NP231 Transfer Case

We have a large inventory of rebuilt NP231 transfer cases plus Transfer Case parts. Our Transfer Cases are factory rebuilt and re-manufactured. We offer free knowledgeable technical support!

Below you will find a detailed list that includes complete NP231 rebuilt Transfer Cases, bearing rebuild kits,(it is recommended that when ordering bearing overhaul kits you also order a small parts kit) gaskets, seals, small parts & thrust washers, bushings individual bearing, forks, hubs and sliders, oil pump, planets, chain, sprockets, shafts input & main, cases housings and miscellaneous parts. If you need more information or cannot find the parts you need give us a call, if you would like to save money, ask about our good take out parts (GTO), they are inspected and guaranteed.

If you would like to save money ask about our good take out parts (GTO), they are inspected and guaranteed. Use our online shopping cart, just click the part number and see additional information, add to cart or proceed to check out. If you need more information or cannot find the parts you need give us a call 888-824-2012.

Our Rebuilt NP231 Transfer Cases are tested before leaving the factory. This transfer case was manufactured by New Venture Gear. This model is chain driven. The NP231 is 4WD with manual shift. The NP231 was used in Chevrolet and GMC small pickups and Jeep. This unit was utilized beginning in 1992.

What is the NP231 Transfer Case

The NP231 was manufactured with left side drop output and has a low gear ratio of 2.72 to 1. This unit has 2WD and 4wd, combination of 2 high, 4 high, neutral and 4 low. The unit has a 27 spline front output and utilizes a rear slip yoke. The NP231 was offered in Chevrolet, Dodge, GMC and Jeep. Some pickups in a heavy duty version with wider chains, sprockets and HD planetary.

NP231 Transfer Case Issues

This unit can have issues with premature chain failure, caused by running the NP231 transfer case on hard surfaces like concrete or asphalt, Run 4WD only on loose dirt, snow, mud, sand or grass as the different wheel speeds in turns can put excessive torque loads on chain and sprockets.

If you have purchased your vehicle used the very first order of business is to double check the tire diameters. Used car dealers may have mismatched the tires to make the sale. Mismatched tires will cause the NP231 transfer case to fail. Recommended fluid for the NP 231 transfer case is automatic transmission fluid (ATF).

We can provide a rebuilt NP231 transfer cases with a 12 month warranty we also offer all parts required to rebuild your unit, we have new parts we can also provide good used takeout parts to save you money!

Free NP231 Transfer Case parts illustration

Below we provide a NP231 parts illustrations to assist you with the correct identification of the parts you need. Upgrade parts are available for the NP231. Select the parts you require from the the list below and give us a call. To speak to a Drive Train Expert or to place and order call toll free 888-824-2012, buy factory direct and save money!

Application Description Model Years

S10 Blazer & Pickup 27 spline input, 32 spline rear output 1992-1997

Dakota 23 spline input, 32 spline rear output 2000-2001

Dakota 23 spline input, 27 spline rear output 1994-1999

Dakota 23 spline input, 26 spline rear output 1988-1996

Durango 23 spline input, 32 spline rear output 2000

Durango 23 spline input, 27 spline rear output 1998-1999

Durango 23 spline input, 32 spline rear output DHD 1998-1999

Ram 1500 Pickup 23 spline input, 32 spline rear output DHD 1994-2000

GMC Jimmy 27 spline input, 32 spline rear output 1994-1997

GMC Sonoma 27 spline input, 32 spline rear output 1992-1997

Jeep Cherokee 23 spline input, 27 spline rear output 1989-2001

Jeep Cherokee 21 spline input, fixed yoke rear output 1989-1990

Jeep Comanche 23 spline input, 27 spline rear output 1989-1992

Jeep Grand Cherokee 23 spline input, 27 spline rear output 1993-1995

Jeep Liberty 23 spline input, 32 spline rear output 2002-Up

Jeep Wrangler 23 spline input, 27 spline rear output 1991-2006

Jeep Wrangler 23 spline input, fixed yoke rear output 1993-2003

This information tag is located on rear of transfer case near where the driveshaft exits. Please supply the assembly number when ordering a replacement.

Need Stronger Parts?

Midwest Transmission can Cryogenic Treat any shaft or gear. This cryo treatment will add 30% in component strength. Call 888-824-2012 for a quote.

