NP136 Chevy Astro and Oldsmobile Bravada Transfer Case Buy Factory Direct & Save, we Ship World Wide!

See the complete line of products that we can provide at www.midwesttrans.com. To speak to a Drive Train Expert or to place and order call toll free 888-824-2012, buy factory direct and save money!

Having issues diagnosing problems with your NP136 transfer case? We can help free knowledgeable technical support! We have a large inventory of rebuilt NP136 transfer cases plus Transfer Case parts. Our factory rebuilt re-manufactured

nv136 gm transfer case
Free Technical Support, Get Expert advice about your Astro, Safari or Bravada's transfer case. Call toll free at 888-824-2012. Save Money no hassle 12 month warranty!

Transfer Cases are tested before leaving the factory. This transfer case was manufactured by New Venture Gear. This model is chain driven. The NP136 is AWD with electric clutch pack. The NP136 was used in Chevrolet Astro, GMC Safari vans and Oldsmobile Bravada Vans. This unit was utilized begining in 1998.

The NP136 was manufactured with electrical shift encoder motors, this unit has two different drive ranges 2 high and 4WD (run at reduced speeds) with the front output drop on the driverside. This unit has a 27 spline front output and utilizes a rear slip yoke.

If you have purchased your van 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 NP136 transfer case to fail.

automatic transmission rebuilt

This unit has a couple of problems, it utilizes a viscous coupler clutch system that can fail. One way to recognize this failure mode is clicking sounds when turning on dry asphalt or concrete surfaces. Viscous coupler failure is attributed to excessive heat build up. The second problem is that the oil circulation pump on NP136 can wear a hole in the case, see illustration, we provide a transfer case saver to prevent this from happening. Once you have a hole in the case fluid will be lost and the case will fail. Don't leave home without our case saver, it's only a matter of time. Recommended fluid for the NP 136 transfer case is GM part number 12378396.

We can provide a rebuilt NP136 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!

Select this link to see what models that use this Transfer Case.

Free NP136 Transfer Case parts illustration

Below we provide a NP136 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.

Below you will find a detailed list that includes complete rebuilt Transfer Cases, bearing rebuild kits, gaskets, seal & thrust washers, bushings individual bearing, forks and sliders, oil pump, planets, chain, sprockets 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.

Applications Model Years  

np136 id tag sample

This information tag is located on rear of transfer case near where the driveshaft exits.

Astro & Safari Van 1999-UP
Bravada 1998-Up

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 Tested NP136 Transfer Cases 12 Month Warranty

IMG # DESCRIPTION IPart Number
YOUR COST
REBUILT TRANSFER CASES
Transfer Case Chevrolet GM 1998 UP MWTTCGM032
$666.67
Core deposit on above Transfer Case
$250.00

 

Rebuilt Overhaul Bearing Kits NP136 Transfer Case

IMG # DESCRIPTION IPart Number
YOUR COST
BEARING KITS
N.I. NP136 1998 UP MWT-333
$205.31
Case Protector Plate - Anti Wear (Prevents Pump Lug Wear in Case) MWT52007
$65.00

 

Gaskets Seals, & Filter NP136 Transfer Case

IMG # DESCRIPTION IPart Number
YOUR COST
GASKET & SEAL KITS
N.I. NP136 MWTTSK136
$29.93
FILTERS
012D Pump Screen (Filter) TRS351012
$4.94
SEALS
070A Input Seal TRS411070
$3.93
081A Front Output Seal TRS411081
$9.45
074A Rear Output Seal TRS411074
$4.94

 

Bushings & TH Washers NP136 Transfer Case

IMG # DESCRIPTION IPart Number
YOUR COST
BUSHINGS
066A Extension Housing (2.010” OD). TRS331066
$3.93
WASHERS
N.I. Planet Thrust Washer (Plastic) TRS411215
$1.91

 

Bearings NP136 Transfer Case

IMG # DESCRIPTION IPart Number
YOUR COST
BEARINGS
N.I. Shift Shaft Bearing TRS411279
$4.94
250B Clutch Drum Bearing TRS411250
$8.98
240C Input Bearing (Inner) (38mm OD) TRS411240
$6.96
268C Input Bearing (.630” Wide) TRS325287
$12.92
264D Front Output Shaft Bearing (Front) TRS331268
$8.98
N.I. Front Output Shaft Bearing (Rear) TRS331268B
$12.92
266B Main Shaft Bearing (Front) TRS411210
$43.93
269C Main Shaft Bearing (Rear) TRS404220A
$28.98

 

Shift Forks & Sliders NP136 Transfer Case

IMG # DESCRIPTION IPart Number
YOUR COST
SLIDERS
645B Range Slider & Hub TRS492645K
$53.93
FORKS
850A Fork (Clutch Pack Apply) TRS411850
$118.98
N.I. Fork Insert (29mm Long) TRS411850-1A
$0.91
N.I. Fork Insert (52mm Long) TRS411850-1
$0.91

 

Pump, Planet & Chain NP136 Transfer Case

IMG # DESCRIPTION IPart Number
YOUR COST
PUMPS
500C Pump Assembly TRS371500
$42.92
PLANETS
N.I. Planet (6 Pinion) TRS351588A
$178.98
CHAINS
700D Chain (1.00 inch Wide) 49 Links TRSHV-062
$104.94
Chain (1.00 inch Wide) MWTCL-071
$90.90

 

Miscellaneous Components NP136 Transfer Case 

IMG # DESCRIPTION IPart Number
YOUR COST
MISCELLANEOUS COMPONENTS
N.I. Case Protector Clip - Anti Wear (Prevents Pump Lug Wear in Case) TRS411460
$4.94
N.I. Case Protector Plate - Anti Wear (Prevents Pump Lug Wear in Case) TRS482460
$43.93
118B Friction Plate TRS428118A
$3.93
138B Steel Plate TRS12120
$1.91
420A Shift Motor OE12474041 MWTUMM1235
$225.95
860C Snap Ring, Rear Main Shaft (Outer) TRS411860
$8.58
412A Speed Sensor TRS411436
$29.99
490A Vent Tube (Plastic) TRS411490
$3.93
UMM1235 astro 1999-2005
Click Images to enlarge and shrink

np136 parts illustration

np136 hole in case

Damaged transfer case housing, at the first sign of fluid on the garage floor be sure to fix this problem.

np136 transfer case shift motor

Encoder Shift motor

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