$16.47
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

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