NP261 Chevrolet and GMC Transfer Case

Take advantage of our NP261 Transfer Case expertise!

Having issues diagnosing problems with your NP261 transfer case? We can help free knowledgeable technical support! To speak to a Drivetrain Expert or to place an order call us toll free 888-824-2012. We have a large inventory of rebuilt NP261 transfer cases plus Transfer Case parts. Our factory rebuilt re-manufactured transfer cases are tested before leaving our factory to ensure quality, saving you both time and money!

Below you will find a detailed list that includes rebuilt re-manufactured NP261 Transfer Cases, a complete parts list including: bearing rebuild kits, 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.

Our rebuilt transfer Cases include all new bearings, gaskets, seals, chains clutch and viscous couplers where used. These units are tested before leaving the factory.

About the NP261 Transfer Case

The NP261 transfer case was manufactured by New Venture Gear. This model is chain driven. The NP261 is 4WD with manual shift. The NP261 was used in Chevrolet and GMC in Silverado’s and GMC Sierra. This unit was utilized beginning in 1999.

The NP261 was manufactured with left side drop output and has a low gear ratio of 2.72 to 1. This unit has combination of 2 high, 4 high, neutral and 4 low. The units are provided with 27, 29, and 32 spline front output and utilizes a rear slip yokes. Some pickups are supplied with heavy duty (HD) and extreme heavy duty (XHD) heavy duty version with wider chains, sprockets and HD planetary.

Potential problems with the NP261 Transfer Case

This unit can have issues with premature case failure caused by the oil pump housing wearing a hole in the case, causing loss of fluid and transfer case failure. Midwest provides a machine case protector plate to solve this problem. A better option is to replace the rear case with the new design shown on the left, don’t leave home without it. Another problem associated with the NP261 transfer case is input and or output bearing wobble wearing out the case. The case material is magnesium, which can build up heat in the unit causing failure of range fork and range hub, we recommend that these items be replaced during the rebuild cycle. The NP261 is also susceptible to problems caused by running the NP261 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 NP261 transfer case to fail. Recommended fluid for the NP261 transfer case is automatic transmission fluid (ATF).

The correct quality parts the first time for your NP261 Transfer Case!

In addition to a rebuilt 12 month warrantied NP261 transfer cases we offer all parts required to rebuild your unit, we have new parts and per your request we can provide good used takeout parts to save you money! Part identification is occasionally a problem and knowing just what parts need to be replaced can be an issue, we can help by identification of associated parts that should be replaced when one part fails. Take advantage of our expertise! Buy parts from Midwest Transmission Center and receive bonus free telephone expertise to assist you in diagnosing the problem, part(s) required and additional phone assistance when you are in the re-assembly processes if required. We have a large inventory of rebuilt NP261 transfer cases plus Transfer Case parts. Our factory rebuilt re-manufactured Transfer Cases are tested before leaving the factory. Save yourself time and money!

Free NP261 Transfer Case parts illustration

We provide a detailed list of rebuilt NP261 units and parts that are available plus detailed assembly illustrations to help you in parts identification and the purchasing phase of the rebuild process. Rebuilt NP261 transfer cases include all new bearings, gaskets, seal, clutch parts, chains and filters. Below we provide a NP261 parts illustrations to assist you with the correct identification of the parts you need. Select the parts you require from the the list below and give us a call 888-824-2012.

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

Midwest Transmission an automotive parts rebulider and remanufacturer
can help you with your NP261 Transfer Case

Midwest transmission has been in the automotive re-manufacturing and rebuilding business for 19 years, and shipping completed units world wide. To improve quality Midwest was one of the first companies to include dyno testing of manual transmission prior to shipping as a final step in the quality control process. We specialize in manual transmissions, automatic transmission and transfer cases. We can help with improving performance and conversions. 22 employees shipped over 9000 units last year. Guaranteed quality and correct parts supplied.

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.

