NHTSA ID Number: 10156677
Manufacturer Communication Number: TT7399EN
TSB/Document Date: 2019-04-08
Summary
Tech Tip concerning Transmission Control Module (TCM) Recalibration for Kenworth
TT7399EN
October, 2013
Page 1 of 7
SUBJECT:
Transmission Control Module (TCM) Recalibration for Kenworth
MODELS AFFECTED:
Kenworth
T800, W900, and C500 models built between 1/25/13 07/15/13 and equipped
Allison 4000 Series Product Family Transmissions and ISX Family 1 engines.
NOTE: Kenworth dealers are asked to coordinate with Allison distributors/dealers for repairs as outlined
in Kenworth Technical Information Bulletin (TIB) 27002. Kenworth has agreed to utilize and pay the
Allison service channel for the repairs.
Background:
Kenworth manufacturing specified the incorrect torque converter type used with 5th Generation Controls
transmissions and ISX Family 1 engines. Consequently, transmissions and calibrations were installed that
contain either a TC541 or TC551 torque converter instead of the required TC561 configuration. Kenworth TIB
27002 instructs Kenworth dealers to contact Allison Transmission distributors/dealers to replace the currently
installed torque converter pump element with P/N 29514713; thereby converting the torque converter to a TC561
configuration.
This Tech Tip supplements Kenworth TIB 27002 by outlining the procedure for obtaining a replacement
TCM calibration that corresponds to a TC561 torque converter after the currently installed pump element has
been replaced.
Refer to Table 1 for chassis numbers that are addressed in Kenworth TIB 27002.
MQ
420915
Copyright © 2013 Allison Transmission, Inc. All Rights Reserved.
TT7399EN
October, 2013
Page 2 of 7
Table 1. Kenworth Chassis Numbers
Kenworth
Model
Chassis
Initial Configuration
Final Configuration (after repairs)
Transmission
Serial
Number
E
Number
G
Number
Torque
Conv.
Group
Torque
Conv.
Series
E
Number
G
Number
Torque
Conv.
Group
Torque
Conv.
Series
396153
T800
6610367902
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
396794
T800
6610366983
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
396795
T800
6610366865
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
369499
C500
6610370256
E018233
G018826
21926
TC561
388500
T800
6610363916
E017578
G019084
21928
TC541
E017544
G020240
21926
TC561
388665
T800
6610364100
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
390774
T800
6610365897
E017578
G019084
21928
TC541
E017544
G020240
21926
TC561
392054
T800
6610365766
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
392551
W900
6610366186
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
392552
W900
6610366185
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
392553
W900
6610366318
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
392554
W900
6610366317
E017581
G018837
21927
TC551
E017481
G018816
21926
TC561
392702
T800
6610366320
E017742
G018818
21927
TC551
E017592
G018817
21926
TC561
392703
T800
6610366319
E017742
G018818
21927
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TSB/Document ID: TT7399EN
Replacement Service Bulletin Number:
MFR Communication Date: 2013-10-02
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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