NHTSA ID Number: 11011661
Manufacturer Communication Number: SIL 10-1k2k-22 Rev A
TSB/Document Date: 2024-12-07
Summary
Information for launch of 9-speed transmission
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 © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 12 of 22
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 with the transmission.
Shift-by-cable and park-by-cable configurations include a selector shaft (similar to Allison 1000 Series and 2000
Series 6-speed transmissions) and a Hall effect Transmission Range Sensor (TRS) to signal selector shaft position
to the transmission TCM.
SPECIAL SERVICE INSTRUCTIONS
Transmission Range Sensor
The 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 a TRS screw and a TRS clevis pin that are not reusable after initial use
since the threads of the retention hardware 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 © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 13 of 22
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 © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 14 of 22
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 © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 15 of 22
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.
TES 389® is NOT an Allison Approved fluid for use in the 9-Speed transmission.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 16 of 22
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.
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**
75,000 Miles (120,000 km)
3,000 Hours
36 Months
General*
50,000 Miles (80,000 km)
2,000 Hours
24 Months
Severe**
50,000 Miles (80,000 km)
2,000 Hours
24 Months
All
Overhaul
Fluid
Spin-On Control
Main Filter
Internal Filter
When indicated by
controller or
48 months,
whichever occurs first
When indicated by
controller or
48 months,
whichever occurs first
Overhaul
* General Vocation: All vocations not classified as Severe
** Severe Vocation: On/Off Highway, City Transit, Shuttle Transit
Technician Training
Training to support technician capabilities for Maintenance and Overhaul is currently available. For Allison
Authorized Maintenance locations that are already compliant with the training requirements for the 1000 Series
and 2000 Series products, they will only need to complete web-based training via Allison eLEARNTM. For Allison
Authorized overhaul locations that are already compliant with the training requirements for the 1K/2K product, they
will need to complete the web-based training as well as a 2-day Instructor led training class. The 2-day Instructor
led training will be available starting in the Q1 2025.
Allison requires all 1000 Series and 2000 Series Authorized Service Facilities to have two (2) trained technicians at
each location as the new 9-Speed product is fielded in their Area of Responsibility (AOR).
Repair and Replacement Policy
Allison requires that all channel members, including Allison Authorized Distributors and Authorized Dealers,
establish a new Technical Assistance Center (TAC) case when it encounters a 9-Speed transmission complaint
or failure in the field. Having complete TAC case details will allow Allison-Indianapolis to take appropriate
actions to help satisfy the customer’s needs. Contact Allison TAC at (800) 252-5283 with complaint and failure
details to establish each case, or use the TAC "9-Speed Case Preparation" form found on the Allison HUB at
Allison HUB/Service/Technical Assistance Center (TAC)/TAC Forms/9-Speed Case Preparation, and email to
[email protected].
TAC will escalate cases to Allison’s Service Engineering team for the appropriate guidance and next steps. Channel
partners should assume there may be a need for returned parts, components or even the entire transmission.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 17 of 22
Important: Wait for Service Engineering instructions before removing the 9-Speed transmission from chassis
in the event there is additional chassis information needed beforehand.
Diagnostic Trouble Codes (DTCs)
Transmission Range Sensor (TRS) diagnostics and wiring are unique to the 9-Speed. Seven DTCs have been
developed to help locate any issues within the TRS system or associated circuit(s). Refer to the first seven DTCs
listed in Table 5 for specific DTCs. Range verification diagnostics for 7th, 8th and 9th ranges have also been
developed, along with three DTCs associated with Pressure Control Solenoid 5 (PCS5).
NOTE: 9-Speed uses PCS5 nomenclature for C6 clutch, whereas the 3000 SeriesTM and 4000 SeriesTM
use ‘PCS5’ nomenclature for retarder circuits.
Table 5. New Diagnostic Trouble Codes for 9-Speed Transmissions
DTC
DTC Name
P0706
Transmission Range Sensor 1 Circuit Performance
P0707
Transmission Range Sensor 1 Circuit Low
P0708
Transmission Range Sensor 1 Circuit High
P2801
Transmission Range Sensor 1 Circuit Performance
P2802
Transmission Range Sensor 1 Circuit Low
P2803
Transmission Range Sensor 1 Circuit High
P2805
Transmission Range Sensor Plausibility
P076F
Incorrect 7th Gear Ratio
P07D9
Incorrect 8th Gear Ratio
P07F6
Incorrect 9th Gear Ratio
P2732
Pressure Control Solenoid (PCS) 5 Stuck Off
P2733
Pressure Control Solenoid (PCS) 5 Stuck On
P2737
Pressure Control Solenoid (PCS) 5 Functional Safety Plausibility and Performance
Reference the latest revisions of the 9-Speed Troubleshooting Manual (TS8887) and Service Manual (SM8889) to
follow prescribed troubleshooting techniques, service procedures and torque specifications for the 9-Speed product.
