NHTSA ID Number: 11032069
Manufacturer Communication Number: SIL 06-WT-22 Rev A
TSB/Document Date: 2026-05-04
Summary
Announces update to torque converter clutch valve and pressure control solenoid, with information on backward compatibility
Revisions to this document are noted by a
stripe in the left-hand margin
SUBJECT:
SIL 06-WT-22, Rev. A
April 14, 2026
Page 1 of 2
Addition of Outside Diameter (OD) Grooves to TransID (TIDA & TIDB) Torque Converter Clutch
(TCC) and Pressure Control Solenoid (PCS) Valves
MODELS AFFECTED:
3000 Series™ and 4000 Series™ — All Models
SERIAL NUMBERS AFFECTED:
TCC Valve — Beginning with:
Indianapolis 3000: 6511846584
Indianapolis 4000: 6610660038
Hungary 3000: 6520249099
Hungary 4000: 6620041490
PCS Valve — Beginning with:
Indianapolis 3000: 6511854021
Indianapolis 4000: 6610663500
Hungary 3000: 6520248051
Hungary 4000: 6620041676
Introduction
As a continuous product improvement, a change has been made to the 3000 and 4000 Series TCC Valve and
PCS Valve. The change includes the addition of OD grooves to each valve. Changes for both the TCC Valve
and PCS Valve are completely forward and backward compatible with existing transmissions. For information
regarding part numbers affected, see Table 1. For part identification, see Figure 1.
Service Procedures
All related service procedures remain unchanged.
Service Parts
Former TCC Valve and PCS Valve part numbers have been completely cancelled.
SB / SL8967EN
xi76657
Copyright © 2026 Allison Transmission, Inc. All Rights Reserved.
SIL 06-WT-22, Rev. A
April 14, 2026
Page 2 of 2
Parts Catalog
The affected Allison Transmission Parts Catalogs will show the related part number changes via the History
button.
Table 1. TCC Valve and PCS Valve Part Numbers
Part Name
Usage
Former P/N
Current P/N
TCC Valve
TCC/Lockup — All TIDA & TIDB
29542937
29566114
PCS Valve
PCS 1, 2, 3, 4 — All TIDA & TIDB
29542939
29566113
Added OD Grooves
FORMER
TCC VALVE
(P/N 29542937)
CURRENT
TCC VALVE
(P/N 29566114)
Identification Bands
FORMER
PCS VALVE
(P/N 29542939)
Added OD Grooves
CURRENT
PCS VALVE
(P/N 29566113)
7001303
Figure 1. TCC Valve and PCS Valve Identification
NOTE: Removal of identification bands from shank of former PCS Valve P/N 29542939 has no effect on
compatibility.
NOTE: Reduction in diameter of small end of former PCS Valve P/N 29542939 has no effect on
compatibility.
Copyright © 2026 Allison Transmission, Inc. All Rights Reserved.
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TSB/Document ID: SIL 06-WT-22 Rev A
Replacement Service Bulletin Number:
MFR Communication Date: 2026-04-14
MFR Internal Campaign ID/Software Version:
Communication Type: Other
NHTSA Components: POWER TRAIN
MFR Component System: Transmission
MFR Component Subsystem:
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