REBUILt UNITS

Drawing Image Description Part Number

N.I. Rebuild, 91-93 4CYL NP231 21Spline TCAJ009

N.I. Rebuild, 94-6 Grand Cherokee NP231 STD 23Spline TCAJ010

N.I. Rebuild Cherokee Switch LOC 21 Spline 87-93 TCAJ009

N.I. Rebuild, Cherokee Switch LOC 23 Spline 87-94 NP231 TCAJ010

N.I. Rebuilt, 1994-1996 Ram 1500 TCAJ011

N.I. Rebuilt, 1997-Up Ram and 1500 Dakota TCCRY020

N.I. Rebuilt, 87-UP Dakota NP231 27 Spline CK Switch TCCRY010

N.I. Rebuilt, 88-UP 26 Spline NP231 Dodge Transfer Case TCGM016

N.I. Rebuilt, 88-UP 26 Spline NP231 Dodge Transfer Case TCCRY009

N.I. Rebuilt, 89-92 NP231GM With Electronic TCGM017

N.I. Rebuilt, 94-97 Ram 1500 NP231 Transfer Case TCCRY011

N.I. Rebuilt, 97-UP NP231 Dakota 8CYL Transfer Case TCCRY020

N.I. Rebuilt,2003-2006 Jeep Wrangler 5 speed Manual TCAJ037

BEARING KITS

Drawing Image Description Part Number

N.I. Bearing, Kit 02-UP Jeep Liberty NP231 Transfer Case MWT-231JA

N.I. Bearing Kit 9 5-UP NP231 Narrow Input 6010N MWT-231A

N.I. Bearing Kit 87-94 NP231 BD50-8 Input MWT-231

N.I. Bearing Kit 94-ON NP231 Jeep MWT-231J

small parts

Drawing Image Description Part Number

N.I. Oil Pickup Screen NP231 NP241 NP4338943

N.I. Ring, NP231 Syncro NP4329526

N.I. Small Parts Kit, NP231 NP233 SP231-50

N.I. Small Parts Kit. NP 231 SP231-10

N.I. Switch, 4wd Indicator (3 Prong) MWT15664811

N.I. Switch, 4wd Indicator (4 Prong) MWT15832

N.I. Switch, 4wd Indicator (Electronic) MWT56006755

GASKEts and seals

Drawing Image Description Part Number

N.I. Gasket, Adapter to Transfer Case (GM) 100130

N.I. Oil Pickup Tube O-Ring AS109

N.I. Seal, NP231 Jeep Liberty NP4210603

N.I. Seal, NP231 Liberty 5015847AA

N.I. Seal, 02-UP NP231 Jeep Liberty Transfer Case Kit TSK-231JA

N.I. Seal, Front Output (2.455 in x 1.110 in) MWT11778

35 Seal, Front Output (2.455 in x 1.485 in) 100223

35 Seal, Input 200245

080A Seal, NP207 NP231 Gasket Kit K100907

4 Seal, Pump CR22306

N.I. Seal, Rear 02 Liberty NP231 NP242 NP5072307AA

35 Seal, Rear Output (2.380 in x 1.510 in) NP231 NP233 NP247 NP249 26/27Spline 8850A

12 Dakota 3Bolt Tail (Jeep 2PC) 100223

12 Seal, Rear Output (2.710 in x 1.830 in) Dakota 2 Piece 32 Spline NV22507

12 Seal, Rear Output (2.385 in x 1.430 in) 15041

12 Seal, Rear Output (2.695 in x 1.825 in) MWT22507

12 Seal,Rear Output (2.585 in x 1.090 in) 32Spline Jeep 1PC Rubber Boot NP4798117

N.I. Transmission to Adapter O-Ring (700-R4, 4L60E, TH350, TH350C) MWT26064

bearings

Drawing Image Description Part Number

N.I. Bearing, Drive Sprocket (.940 in Wide) HK5020

16 Bearing, Front Output Shaft (Rear) SCE2416

23 Bearing, Input (.630 Wide) (94-Up) 6010N

23 Bearing, Input (.940 Wide) (87-94) BD50-8

8 Bearing, Output (Rear) (2.833 in OD, .668 in Thick) (94-Up) 6207N

8 Bearing, Output (Rear) (2.439 in OD, .629 in Thick) (87-94) 6206N

9 Bearing, Output retainer Snap Ring (32 Spline Shaft) 1300-139-027

N.I. Bearing, Output Retainer Spline Sleeve (32 Spline Shaft) (Sonnax) MWT100420-02K

