NHTSA ID Number: 10130628
Manufacturer Communication Number: 12-04-21-001B
TSB/Document Date: 2018-04-02
Summary
This technical bulletin provides a revision of 12-04-21-001A to add the 2013 model year, clarify the information from the previous bulletin and to add data throughout. The document should be reviewed and treated as new information.
High/Low Planetary Carrier
Retaining Ring
15547397
NQG/NQH
5
High/Low Locking Plate- three
tab design
19300745
NQG/NQH
6
Thrust Washer-Front - No tab
design
12470959
NQG/NQH
7
Input Shaft Assembly- w/pilot
bearing
19299085
NQG/NQH-w/M30
7
Input Shaft Assembly - w/pilot
bearing
19299088
NQH-w/M99
NQG/NQH-w/MYC
7
Input Shaft Assembly-w/pilot
bearing
19255997
NP0-w/MYC
8
Pilot Bearing
19132983
NQG/NQH/NP0
9
Thrust Washer-Rear- Three tab
design
19300746
NQG/NQH
10
High/Low Planetary Carrier
Assembly- Three pinion design
19299090
NQG/NQH
11
High/Low Clutch
19299092
NQG/NQH - w/M30
11
High/Low Clutch
19299093
NQG/NQH w/MYC and NQH
w/M99
8
Note: 2007-2010 MY Heavy Duty NQF transfer case assemblies were only produced with first-design content. Service 2007-2010 MY Heavy Duty NQG
transfer case service assemblies may contain either first or second design content.
Magna Heavy Duty NQF/NQG/NQH – First Design
Callout
Description
GM PN
Service Usage
1
Front Case Half Assembly
19257420
2011-13 NQF
19133000
2007-10 NQG
19259038
2011-13 NQG
19132998
2007-13 NQH
w/gear (2) and ring (3)
1
Front Case Half Assembly
w/gear (2) and ring (3)
1
Front Case Half Assembly
w/gear (2) and ring (3)
1
Front Case Half Assembly
w/gear (2) and ring (3)
2
High/Low Internal Gear-Not
serviceable-part of case
assembly
NO/PN
NQF/NQG/NQH
3
High/Low Internal Gear
Retaining Ring
19133009
NQF/NQG/NQH
4
High/Low Planetary Carrier
Retaining Ring
19132997
NQF/NQG/NQH
9
5
High/Low Locking Plate-Single
tab design
19132996
NQF/NQG/NQH
6
Thrust Washer-No tab design Front
19132995
NQF/NQGF/NQH
7
Input Shaft Assembly w/pilot
bearing
19132979
NQH w/MYD
07-10MY NQF/NQG w/MYD
and MW7
7
Input Shaft Assembly-w/pilot
bearing
19257419
2007-13 NQF/NQG w/MYD
7
Input Shaft Assembly-w/pilot
bearing
19259039
2011-13 NQF/NQG w/MW7
8
Pilot Bearing
19259040
2011-13MY NQF/NQG w/MW7
8
Pilot Bearing
19132984
2007-10MY NQF/NQG/NQH w/ MW7 / MYD
2007-13 NQH w/MYD
2011-13 NQF/NQG w/ MYD
9
Thrust Washer-No tab designRear
19132995
NQG/NQH
2011-13 NQF
10
High/Low Planetary Carrier
Assembly-Five pinion design
19132987
NQG/NQH
2011-13 NQF
11
High/Low Clutch
19260067
NQG/NQH
2011-13 NQF
10
Magna Heavy Duty NQF/NQG/NQH – Second Design
Callout
Description
GM PN
Service Usage
1
Front Case Half Assembly
19299079
2011-13 NQF
19299078
2007-10 NQG
19299080
2011-13 NQG
19299077
2007-13 NQH
w/gear (2) and ring (3)
1
Front Case Half Assembly
w/gear (2) and ring (3)
1
Front Case Half Assembly
w/gear (2) and ring (3)
1
Front Case Half Assembly
w/gear (2) and ring (3)
2
High/Low Internal Gear-Not
serviceable-part of case
assembly
NO/PN
NQF/NQG/NQH
3
High/Low Internal Gear
Retaining Ring
14037953
NQF/NQG/NQH
4
High/Low Planetary Carrier
Retaining Ring
15547397
NQF/NQG/NQH
5
High/Low Locking Plate-Two tab
design
15664905
NQF/NQG/NQH
11
6
Thrust Washer-No tab design Front
12470959
NQF/NQGF/NQH
7
Input Shaft Assembly-w/pilot
bearing
19299086
NQH w/MYD
07-10MY NQG w/MYD and
MW7
7
Input Shaft Assembly-w/pilot
bearing
19299087
2011-13 NQF/NQG w/MYD
7
