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.

Teraflex 2104400 Low 231 HD Transfer Case 88-02 Jeep Wrangler Jeep Wrangler (YJ)

Teraflex 2104400 Low 231 HD Transfer Case 88-02 Jeep Wrangler Jeep Wrangler (YJ)

$1,265.39

"NEW" JEEP YJ XJ WRANGLER NP231 TRANSFER CASE EXTENSION TAILHOUSING RETAINER

$39.95
★ Jeep YJ 91-95 Wrangler - 231 J TRANSFER CASE || 272 * 21 Spline Count

★ Jeep YJ 91-95 Wrangler - 231 J TRANSFER CASE || 272 * 21 Spline Count

$350.00
89 90 JEEP WRANGLER Transfer Case model NP 231 6 cyl MT 0110161

89 90 JEEP WRANGLER Transfer Case model NP 231 6 cyl MT 0110161

$360.00
Trailmaster JYTCS Transfer Case Drop Bracket TJ Wrangler (TJ) Wrangler (YJ)

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

$67.90
Jeep Wrangler NP 231 21 spline Transfer Case Input Shaft

Jeep Wrangler NP 231 21 spline Transfer Case Input Shaft

$50.00
JEEP WRANGLER YJ 87-89 WITH NP231 TRANSFER CASE FRONT CASE HALF SEE DESC

JEEP WRANGLER YJ 87-89 WITH NP231 TRANSFER CASE FRONT CASE HALF SEE DESC

$239.90
Jeep Wrangler YJ 87-95 Transfer Case Shifter Knob #009

Jeep Wrangler YJ 87-95 Transfer Case Shifter Knob #009

$14.99
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)

$20.69
Daystar KJ01008BK Transfer Case Drop Kit 87-02 Wrangler (TJ) Wrangler (YJ)

Daystar KJ01008BK Transfer Case Drop Kit 87-02 Wrangler (TJ) Wrangler (YJ)

$35.50
Rubicon Express RE2100 Transfer Case Lowering Kit TJ Wrangler (TJ) Wrangler (YJ)

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

$45.26
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)

$63.28
Crown Automotive 83502855 Transfer Case Slip Yoke 87-95 Wrangler (YJ)

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

$56.38
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)

$1,590.06
Jeep YJ 87-95 Wrangler ★ TRANSFER CASE SHIFTER KNOB Shift Indicator 2X4 4X4

Jeep YJ 87-95 Wrangler ★ TRANSFER CASE SHIFTER KNOB Shift Indicator 2X4 4X4

$16.95
Jeep Cherokee Wrangler 1987-1996 NP231 Transfer Case Replacement Chain

Jeep Cherokee Wrangler 1987-1996 NP231 Transfer Case Replacement Chain

$119.99
Jeep XJ Cherokee YJ Wrangler NP207 & 231C Transfer Case Chain

Jeep XJ Cherokee YJ Wrangler NP207 & 231C Transfer Case Chain

$121.99
Rubicon Express RE2100 Transfer Case Lowering Kit TJ Wrangler (TJ) Wrangler (YJ)

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

$44.99
Jeep Wrangler TJ NP231 Transfercase Shift Range Fork 97-06 Transfer Case

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

$39.95
Jeep Wrangler YJ NP231 Transfercase Front Output Gear Shaft 87-95 Transfer Case

Jeep Wrangler YJ NP231 Transfercase Front Output Gear Shaft 87-95 Transfer Case

$49.95

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