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.

Outer Manual Transmission and Transfer Case Shift Boot fits Jeep Wrangler YJ

Outer Manual Transmission and Transfer Case Shift Boot fits Jeep Wrangler YJ

$69.99
Shift Fork NP231 Transfer Case for Jeep Cherokee Wrangler 1988-96 18676.26 Omix

Shift Fork NP231 Transfer Case for Jeep Cherokee Wrangler 1988-96 18676.26 Omix

$56.70
Jeep TJ Wrangler OEM NP231J Transfer Case Shifter Lever and Linkage 2006 9782

Jeep TJ Wrangler OEM NP231J Transfer Case Shifter Lever and Linkage 2006 9782

$76.50
Rear Drive Shaft 2.5L AUTOMATIC DANA 35 Np 231 Transfer Case 1998 WRANGLER

Rear Drive Shaft 2.5L AUTOMATIC DANA 35 Np 231 Transfer Case 1998 WRANGLER

$129.95
Transfer Case Oil Pump For Jeep 1997 To 2006 TJ Wrangler NP231 CR-4338936

Transfer Case Oil Pump For Jeep 1997 To 2006 TJ Wrangler NP231 CR-4338936

$40.83
Drive Sprocket NP231 Transfer Case For Jeep 1987 To 1990 YJ Wrangler CR-4338929

Drive Sprocket NP231 Transfer Case For Jeep 1987 To 1990 YJ Wrangler CR-4338929

$85.72
Seal For Jeep 1987 To 1990 YJ Wrangler NP231 Transfer Case CR-J8130870

Seal For Jeep 1987 To 1990 YJ Wrangler NP231 Transfer Case CR-J8130870

$3.41
Transfer Case Chain NP207 for Jeep Cherokee Wrangler 1984-1987 18612.02 Omix-ADA

Transfer Case Chain NP207 for Jeep Cherokee Wrangler 1984-1987 18612.02 Omix-ADA

$103.99
NP231J Jeep Transfer Case Rear Tail Housing Retainer 97-06 TJ,XJ (Wrangler)

NP231J Jeep Transfer Case Rear Tail Housing Retainer 97-06 TJ,XJ (Wrangler)

$55.95
JEEP WRANGLER TJ 97-03 NP 231J TRANSFER CASE 23 Spline Long Input FREE SHIP

JEEP WRANGLER TJ 97-03 NP 231J TRANSFER CASE 23 Spline Long Input FREE SHIP

$250.00
Jeep Wrangler TJ,YJ, Cherokee Transfer Case Mounting Stud.NP 231, 241,247,  OEM.

Jeep Wrangler TJ,YJ, Cherokee Transfer Case Mounting Stud.NP 231, 241,247, OEM.

$10.99
Jeep Wrangler Transfer Case NP231J 2.5 Liter 4 Cylinder YJ 21 Spline T-Case OEM

Jeep Wrangler Transfer Case NP231J 2.5 Liter 4 Cylinder YJ 21 Spline T-Case OEM

$549.99
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
Jeep Wrangler TJ Transfercase NP231 5sp 4.0L Manual Automatic 97-02 transfer 02i

Jeep Wrangler TJ Transfercase NP231 5sp 4.0L Manual Automatic 97-02 transfer 02i

$349.95
Jeep Wrangler TJ Transfercase NP231 5sp 4.0L Manual Automatic 97-02 transfer 99a

Jeep Wrangler TJ Transfercase NP231 5sp 4.0L Manual Automatic 97-02 transfer 99a

$349.95
Jeep TJ LJ NP231 Transfer Case Cable Shifter Kit LASER CUT- Wrangler 1997-2006

Jeep TJ LJ NP231 Transfer Case Cable Shifter Kit LASER CUT- Wrangler 1997-2006

$144.99
87-90 WRANGLER COMANCHE CHEROKEE WITN NP231 TRANSFER CASE SHIFT RAIL BUSHING

87-90 WRANGLER COMANCHE CHEROKEE WITN NP231 TRANSFER CASE SHIFT RAIL BUSHING

$21.61
2003-2006 WRANGLER NVG241 2002 LIBERTY NP231 NP242 1 TRANSFER CASE MOUNTING STUD

2003-2006 WRANGLER NVG241 2002 LIBERTY NP231 NP242 1 TRANSFER CASE MOUNTING STUD

$21.98
Omix-Ada 18676.25 NP231 Transfer Case Housing Extension for 87-95 Wrangler YJ

Omix-Ada 18676.25 NP231 Transfer Case Housing Extension for 87-95 Wrangler YJ

$62.32
Omix-Ada 18676.15 NP231 Transfer Case 4WD Light Switch for Wrangler/Cherokee

Omix-Ada 18676.15 NP231 Transfer Case 4WD Light Switch for Wrangler/Cherokee

$62.71

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