Revisions to this document are noted
by a stripe in the left-hand margin

SUBJECT:

SIL 03-WT-24, Rev. A
December 11, 2024
Page 1 of 9

New Governed Speed Uprate Design for 3000 Series

MODELS AFFECTED:

3000 SeriesTM and 4000 SeriesTM

SERIAL NUMBERS AFFECTED:

Refer to Table 3

Introduction:
Allison Transmission is pleased to announce the release of its 3000 Series transmission with capabilities of higher
governed speed revolutions per minute (rpm) input, known as Governed Speed Uprate (GSU). Until now, the
maximum input speed for 3000 Series production has been limited to 2800 rpm. This new design aligns 3000
Series transmission ratings with new engine updates, driven by regulatory changes.
The new 3200 rpm maximum governed speed will apply to all 3000 Series models except xFE models (including
3414 RHS model) and 7-speed models.

Figure 1. Areas of Change for GSU Implementation

JT / SL9158EN

6781537

Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

SIL 03-WT-24, Rev. A
December 11, 2024
Page 2 of 9

NOTE: GSU transmission operation can accept engine output up to 3200 rpm in 1 (First Range) through
4 (Fourth Range) and will be controlled by transmission-to-engine communication by the Transmission
Control Module (TCM). The rpm increase is not needed in 5 (Fifth Range) or 6 (Sixth Range). TCM
software of C261 or later is required for proper GSU operation and will be made available starting in Q2
2025.
The new 3000 Series GSU design required changes to the Channel Plate, Channel Plate Gasket, Channel
Separator Plate, Solenoid Separator Plate, Main Valve Body, Main Regulator Valve and Spring, Springs for the
Converter Flow and Control Main and the Oil Pump, making the Main Valve Body Assembly for the 3000 Series
6-speed unique compared to the 4000 Series 6-speed.
There are now three Main Valve Body designs for current production:
• 3000 Series 6-speed products, GSU
• 4000 Series 6-speed products (also used to service pre-GSU 3000 Series 6-speed products)
• 3000 and 4000 Series 7-speed products

Changes to 3000 Series Hardware:
The following figures show the changes that were made to the 3000 Series 6-speed transmission hardware
to create the new Governed Speed Uprate design.
The Main Valve Body casting tool was changed to remove the slot shown in Figure 2. Some cast features were
removed so that the valve body can be machined to satisfy both standard and GSU designs.

Figure 2. Slot Removed from 3000 Series 6-Speed Main Valve Body

Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

SIL 03-WT-24, Rev. A
December 11, 2024
Page 3 of 9
Figure 3 shows the Channel Plate comparison. Each design is shown with a layered cross-section in order to see
the full extent of the revised passages. The pink passage has been added to the GSU Channel Plate.

Figure 3. Modifications for 3000 Series 6-Speed GSU Channel Plate
Figure 4 shows the Main Regulator Valve comparison. The GSU Main Regulator Valve (P/N 29570338) can be
identified by locating the additional balance groove (five total) and removed material from the valve stem, whereas
the pre-GSU valve contains four balance grooves. Laying these two valves side-by-side you can also see that
the new GSU valve has a slightly longer sealing land.

Figure 4. Modifications to the Main Regulator Valve
Although the last four digits of the Channel Plate Gasket part number ('9709') can positively identify the GSU
design, there is also an additional identification tab that can be seen while the Control Valve Module is assembled.
Refer to Figure 5 for a 6-speed, Channel Plate Gasket comparison and the location of the external tab. The blue
lines identify the GSU gasket changes from the pre-GSU gasket design.

Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

SIL 03-WT-24, Rev. A
December 11, 2024
Page 4 of 9

Figure 5. Comparison of 3000 Series 6-Speed Channel Plate Gaskets
Former Solenoid Separator Plate (P/N 29557350) has been completely canceled. The new GSU Solenoid
Separator Plate (P/N 29569710) contains the same cutout features as the former plate except it includes a
modified hole to close off opening to an exhaust passage and shifted the locating Spring Pin hole location to
serve as an anti-misassembly feature (refer to Figure 6). New GSU Solenoid Separator Plate (P/N 29569710) is
backward compatible and can be used where the former plate (P/N 29557350) was used.

Figure 6. Comparison of 3000 Series 6-Speed Separator Plates
Based on the change in fluid dynamics of the GSU design, the oil pump housing was modified as shown in
Figure 7. Oil pump housing changes include an inlet channel modification, where the feed finger moved radially
inward and the feed cavity changed to stabilize flow. Additionally, optimization of the pump’s metering groove
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

SIL 03-WT-24, Rev. A
December 11, 2024
Page 5 of 9
was changed by moving it radially inward and improving the step profile. All 3000 Series 6-speed products now
contain the new oil pump design.

