NHTSA ID Number: 10235173
Manufacturer Communication Number: SIL-10-1k2k-22
TSB/Document Date: 2023-05-01
Summary
Information for launch of 9-speed transmission
SIL 10-1K2K-22
March 23, 2023
Page 1 of 23
SUBJECT:
Allison 9-Speed Transmission Launch Information
MODELS AFFECTED:
2900 Series
SERIAL NUMBERS AFFECTED:
Indianapolis, Plant 4 – 6410001000 and after
Introduction
Allison Transmission is pleased to announce the February 2023 launch of the Allison 9-Speed transmission
(Figure 1). This medium-duty, fully-automatic transmission offers nine forward ranges (consisting of three overdrive
ranges) for improved drivability and increased gear ratio coverage over a transmission with fewer ranges. Refer to
Table 1 for gear ratio comparisons of traditional 6-speed and new 9-speed designs.
The new 9-Speed transmission performs in vehicle applications up to 1220 N·m (900 lb-ft), 283 kW (380 hp), and
25,855 kg (57,000 lbs) GVWR/GCWR without park pawl (or 14,969 kg (33,000 lbs) GVWR/GCWR with park pawl).
Figure 1. 9-Speed Automatic Transmission
Allison’s 9-Speed incorporates an additional planetary gear set and stationary clutch over traditional Allison 1000
SeriesTM and 2000 SeriesTM 6-speed products to achieve nine forward ranges. Figure 2 shows the locations of the
JT / SL8984EN
6408136
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 2 of 23
new P4 planetary and C6 clutch, and how other planetaries/clutches retain their original naming convention and
front-to-back sequence.
Table 1. Comparison Between 9-speed and 6-speed Gear Ratios
1000 Series and 2000 Series 6-speed
9-Speed
Gear Ratio
Close Ratio
Wide Ratio
Close Ratio
Wide Ratio
1st
3.10
3.51
4.20
4.82
2nd
1.81
1.90
3.10
3.51
3rd
1.41
1.44
2.61
2.85
4th
1.00
1.00
1.81
1.90
5th
0.71
0.74
1.41
1.44
6th
0.61
0.64
1.00
1.00
7th
—
—
0.71
0.74
8th
—
—
0.61
0.64
9th
—
—
0.54
0.57
Reverse
-4.49
-5.09
-4.49
-5.09
Ratio Coverage
5.05
5.46
7.78
8.46
Figure 2. 9-Speed Clutch and Planetary Positions and Sequence
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 3 of 23
Model Designations
The 2900 Series model nomenclature is a “smart” number that can help define maximum input torque capacity,
close or wide ratio gearing and park pawl configuration.
Approved vocational models include the Highway SeriesTM (HS), Motorhome SeriesTM (MH), Pupil Transport/Shuttle
SeriesTM (PTS), Rugged Duty SeriesTM (RDS), Specialty SeriesTM (SP), Torqmatic® Series and International
.
Vocational model numbers include a prefix or suffix to designate the vocation intended. Figure 3 shows variations
of the 2900 Series vocational model numbers.
NOTE: Additional vocational models can be considered for release and will be managed through the
9-speed opportunity pipeline. Contact your Allison sales representative to explore models, ratings or
growth opportunities.
Figure 3. 9-Speed 2900 Series Vocational Model Nomenclature
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 4 of 23
Component Identification
Each 9-Speed transmission will be identified with a production serial number. The 7-digit serial number will be
preceded with a 3-digit prefix code to denote the product and manufacturing location. Refer to Figure 4 for serial
number breakdown definition.
Figure 4. 9-Speed Unit Serial Number Breakdown Definition
COMPONENT OVERVIEW
Main Case Housing
The 9-Speed transmission main case housing is 110 mm (4.33 in) longer to allow for the addition of the new P4
planetary and C6 clutch (refer to Figure 5).
Parts that assemble to create the longer housing have been released in new engineering groups 01-912 and
01-913, shift-by-wire and shift-by-cable, respectively. Details can be found in Parts Catalog PC8895 under these
group numbers.
Figure 5. Main Case Housing Comparison
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 5 of 23
Torque Converter Options
Listed in Table 2 are MY2022 torque converters that were released for the coordinated front end changes.
Coordinated front end changes that occurred to the 1000 Series and 2000 Series 6-speed are described in SIL
21-1K2K-21 and describe compatibility with the new front support and turbine shaft design.
Torque converter assemblies for the 9-Speed product have been released in new engineering group numbers
shown in Table 2. Refer to the 9-Speed Parts Catalog (PC8895) for any updates to serviceable torque converter
part numbers.
