Description
Allison Transmission Shift Selector WTEC 3
Specific to International Trucks
No core charge! In fact we will buy your core! $75.00 will be refunded to your account once we receive the bad shift pad back from you.
6 month warranty. Compatible with 29538376 CEC2 controller for Allison 5000, 6000, 8000 and 9000 series transmissions.
The 29537631 Allison WTEC III Shift Selector is an OEM electronic push-button shift pad designed for use in International trucks equipped with Allison automatic transmissions. Common in late 1990s to early 2000s vocational vehicles, this selector provides precise gear control, direct communication with the TCM, and clear diagnostic feedback.
Professionally inspected and bench-tested by Reaction Force, this selector is ready to install and built to last.
Signs Your 29537631 Shift Selector May Need Replacement
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Gear indicators flash or don’t light up
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Selector is unresponsive when buttons are pressed
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Vehicle stuck in “N” or “limp” mode
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Unexpected shifting or gear skipping
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Fault codes pointing to selector or comms failure
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Wear and tear: cracked casing, sticky buttons, or display failure
Diagnostic Codes & Symptoms
For vehicles using WTEC III controllers (1996–2006 era), these symptoms and codes are often related to a failing shift pad:
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Flashing “N” – Communication issue between TCM and shift selector
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Code D1 or D2 – Input failure or selector circuit issue
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Gear doesn’t engage despite pressing button – Internal circuit fault
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No communication detected by scan tool – Selector may be dead or miswired
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Selector stuck in one mode – Possible short, pad failure, or TCM misread
Pro tip: If you’re chasing selector-related problems, always check for harness corrosion or moisture at the connector.
Pre-Installation Checklist
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Confirm part number: 29537631 printed on back of unit
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Verify vehicle uses WTEC III control system (not Gen 4+ or 5th Gen TCM)
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Disconnect batteries before installation
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Inspect harness and connector pins for corrosion or damage
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Mount with proper bracket alignment and torque
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Clear fault codes after install and confirm gear display function
Send us a message and we will go to work for you.
Images are for representation purposes only. For reman and RTO purchases a photo of the actual item you are receiving will be sent for approval prior to shipping.
Frequently Asked Questions (People Also Ask)
1. What does the 29537631 shift selector do?
It’s the driver interface for gear selection — sending commands to the TCM and displaying gear status. This model is push-button and commonly used in Internationals with Allison WTEC III.
2. How do I know if mine is WTEC III?
WTEC III systems were common in Allison-equipped vehicles from the mid-90s to early 2000s. The selector will usually have 2–6 buttons and a digital gear display. Check the TCM label or consult your wiring diagram.
3. Can I use a different selector if mine is discontinued?
Some WTEC III selectors are interchangeable, but using the wrong part number can cause comms failures or incorrect behavior. Stick with exact-match numbers like 29537631 when possible.
4. What causes a shift pad to fail?
Moisture intrusion, worn contacts, or voltage spikes. In many cases, the internal circuits simply wear out after years of heavy-duty use.
Need Help Confirming Compatibility or Placing an Order?
Our team specializes in Allison electronics from this era. If you’re unsure whether this is the right selector for your vehicle, we can walk you through it — no guesswork required.
Call Reaction Force now to confirm compatibility: (503) 682-6322
Fast shipping. Friendly support.
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Core Deposit Policy – Parts
Core deposit is fully refundable once complete, “like for like” unit is returned to RF LLC. Buyer pays return shipping and is responsible for any loss of item during shipping. If the unit returned is incomplete or not “like for like” a pro-rated refund will be applied.
Please see our warranty, shipping, refund, and return policies.
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