Special Tools
To perform regular maintenance, minor repairs or overhauls on the 9-Speed transmission, Allison channel
members will need additional special tools for unique removal and installation requirements. Also available are
optional tools for ease in removing/assembling parts during repair or overhaul. A Global Tool Notification Letter
will be issued in the future announcing that these tools are available for purchase. Refer to the Global Tool
Notification Letter for purchasing guidance upon its release.
Table 6 lists the new special tools that can be purchased to overhaul and/or maintain the 9-Speed transmission.
Pictures of these tools can be viewed in Figures 18 through 23.
• Use ATT-53376 Breakout Harness and Overlay Kit with ATT-39700 Universal Breakout Box to probe
connector wiring and troubleshoot complaints.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 18 of 22
• Use ATT-54028 Selector Shaft Seal or Plug Installer to install the manual shift selector shaft seal (for
shift-by-cable and park-by-cable applications) or to install a plug in a vacant selector shaft bore (for
shift-by-wire applications).
• Use ATT-54026 Terminal Probes Kit (Set of 12) along with Jumper Wires to check continuity between
terminals and/or electrical connection points.
• Use ATT-34513 Terminal Removers (Set of 6), Deutsch, OEM 29-Way, to remove Deutsch terminals from
OEM-side, 29-Way connector wire harness ends.
• Use ATT-53370 Bushing Remover & Installer (P1-P4 Drive Sleeve and P1 Carrier
) to remove and install
bushings from the P1-P4 drive sleeve and P1 carrier.
• Use ATT-54025 Crimper w/ Case and Die (3) Kit, OEM 29-Way to crimp terminals for the OEM-side, 29-Way
transmission connector.
Special tools for 9-Speed transmissions are intended to be acquired in addition to tools required for 1000 Series
and 2000 Series 6-speed transmissions. Tools can be purchased via the Allison Special Service Tool website,
allisontools.com.
Table 6. List of Special Tools to Maintain or Overhaul 9-Speed Transmissions
Tool Description
Tool #
Figure #
Maintenance
or Overhaul
Essential or
Available
Notes
Breakout Harness and Overlay
Kit
ATT-53376
Figure 18
Maintenance
& Overhaul
Essential
Overlay (ATT-53376-1) can be
purchased separately.
Selector Shaft Seal or Plug
Installer
ATT-54028
Figure 19
Maintenance
& Overhaul
Essential
Use to install a manual
shift selector shaft seal
(Shift-by-Cable and
Park-by-Cable) or to install a
plug in a vacant selector shaft
bore (Shift-by-Wire).
Terminal Probes Kit (Set of 12)
ATT-54026
Figure 20
Maintenance
& Overhaul
Essential*
Also included in Jumper Wire
and Probes Kit ATT-39192-B.
Terminal Removers (Set of 6),
Deutsch, OEM 29-Way
ATT-34513
Figure 21
Maintenance
& Overhaul
Essential*
Also included in Electrical
Repair Kit ATT-52592.
Bushing Remover & Installer
(P1-P4 Drive Sleeve and P1
Carrier)
ATT-53370
Figure 22
Overhaul
Essential
Use to remove and install
bushings from the P1-P4 drive
sleeve and P1 carrier .
Figure 23
Maintenance
& Overhaul
Available
Individual Crimper
(ATT-54025-1) and Dies
(ATT-54025-2, -3 and -4) can
be purchased separately.
Crimper w/ Case and Die (3)
Kit, OEM 29-Way
ATT-54025
* Essential (required) Special Tool from Snap-On or can be purchased from other aftermarket source.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 19 of 22
Figure 18. ATT-53376 Breakout Harness and Overlay Kit
Figure 19. ATT-54028 Selector Shaft Seal or Plug Installer
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 20 of 22
Figure 20. ATT-54026 Terminal Probes Kit (Set of 12)
Figure 21. ATT-34513 Terminal Removers (Set of 6), Deutsch, OEM 29-Way
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 21 of 22
Figure 22. ATT-53370 Bushing Remover & Installer (P1-P4 Drive Sleeve and P1 Carrier)
Figure 23. ATT-54025 Crimper w/ Case and Die (3) Kit, OEM 29-Way
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 10-1K2K-22, Rev. A
November 05, 2024
Page 22 of 22
Figure 24. Allison Diagnostic Optimized Connection (Allison DOC 90510 and 90530 USB)
Service Parts
New service parts have been released to maintain and repair the new 9-Speed design. Reference the 9-Speed
Parts Catalog (PC8895) for serviceable part numbers, quantities per transmission, illustrations, cross sectional
drawings and support equipment options. Contact your Allison Parts Distribution Center Order Administrator to
place service parts orders.
ReTran® offerings are not currently available but are being evaluated for future release.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
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TSB/Document ID: SIL 10-1k2k-22 Rev A
Replacement Service Bulletin Number:
MFR Communication Date: 2024-11-05
MFR Internal Campaign ID/Software Version:
Communication Type: Other
NHTSA Components: POWER TRAIN
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