There are no OEM interface changes to the MY2022 torque converters.
Table 2. MY2022 Torque Converter for 9-Speed Transmissions
Engineering
Group
Description
P/N
21-975
TC 210 Torque Converter, 9-speed, Stall Torque Ratio 2.06:1.00
29564108
21-976
TC 211, Torque Converter, 9-speed, Stall Torque Ratio 2.01:1.00
29564107
21-977
TC 221, Torque Converter, 9-speed, Stall Torque Ratio 1.75:1.00
29564109
21-978
TC 222, Torque Converter, 9-speed, Stall Torque Ratio 1.63:1.00
29564110
21-979
TC 222H, High Rate Damper Converter, 9-speed, Stall Torque Ratio 1.63:1.00
29565110
21-980
TC 211D, Low Rate Damper Converter, 9-speed, Stall Torque Ratio 2.01:1.00
29564111
21-981
TC 221D, Low Rate Damper Converter, 9-speed, Stall Torque Ratio 1:75:1.00
29564112
21-982
TC 222D, Low Rate Damper Converter, 9-speed, Stall Torque Ratio 1.63:1.00
29564113
Figure 6. External View of Torque Converter (Pump Side)
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 6 of 23
Front Support & Oil Pump
The front support assembly is common with the coordinated front end changes that were made to the 1000 Series
and 2000 Series 6-speed products in January 2022. Specifically, the MY2022 redesign uses a shorter ground
sleeve. See SIL 21-1K2K-21 for additional details.
The new 9-Speed front support assembly does not contain the C1 backfill valve, as it was eliminated prior
to MY2022 design release. Additionally, the ground sleeve has been shortened for movement of the lockup
pressure sealing surface.
Parts that comprise the new front support and oil pump assembly for the 9-Speed product have been released in
new engineering group 10-675 which is listed in Parts Catalog PC8895. Figure 7 compares the new 9-speed front
support to the pre-MY2022 6-speed design.
Figure 7. Front Support Assembly Comparison
Rotating Clutch & PTO Options
The rotating clutch assembly is common with the coordinated front end changes that were made to the 1000 Series
and 2000 Series, 6-speed in January 2022 (reference SIL 21-1K2K-21). Specifically, the MY2022 redesign uses a
new lockup clutch sealing surface between the turbine shaft and torque converter.
Parts that assemble the new 9-Speed rotating clutch assemblies have been released in new engineering groups:
14-1141 that includes the PTO drive gear, and 14-1142 that contains a tone wheel instead of the PTO drive gear.
Both configurations can be reviewed in Parts Catalog PC8895.
Figure 8 compares the new rotating clutch assembly to the pre-MY2022 6-speed design and shows the difference
in turbine shafts.
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 7 of 23
Figure 8. Rotating Clutch and Turbine Shaft Assembly Comparison
Torque Converter Housings
No design changes have been made to the standard SAE #2 and SAE #3 transmission converter housings.
Figure 9 shows the available converter housing options for the 9-Speed transmission. The SAE #2 and SAE #3
converter housing designs are unchanged; however, when associated with the 9-speed they are included within
new engineering groups 34-617 and 34-618, respectively.
No OEM interface changes have been made to these traditional SAE #2 and SAE #3 converter housings. Refer to
Allison 2900 Series Tech Data located on the Allison HUBTM for installation specifications.
NOTE: A direct mount converter housing for the GM 6.6L engine is available for the 1000 Series and
2000 Series 6-speed (not shown). This direct mount is not available with the 9-speed at this time. Please
contact Allison Sales group with opportunities to use the direct mount converter housing for the 9-speed.
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 8 of 23
Figure 9. 9-Speed Converter Housing Options
Control Valve Body Options
Control valve body designs include seven new Pressure Control Solenoids (PCS) (four blue normally high variable
force solenoids and three green normally low variable force solenoids, along with two white shift solenoids). Refer
to the 9-Speed Principles of Operation publication (PO8891) for explanation of variable force solenoids function.
Four PCS solenoids with blue connectors are used to control Modulated Main, C2/C5, C3 and C1 clutches,
whereas the three PCS solenoids with green connectors are used to control C4, C6 and the Torque Converter
Clutch (TCC). Internal wire harness branches are oriented for ease of assembly and contain coordinated color
connectors. Refer to Figure 10 for connector callouts.
NOTE: The 9-Speed design contains a new 29-Way transmission connector. Refer to Figure 10, Figure 11,
Allison Tech Data and Troubleshooting Manual (TS8887) for pin details.