Application Description Model Years
Chevrolet & GM Sierra 2500 & HD 29 Spline input 31 Spline rear 2000-2006
Chevrolet 3500 & HD 32 Spline input 32 Spline rear XHD 2001-2006
Suburban 1500 27 Spline input, rear slip 1999-2004
Suburban 1500 32 Spline input rear slip 1999-2004
Suburban 2500 32 Spline input rear slip LD 1999-2004
Suburban & GM Sierra 2500 32 Spline input rear slip HD 1999-2005
GM Sierra 3500 & HD 29 Spline input 31 Spline rear XHD 2001-2006
Tahoe & Sierra 1500 27 Spline input, 32 rear slip LD 1999-2006
Tahoe & Sierra 1500 32 Spline input rear slip LD 1999-2006
LD Light Duty, HD Heavy Duty, XHD Extreme Duty

Use our online shopping cart, just click the part number and see additional information, add to cart or proceed to check out.

Rebuilt Tested NP261 Transfer Cases 12 Month Warranty

Description Part Number
GM Pickup, Silverado, Yukon 27 Spline Input 1999-Up TCGM035
GM Pickup, Silverado, Yukon 32 Spline Input 1999-Up TCGM036
GM Pickup, Silverado, Yukon 29Spline Input 1999-Up TCGM041
GM Pickup NP261XHD 29 Spline input 31 Spline Output Allison M74 Option 2001-Up TCGM050

Rebuilt Overhaul Bearing Kits NP261 Transfer Case

Description Part Number
NP 261 (32 Spline Output) TRSBK371
NP 261XHD (31 Spline Output) NP261XHD/NP263XHD, 01-up (ZF 6 Spd / Allison Automatic)

Small Parts Kit NP261 Transfer Case

Description Part Number
NP 261, NP 261XHD SP261-50

Gaskets Seals, & Filter NP261 Transfer Case

GASKET & SEAL KITS

Drawing Image Description Part Number
NP263HD Gasket & Seal Kit TSK246
N.I. NP 261 (32 Spline Output) TSK261
N.I. NP 261XHD (31 Spline Output) TRSTSK261XHD

SEALS

Drawing Image Description Part Number
070A Input Seal 200245
081A Front Output Seal 1998-UP (NP 261) (NP 263) Updated GM12547656
074A Rear Output Seal (2.695 inch x 1.825 inch) OE NV22507
074A Rear Output Seal (3.035 inch x 2.125 inch) OE NV21938

FILTERS

Drawing Image Description Part Number
012E Pump Screen (38 Spline Oil Pump) (NP 261) NP4338943
012E Hose & Pump Screen (49 Spline Oil Pump) (NP 261, NP 261XHD) TRS435012

GASTKETS & O-RINGS

Drawing Image Description Part Number
N.I. Adapter to Transfer Case Gasket 100127
311E O-Ring, Pump Pick-Up Tube (38 Spline Pump) (NP 261) TRS401330
311E O-Ring, Pump Pick-Up Tube (49 Spline Pump) (NP 261, NP 261XHD) TRS401330A

Bushings & TH Washers NP261 Transfer Case

BUSHINGS

Drawing Image Description Part Number
066A Bushing Extension Housing (2.340″ OD) OE XHD NV18172
066A Extension Housing (2.010 inch OD) (32 Spline Output) (NP 261) 100408

WASHERS

Drawing Image Description Part Number
215C Planet Thrust Washer (Plastic) (All) TRS411215

Bearings NP261 Transfer Case

Drawing Image Description Part Number
268E Front Output Shaft Bearing (Rear) (.630 inch Wide) 6010
268E Front Output Shaft Bearing (Rear) (.940 inch Wide) HK 5020-U
267C Input Needle Type Pocket Bearing (Inner) DB73167
240C Input Bearing (.630 inch Wide) 6010
210D Output Bearing (Rear) 6208N

Shift Forks NP261 Transfer Case

Drawing Image Description Part Number
850B Mode Fork (Aluminum) (Cast # 28624) (All) w/pads NV27756
849B Range Fork (Aluminum) (Cast # 17833) (All) NP17833-R
840KB Fork insert kit TRS401840K

Hubs & Sliders NP261 Transfer Case

Drawing Image Description Part Number
Mode Sync Assy Slider & Hub NP261 NP263 NV41061
646C Mode Slider 48 Teeth NV17823
645C Range Slider & Hub (NP 261) NP4796906
645C Range Slider & Hub (NP 261XHD) (NARROW HUB) TRS401645CK
701-1 Inner Syncro Ring NP261 NP263 NV27722
701-5 Outer Syncro Ring NP261 NP263 NV26081
701-3 Fiber Friction Syncro Ring NP261 NP263 NV21635
606D Drive Hub / Bushing (Splines into Drive Sprocket) (2 Piece Synchro) TRS401606
606D Drive Hub / Bushing (Splines into Drive Sprocket) (1 Piece Synchro) (updated) rides on M/S inside drive sprocket 4510

