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.

Rugged Ridge 18305.10 Transfer Case Lowering Kit for Jeep Wrangler TJ/LJ/YJ

Rugged Ridge 18305.10 Transfer Case Lowering Kit for Jeep Wrangler TJ/LJ/YJ

$50.41
NP231 Transfer Case Electric Vacuum Switch for Jeep Wrangler & Cherokee 1988-01

NP231 Transfer Case Electric Vacuum Switch for Jeep Wrangler & Cherokee 1988-01

$24.99
NP207 Transfer Case Output Seal fits Jeep Wrangler YJ and Cherokee XJ

NP207 Transfer Case Output Seal fits Jeep Wrangler YJ and Cherokee XJ

$9.99
1991 Jeep Wrangler YJ NP 231J Transfer Case 23 Spline 6 CYL Manual, 4.0L

1991 Jeep Wrangler YJ NP 231J Transfer Case 23 Spline 6 CYL Manual, 4.0L

$379.00
FITS 94-95 WRANGLER 94-96 CHEROKEE 4.0L W/NP231 TRANSFER CASE HOUSING EXTENSION

FITS 94-95 WRANGLER 94-96 CHEROKEE 4.0L W/NP231 TRANSFER CASE HOUSING EXTENSION

$58.52
Jeep TJ Wrangler NP231J Transfer Case Shifter Lever and LInkage 03-06 8873

Jeep TJ Wrangler NP231J Transfer Case Shifter Lever and LInkage 03-06 8873

$72.00
Jeep TJ Wrangler Transfer Case Model NP231J Manual Trans P52111252AD 00-02 13987

Jeep TJ Wrangler Transfer Case Model NP231J Manual Trans P52111252AD 00-02 13987

$180.00
Jeep Wrangler YJ Transfercase Chevy GM 700R4 Automatic NP231 87-95 transfer 94s

Jeep Wrangler YJ Transfercase Chevy GM 700R4 Automatic NP231 87-95 transfer 94s

$599.95
Jeep Wrangler TJ Transfercase NP231 5sp 2.5L Manual 97-02 4 cyl transfer 01p

Jeep Wrangler TJ Transfercase NP231 5sp 2.5L Manual 97-02 4 cyl transfer 01p

$339.95
87-95 Jeep wrangler 231 front drive shaft output Yolk YJ transfer case

87-95 Jeep wrangler 231 front drive shaft output Yolk YJ transfer case

$20.00
Omix-ADA 18676.26 NP231 Transfer Case Shift Fork for Jeep Cherokee/Wrangler

Omix-ADA 18676.26 NP231 Transfer Case Shift Fork for Jeep Cherokee/Wrangler

$56.45
Omix-ADA 18676.23 NP231 Transfer Case Shift Fork Pad Set for 87-90 Jeep Wrangler

Omix-ADA 18676.23 NP231 Transfer Case Shift Fork Pad Set for 87-90 Jeep Wrangler

$26.43
G2 Axle & Gear 37-231 NP231 Transfer Case Rebuild Kit, For 1987-1994 Wrangler YJ

G2 Axle & Gear 37-231 NP231 Transfer Case Rebuild Kit, For 1987-1994 Wrangler YJ

$103.99
Omix-Ada Transfer Case Drive Sprocket NP231 for Jeep Wrangler TJ 1997-1999

Omix-Ada Transfer Case Drive Sprocket NP231 for Jeep Wrangler TJ 1997-1999

$117.26
97-06 WRANGLER W/NP231 TRANSFER 96-01 CHEROKEE 2.5 4.0 DRIVE SHAFT SLIP YOKE

97-06 WRANGLER W/NP231 TRANSFER 96-01 CHEROKEE 2.5 4.0 DRIVE SHAFT SLIP YOKE

$74.95
1987-1989 WRANGLER W/NP231 T-CASE & VACUUM SWITCH HOLE FRONT HALF TRANSFER CASE

1987-1989 WRANGLER W/NP231 T-CASE & VACUUM SWITCH HOLE FRONT HALF TRANSFER CASE

$230.30
FIT 97-06 WRANGLER 91-01 CHEROKEE 02-07 LIBERTY W/NP231 TRANSFER CASE SHIFT FORK

FIT 97-06 WRANGLER 91-01 CHEROKEE 02-07 LIBERTY W/NP231 TRANSFER CASE SHIFT FORK

$77.10
91-95 Jeep Wrangler YJ 21 Spline TRANSFER CASE 231J 5-SPEED 2.5L 4 Cylinder

91-95 Jeep Wrangler YJ 21 Spline TRANSFER CASE 231J 5-SPEED 2.5L 4 Cylinder

$249.99
Jeep TJ Wrangler OEM NP231J Transfer Case Shifter Lever and Linkage 03-06 11449

Jeep TJ Wrangler OEM NP231J Transfer Case Shifter Lever and Linkage 03-06 11449

$72.00
JEEP WRANGLER TJ 97-03 NP 231J TRANSFER CASE 23 Spline Long Input Auto FREE SHIP

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

$299.00

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