Figure 7. Comparing the 3000 Series 6-Speed Oil Pumps

New Groups and Parts:
Service strategy required the release of five new 3000 Series 6-speed GSU groups: 10-678, 10-679, 16-1938,
16-1939 and 16-1940. Unique GSU parts with new part numbers were released for the Channel Plates, Main Valve
Body, revised Separator Plates and Gasket and Oil Pumps.
With the production release of the new GSU groups, Allison has revised for service the 3000 Series 6-speed
engineering groups 16-1908, 16-1909 and 16-1911, and revised 3000 Series 7-speed group 16-1910.
For GSU parts that are backward compatible, engineering groups within the Parts Catalog will show part number
supersession for parts that are being discontinued, such as the Main Valve Body Assembly, Main Valve Body,
Solenoid Separator Plate, Main Regulator Valve, three Springs and Oil Pumps. Use the transmission serial number
to reveal all serviceable part numbers and superseded parts in the Parts Catalog.
CAUTION: While the Spring Pin installation locations help prevent mis-assembling the hardware, failure
to use the appropriate GSU parts in 3000 Series 6-speed Governed Speed Uprate applications can lead
to noise complaints and potential premature failure of the transmission.
Compatibility and Interchangeability:
To help prevent installation of parts that are not compatible, anti-misassembly features have been designed into
overlapping designs. Allison has designed features between the revised Channel Plate parts and the Main Valve
Body. Similarly, anti-misassembly features have been included between the Main Valve Body and the Solenoid
Separator Plate. As depicted in Figure 8 and Figure 9, only compatible parts can be assembled without Spring
Pin interference.
The following acronyms are used in (and around) Figure 8, Figure 9, Table 1, Table 2 and Table 3.
3K = 3000 Series 6- and 7-speed drop box
4K = 4000 Series 6- and 7-speed straight
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

SIL 03-WT-24, Rev. A
December 11, 2024
Page 6 of 9
GSU = Governed Speed Uprate
3K6 = 3000 Series 6-speed
4K6 = 4000 Series 6-speed
3K7 = 3000 Series 7-speed drop box
4K7 = 4000 Series 7-speed straight
FLI = Filter Life Indicator
TIDA = Transmission Identification A
TIDB = Transmission Identification B
Figure 8 shows Spring Pin (P/N 11513011) location variation with differing Main Valve Body and Channel Plate
parts (Channel Plate, Channel Plate Gasket and Channel Separator Plate). While there are combinations of
compatible parts that will assemble when the Spring Pin is utilized, there are six combinations of parts that can be
mis-assembled if you do not utilize the Spring Pin.
NOTE: Valve bodies from Parts Distribution Centers do not contain Spring Pins. As such, for
anti-misassembly feature to work, technicians must install Spring Pins prior to assembly process.

Figure 8. Spring Pin Anti-Misassembly Features In Lower Valve Body
Figure 9 shows Spring Pin (P/N 11513011) location variations with different Main Valve Bodies and Solenoid
Separator Plates. There will only be one combination that will have “Interference” (the 4000 Series Solenoid
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

SIL 03-WT-24, Rev. A
December 11, 2024
Page 7 of 9
Separator Plate with the GSU Main Valve Body). It is important to follow the Parts Catalog bill of material, paying
close attention to the Separator Plate part number etched into the plate for proper use.

Figure 9. Spring Pin Anti-Misassembly Features in Upper Valve Body
Service Kits:
Running changes to Field Action kits (6-speed Kit P/N 29567617 and 7-speed Kit P/N 29567618 for Field Action
2019FA07 have been made by removing the former 6-speed Main Valve Body P/N 29563951 or 7-speed Main
Valve Body P/N 29563952, adding the new 6-speed Main Valve Body P/N 29569716 or 7-speed Main Valve Body
P/N 29569783, and replacing the former Main Regulator Valve P/N 29563501 with the new Main Regulator Valve
P/N 29570338. Refer to Table 1 for part changes within these Field Action kits.
Table 1. Field Action Kits Content Changes
Former Part Name
KIT-BODY VALVE, MAIN VALVE BODY
FIELD ACTION, 6-SPEED