Pump, Planet NP261 Transfer Case

PUMPS

Drawing Image Description Part Number
500D Pump Assembly (38 Spline) (NP 261) NV29191
500D Pump Assembly (49 Spline) (NP 261, NP 261XHD) NV25904
463E Tube, Oil Pump (38 Spline Pump) (NP 261) TRS482463
463E Tube, Oil Pump (49 Spline Pump) (NP 261XHD) TRS482463A
Oil Pump Clips Updated NP261 NP263 HD & XHD GM89059653

PLANETS

Drawing Image Description Part Number
588C Planet (6 Pinion) (used w/ .630 inch Wide Input Bearing) (All) TRS351588A

Shafts Input & Main NP261 Transfer Case

Drawing Image Description Part Number
670C Input Shaft (27 Spline) (NP 261) TRS401670
670C Input Shaft (32 Spline) (NP 261) NV42740
670C Input Shaft (29 Spline) (NP 261XHD) NV43996
672D Main Shaft (38 Spline Pump) (NP 261) TRS401672
Main Shaft (NP 261) (NP 263) NV47936
Main Shaft (NP 261) (NP 263) Machined must use NV27721-M NV47936-M
672D Main Shaft (49 Spline Pump) (NP 261XHD) TRS401672A
672D Main Shaft (49 Spline Pump) (NP 261) (NP 263) NV48714
Main Shaft Snap Ring required going from 38 to 49 Spline Pump TRSMWT44716

Cases & Housings NP261 Transfer Case

Drawing Image Description Part Number
760-1A Case Half (Front) (NP 261) NV30959
760-1A Case Half (Front) (Cast # 30601) (NP 261XHD) NV21943
Case Half (Rear) (NP 261XHD NP 263XHD) MG620002
Case Half (Rear) Standard (NP 261 NP263) MWTMG62001

Chains & Sprockets NP261 Transfer Case

Drawing Image Description Part Number
700E Chain (1.25 inch Wide) 49 Links 98 Pins, 3/8 inch Pitch, Rocker Pins CL10-072
700E Chain (1.50 inch Wide) 42 Links . 84 Pins, 7/16 inch Pitch, Round Pins CL10-074
700E Chain (1.50 inch Wide) 49 Links 98 Pins, 3/8 inch Pitch, Rocker Pins CL10-069
805D Drive Sprocket (1.25 inch Chain) (NP 261) TRS401805
805D Drive Sprocket (1.50 inch Chain) (NP 261) TRS401805B
805D Drive Sprocket (1.50 inch Chain) (NP 261XHD) TRS401805A
806E Driven Sprocket (1.25 inch Chain) (NP 261) TRS401805
806E Driven Sprocket (1.50 inch Chain) (NP 261) TRS401805B
806E Driven Sprocket (1.50 inch Chain) (NP 261XHD) TRS401805A

Miscellaneous Components NP261 Transfer Case

Drawing Image Description Part Number
N.I. Case Protector Plate – Anti Wear (Prevents Pump Lug Wear in Case) Machine part not stamped sheet metal MW52007
N.I. Selector Support, Shift Cam (All) TRS401626A
626B Shift Cam (All) TRS401626
862D Snap Ring, Drive Hub (All) TRS401860
861D Snap Ring, Rear Output Shaft Bearing (NP 261) NP4856643
861D Snap Ring, Rear Output Shaft Bearing (NP 261XHD) TRS352860B
860D Snap Ring, Rear Main Shaft Bearing, Outer (All) TRS482860
436A Speed Sensor (All) TRS411436
997D Speedometer Tone Wheel (38 Spline) (NP 261) TRS401997
997D Speedometer Tone Wheel (49 Spline) (NP 261, NP 261XHD) GM12478089
775A Stud, Front Case (NP 261) 260705
411A Switch, 4wd Indicator (3 Prong) (Electrical) (All) TRS351411A
490A Vent Tube (All) 411490

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