N.I. Bearing, Output,Retainer Spline Sleeve (27 Spline Shaft) (Sonnax) MWT100420-01K

N.I. Input Needle Assembly DB59856

9 Output Bearing Retainer Snap Ring (27 Spline Shaft) MWT4446478

forks

Drawing Image Description Part Number

44 Fork, Insert Kit NP15866

41 Fork, Mode (Iron) (Cast # 16196) NV16267

N.I. Fork, Mode Cast# 17769 NP231D 4746136

N.I. Fork, Pad NV4500, NP231 NP4219073

41 Fork, Range (Aluminum) (Cast # 17833). Has Pads NP17833-R

N.I. Fork, Range Bushings (Plastic) 15547404

N.I. Fork,Pad NP241,NP231,NV4500 4167969

41 Mode Fork, Iron (30T) (Cast 17769) (Late Dodge) 4746136

N.I. Range Slider and Hub NP4796906

32 Key and Spring Kit (48T Only) NP208K

32 Mode Assembly (Complete) (48T) NV17915

N.I. Slider, Mode (48T) NV17823-U

N.I. Slider, Mode (60T) NP17773

Synchros

Drawing Image Description Part Number

N.I. Assembly, Syncro NP241 DHD SOME NP231’S NP4746144A

31 Synchro, Mode (48T).small pre 1994 NP4329526

31 Synchro, Mode (60T). 1994-Up MWTNP4745139

5 Pump Assembly MWTNV16209-U

18 Pump Screen (Filter) NP4338943

28 Planet (6 Pinion) (used With .940 Wide Input MWT16550

26 Planet, Thrust Washer (Plastic) NP4338908

N.I. Planet, Upgrade from 3 plant to 5 planet NV17869

N.I. Bolt, Yoke Main Shaft Kit NP231 50-7905

SHAFTS

Drawing Image Description Part Number

27 Input Shaft (Jeep) (21 Spline) (4.30 in) (used With .940 in Wide Input Bearing) MWT16758

27 Input Shaft (Jeep) (23 Spline) (5.30 in) (used With .940 in Wide Input Bearing) MWT17822

N.I. Jeep Slip Yoke Eliminator Short Shaft Conversion Kit: Includes Main Shaft, Yoke, Speedo, Small Parts and Extension Housing / Bearing Support (Bolt Yoke) MWTESYE231

N.I. Shaft, 96 Cherokee NP231 M/S With External Boot NP20362

27 Shaft, Input (Dodge) (23 Spline) (4.30 in) (used With .940 in Wide Input Bearing) NP19061

27 Shaft, Input (Dodge) (23 Spline) (5.30 in) (used With .630 in Wide Input Bearing) NP4796965

2 Shaft, Main (Dodge) (26 Spline) (18 3/8 in) MWT16353

Cases and Housing

Drawing Image Description Part Number

N.I. Case, Front Half 10/17/89-90 NP231D 53008220

N.I. Case, Front Half NP231 83503572

21 Case, Half (Front) (Cast # 16118) MWT20357

3 Case, Half (Rear) (Cast #16117) MWT16721

N.I. Case, NP231 Dodge/GM Rear NP4741242

10 Extension Housing, Slip Yoke (32 Spline, 4 Bolt) MWT17477

N.I. Housing, 4 Bolt Extension NP231 NP241 NP4746150-U

11 Housing, Extension (1.630 in OD) (27 Spline) (GM) MWT35008

11 Housing, Extension (1.700 in OD) (26 and 27 Spline) Dodge 12501A

11 Housing, Extension (2.010 in OD) (32 Spline) (GM) 100408

10 Housing, Extension 5 3/4 in (Cast # 16356) NP4338953

Miscellaneous Parts

Drawing Image Description Part Number

38 Chain, (1.00 in Wide) 31 Links. CL10-027

38 Chain, (1.25 in Wide) 31 Links. CL10-022

1 Drive Sprocket (1.25 in Wide Chain) MWT19043

14 Driven Sprocket (1.25 in Wide Chain) MWT16619

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Minimum order $25.00, Shipping and handling charges will be added.