Input Shaft Assembly-w/pilot
bearing
19299089
2011-13 NQF/NQG w/MW7
8
Pilot Bearing
19259040
2011-13MY NQF/NQG w/MW7
8
Pilot Bearing
19132984
2007-10MY NQF/NQG/NQH w/ MW7 / MYD
2007-13 NQH w/MYD
2011-13 NQF/NQG w/ MYD
9
Thrust Washer-Two tab designRear
15547390
NQG/NQH
2011-13 NQF
10
High/Low Planetary Carrier
Assembly-Six pinion design
19299091
NQG/NQH
2011-13 NQF
11
High/Low Clutch
19299093
NQG/NQH
2011-13 NQF
Front Case Half Identification
12
The first design front case half assembly can be identified as having an internal gear that is a 94 tooth design with an inside diameter (a) of 148.5 mm (5.85 in).
The second design front case half assembly can be identified as having an internal gear that is a 91 tooth design with an inside diameter (a) of
142 mm (5.59 in).
Input Shaft Identification
13
The first design input shaft can be identified as a 56 tooth design with an outside diameter (a) of 91.4 mm (3.60 in).
The second design input shaft can be identified as a 53 tooth design with an outside diameter (a) of 87.50 mm (3.44 in).
High/Low Planetary Carrier Assembly Identification
The first-design light-duty 3-pinion high/low planetary carrier (1) can be identified as having a 30 tooth design with an inside diameter (a) of 61.3 mm (2.41 in). In
addition, the first-design carrier can also be identified by the presence of a recessed washer pocket (3) at the rear thrust washer location.
The second-design light-duty 3-pinion high/low planetary carrier (2) can be identified as having a 29 tooth design with an inside diameter (b) of
60.2 mm (2.37 in). In addition, the second-design carrier can also be identified by the lack of a recessed washer pocket (4) at the rear thrust washer location.
14
The first-design heavy-duty 5-pinion high/low planetary carrier (1) can be identified as having 5 pinions and a 30 tooth design with an inside diameter (a) of 61.3
mm (2.41 in).
The second-design heavy-duty 6-pinion high/low planetary carrier (2) can be identified as having 6 pinions and a 29 tooth design with an inside diameter (b) of
60.2 mm (2.37 in).
High/Low Clutch
15
The first design high/low clutch can be identified as having a 30 tooth design with a gear tooth outside diameter (a) of 65.50 mm (2.58 in).
The second design high/low clutch can be identified as having a 29 tooth design with a gear tooth outside diameter (a) of 63.25 mm (2.49 in).
Component Replacement – Conversion from First Design to Second Design
16
It is possible to repair a first-design assembly using second-design components. Refer to the parts catalog and the tables above for component part number
clarification.
Note: First-design LD components are shown in the view above.
When servicing a first-design assembly with second-design components, the following components MUST be replaced as a group:
1.
Front Case Half Assembly – with internal gear and retaining ring
2.
Locking Plate
3.
Thrust Washer (front)
4.
Input Shaft
5.
Pilot Bearing
6.
Thrust Washer (rear)
7.
Planetary Carrier Assembly
8.
High/Low Clutch
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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TSB/Document ID: 12-04-21-001B
Replacement Service Bulletin Number:
MFR Communication Date: 2013-04-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
MFR Component System:
MFR Component Subsystem:
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