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 9 of 23
Figure 10. Internal Wire Harness with TRS Breakout and Solenoid Connector Colors
Figure 11 compares the new 9-speed control valve body assembly to that of the traditional 6-speed control valve
body assembly. The new 9-speed design incorporates the use of solenoid brackets and retention hardware to
retain a bank of solenoids in each valve body.
NOTE: It may be difficult to disconnect and remove C1 solenoid without removing the control valve
body assembly.
Rubberized separator plate gasket (P/N 29570911) is not reusable. Inspect valve body surfaces for residual
gasket material before reassembly.
Components that assemble to create the new control valve body assembly for the 9-Speed product have been
released in new engineering groups; 16-1929 for shift-by-wire and 16-1930 for shift-by-cable configurations.
Reference Parts Catalog PC8895 for a complete list of service parts.
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 10 of 23
Figure 11. Control Valve Body Assembly Comparison
Oil Pan
The oil pan length is 110 mm (4.33 in) longer to accommodate the added length of the main case. The 9-Speed oil
pan is sealed to the transmission main case with a reusable rubberized pan gasket (P/N 29564555).
Parts that comprise the new oil pan for the 9-Speed have been released in new engineering group 37-602 in Parts
Catalog PC8895. Figure 12 compares the 9-speed to 6-speed oil pan designs.
Figure 12. Shallow Oil Pan Comparison
Rear Cover & Park Pawl Options
There are no OEM interface changes to the rear cover options.
Parts that comprise the new rear cover groups for the 9-Speed have been released in engineering groups 39-1077
through 39-1088, all of which can be located in Parts Catalog PC8895. Refer to Table 3 for a listing of new
9-Speed rear cover groups and Figure 13 for illustrations.
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 11 of 23
Table 3. Listing of 9-Speed Rear Cover and Brake Options
Group Number
Group Description
39-1077
Close Ratio, With Park Pawl, With 9x3 Park Brake Provision, Without Tachograph
39-1078
Close Ratio, Without Park Pawl, With 9x3 Park Brake Provision, Without Tachograph
39-1079
Wide Ratio, With Park Pawl, With 9x3 Park Brake Provision, Without Tachograph
39-1080
Wide Ratio, Without Park Pawl, With 9x3 Park Brake Provision, Without Tachograph
39-1081
Close Ratio, With Park Pawl, With 10x3 Park Brake Provision, With Tachograph
39-1082
Close Ratio, Without Park Pawl, With 10x3 Park Brake Provision, With Tachograph
39-1083
Wide Ratio, With Park Pawl, With 10x3 Park Brake Provision, With Tachograph
39-1084
Wide Ratio, Without Park Pawl, With 10x3 Park Brake Provision, With Tachograph
39-1085
Close Ratio, With Park Pawl and Transfer Case, With Tachograph Provision
39-1086
Close Ratio, Without Park Pawl, With Transfer Case, With Tachograph Provision
39-1087
Wide Ratio, With Park Pawl and Transfer Case, With Tachograph Provision
39-1088
Wide Ratio, Without Park Pawl, With Transfer Case, With Tachograph Provision
Figure 13. Rear Cover Options for 9-Speed Transmission
Shift Selector & Shifting
The 9-speed transmission features skip shifting capability. This transmission feature commands the transmission to
skip certain ranges during a shift to attain the most efficient range during acceleration or deceleration.
The 1-3 and 2-4 upshifts are the only skip upshifts that are currently enabled. These can be scheduled based on
DynActive® evaluation to prevent the engine’s interaction with the governor during quick accelerations or for fuel
economy purposes based on the active DynActive flat ground economy bias.
The only double skip shift allowable at this time is the 9-6 full-throttle downshift. All skip downshifts are possible,
e.g. 9-7, 8-6, etc. During closed throttle shifts, these are evaluated when the deceleration rate is high. Skip
full-throttle downshifts are evaluated and scheduled based on the desired performance, the active DynActive
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 12 of 23
Economy bias and acceleration among other inputs. The selected DynActive Economy bias will impact how skip
shifts are scheduled based on vehicle performance and driver input.
Allison 9-Speed transmissions offer three shift selector control options: shift-by-wire, shift-by-cable and
park-by-cable. Allison 6th Generation Controls push button selectors (PBSS) are used when integrating
shift-by-wire configurations. Shift-by-wire configurations do not include a selector shaft in the transmission.
Shift-by-cable and park-by-cable configurations include a selector shaft (similar to Allison 1000 Series and 2000
Series transmissions) and a Hall-effect Transmission Range Sensor (TRS) to signal selector shaft position to the
transmission TCM. The TRS replaces the Internal Mode Switch (IMS) used in Allison 1000 Series and 2000 Series
transmissions and is not included with transmissions configured for shift-by-wire.