Former P/N

eBOM
Qty

29567617

Current Part Name

Current P/N

KIT, MAIN VALVE BODY FIELD
ACTION, 6-SPEED

29567617

VALVE-REGULATOR MAIN

29563501

1

VALVE REGULATOR MAIN

29570338

BODY-VALVE, MAIN, 6-SPEED

29563951

1

BODY VALVE MAIN, 6-SPEED
4K6 & 3K6 PRE-GSU

29569716

Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

SIL 03-WT-24, Rev. A
December 11, 2024
Page 8 of 9

Table 1. Field Action Kits Content Changes (cont'd)
Former Part Name

Former P/N

KIT-BODY VALVE, MAIN VALVE BODY
FIELD ACTION, 7-SPEED

eBOM
Qty

Current Part Name
KIT, MAIN VALVE BODY FIELD
ACTION, 7-SPEED

29567618

Current P/N
29567618

BODY VALVE MAIN, 7-SPEED

29563952

1

BODY-VALVE, MAIN, 7-SPEED

29569783

VALVE REGULATOR MAIN

29563501

1

VALVE REGULATOR MAIN

29570338

Since the new parts being introduced to these Field Action kits are backward compatible, the existing kit part
numbers remain the same. Once kits with former hardware are exhausted from the Parts Distribution Center
(PDC), kits will be assembled using the new part design. Field Action letters will be updated with the new bill of
material part numbers when PDC assembles the new kit content.
Additionally, Control Module Seal and Gasket Kit (P/N 29559768) for 3000 Series 6-speed with Prognostics and
FLI (TIDA or TIDB) will undergo a bill of material revision to include the new Channel Plate Gasket (P/N 29569709).
Since the new Channel Plate Gasket (P/N 29569709) is not backward compatible, it is augmenting this seal and
gasket kit. Likewise, since the former Channel Plate Gasket (P/N 29557345) is not forward compatible, it will
remain serviceable as a detail part and remain in the kit. Kit users will need to determine which gasket to use for
the application being repaired (refer to Instruction Sheet 360). Refer to the Parts Catalog to see revised kit content.
Former part numbers that have a new part number replacement (where the new part is backward compatible)
have been completely cancelled and will not be available for service after stock is depleted. Refer to Table 2
for part number supersession.
New GSU parts that are identified as "backward compatible" in Table 2 can be intermixed with former, pre-GSU
parts provided that GSU is not utilized in the vehicle. Otherwise, GSU-specific parts must be used together for
GSU applications.
NOTE: Allison is maintaining for service any former parts that do not have a backward compatible, direct
replacement, including the former 3000 Series medium Channel Plate P/N 29558683, former 3000 Series
shallow Channel Plate P/N 29558685, former Separator Plate P/N 29557334 and former Channel Plate
Gasket P/N 29557345. All GSU parts (P/N 29569716, P/N 29569783, P/N 29569710, P/N 29570810,
P/N 29570338, P/N 29569805, and P/N 29569806) that are backward compatible, their preceding part
numbers have been completely cancelled.

Table 2. Part Number Supersession and Compatibility
Current P/N
Backward
Compatible?

Former Service
P/N

Current Service
P/N

Solenoid Separator Plate,
3K6 3K7

29557350

29569710^

Solenoid Separator Plate, 3K6
GSU, 3K7

Yes

Solenoid Separator Plate,
4K6 4K7

29557351

29570810^

Solenoid Separator Plate, 4K6 4K7

Yes

N/A

29569706^

Main Valve Body, 3K6 GSU

N/A

Former Description

N/A

Current Description

Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

SIL 03-WT-24, Rev. A
December 11, 2024
Page 9 of 9

Table 2. Part Number Supersession and Compatibility (cont'd)
Current P/N
Backward
Compatible?

Former Service
P/N

Current Service
P/N

Main Valve Body, 6 Speed,
3K6 4K6

29563951

29569716^

Main Valve Body, 6 Speed, 4K6 &
3K6 pre-GSU

Yes

Main Valve Body, 7 Speed,
3K7 4K7

29563952

29569783^

Main Valve Body, 7 Speed, 3K7
4K7

Yes

Valve, Main Regulator

29563501

29570338^

Valve, Main Regulator, GSU

Yes

Spring, Control Main

29557291

29569805^

Spring, Control Main, GSU

Yes

29557291

29569805^

Spring, Converter Flow, GSU

Yes

Spring, Main Regulator

29557292

29569806^

Spring, Main Regulator, GSU

Yes

Separator Plate, Channel,
3K6

29557334^

29569708^

Separator Plate, Channel, 3K6
GSU

No

Gasket, Channel Plate, 3K6

29557345^

29569709^

Gasket, Channel Plate, 3K6 GSU

No

Channel Plate, Medium 3K6

29558683^

29569703^

Channel Plate, Medium 3K6 GSU

No

Channel Plate, Shallow 3K6

29558685^

29569713^

Channel Plate, Shallow 3K6 GSU

No

Front Support (non-PTO)

29515911

29570762

Front Support (non-PTO), GSU

Yes

Pump Housing Assembly
(non-PTO)

29553196

29570747^

Pump Housing Assembly
(non-PTO), GSU

Yes

Pump Housing (non-PTO)

29553197

29569451

Pump Housing (non-PTO), GSU

Yes

Front Support (PTO)

29516008

29570763

Front Support (PTO), GSU

Yes

Pump Housing (PTO)

29553198

29569452^

Pump Housing (PTO), GSU

Yes

Former Description

Spring, Converter Flow

Current Description

^ P/N will be maintained for service

Table 3. Serial Numbers Affected by Plant SOP Phase-in
Oil Pump

Customer

Beginning with S/N

Control Module

With PTO
Drive Gear

Without PTO
Drive Gear

6512022321

GSU

GSU

GSU

6520285884
6520285940
6520287754
6520288151

pre-GSU
GSU

pre-GSU
GSU
GSU

Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

All OEMs
All OEMs
(except Daimler)
All OEMs
(including Daimler)