SPECIAL SERVICE INSTRUCTIONS
Transmission Range Sensor
The Transmission Range Sensor (TRS) is an internal Hall effect device integrated with the shift selector shaft and
detent lever system that is used to confirm the selected range. The TRS takes the place of the traditional Internal
Mode Switch (IMS) and will be included in the park-by-cable and shift-by-cable valve body configurations.
Proper installation of the TRS is critical. Extra attention is required to install the detent spring pin between the ears
of the TRS interface. Refer to the red arrows in Figure 14 and Instruction Sheet 375 for proper installation.
WARNING: Failure to properly install the Transmission Range Sensor can lead to unintended vehicle
movement. Be sure to follow Service Manual (SM8889) for complete installation instructions.
The TRS is mounted to the transmission by retention hardware that is not reusable after initial use since the
hardware threads contain a locking compound. Use TRS service kit P/N 29570435 which contains new, one-time
use retention hardware and installation instructions when replacing the TRS. Additional TRS retention hardware is
also available from the Parts Distribution Center (PDC).
Figure 14. Transmission Range Sensor (TRS) Installation
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 13 of 23
NOTE: TRS installation has a different wiring schematic with two additional wires as compared to the
9-speed without TRS and 6-speed designs. Refer to Troubleshooting Manual (TS8887) to view 9-Speed
with TRS wiring schematic for additional details.
C3 Clutch Retaining Ring
Retaining ring orientation for C3 clutch is important during installation. The retaining ring gap needs to be installed
at the 12 o'clock orientation (viewed from the front of the transmission). Refer to Figure 15. Be sure to follow
Service Manual (SM8889) instructions for proper retaining ring orientation.
Figure 15. C3 Clutch Retaining Ring Orientation
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 14 of 23
C4 and C5 Clutch Retaining Rings
There are two nested retaining rings for C4 and C5 clutch packs and these retaining ring orientations are critical
during installation. The C4 clutch retaining ring gap needs to be installed at the 3 o'clock orientation, and C5
clutch retaining ring gap needs to be installed at the 9 o'clock orientation (both installation orientations viewed
from the rear of the transmission). Refer to Figure 16. Be sure to follow Service Manual (SM8889) instructions for
proper retaining ring orientation.
Figure 16. C4 and C5 Clutch Retaining Ring Orientations
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 15 of 23
C6 Clutch Retaining Ring
Retaining ring orientation for C6 clutch is important during installation. Retaining ring gap needs to be installed at
the 3 o'clock orientation (viewed from the front of the transmission). Refer to Figure 17. Be sure to follow Service
Manual (SM8889) instructions for proper retaining ring orientation.
Figure 17. C6 Clutch Retaining Ring Orientation
Technical Publications
The uniqueness of the 9-Speed design requires the need for separate publications from the 1000 Series and
2000 Series 6-speed products. Listed below are the 9-Speed publication numbers that can be referenced when
requesting support materials.
• 9-Speed Operator’s Manual – OM8888EN
• 9-Speed Parts Catalog – PC8895EN
• 9-Speed Service Manual – SM8889EN
• 9-Speed Troubleshooting Manual – TS8887EN
• 9-Speed Mechanic’s Tips – MT8890EN
• 9-Speed Principles of Operation – PO8891EN
Automatic Transmission Fluid (ATF)
Approved ATF includes TES 668® and TES 295® (while supplies last in channel). Allison will perform final test with
TES 668 fluid. Transmissions will ship from Allison to Original Equipment Manufacturers (OEMs) with residual
TES 668 fluid and it will be up to OEMs to select their transmission fluid for transmission filling and top-off. Allison
Extended Transmission Coverage (ETC) requires the use of Allison Approved fluids per the ETC agreement.
Follow Service Information Letter SIL 10-TR-99 (latest revision) for recommended transmission fluid and filter
change intervals. Table 4 provides an excerpt of information from the SIL.
Copyright © 2023 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22
March 23, 2023
Page 16 of 23
Table 4. Recommended Filter Change/Fluid Intervals
9-Speed Fluid And Filter Change Interval Recommendations
Prognostics Turned Off or Not
Calibrated in TCM
Prognostics Turned On
Duty Cycle
Allison Approved TES 668®
and/or TES 295® Fluid
Allison Approved TES 668®
and/or TES 295® Fluid
General*
150,000 Miles (240,000 km)
4,000 Hours
48 Months
Severe**
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TSB/Document ID: SIL-10-1k2k-22
Replacement Service Bulletin Number:
MFR Communication Date: 2023-03-23
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
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