Allison Transmission shift pad #29551555

Allison 4th/5th Gen Shift Selector Assembly Part #29551555

Code: 29551555

Allison 4th/5th Gen Shift Selector Assembly 29551555

Reaction Force LLC provides FREE BENCH TESTING and over-the-phone diagnostics. Questions about your Allison part? Call us at (503) 862-6322.

Condition: New

Recalibration: Included

Compatible years: 2006-2024

Warranty: 6 months

$888.93

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Description

Allison 4th/5th Gen Shift Selector Assembly Part #29551555

Compatible years: Approx. 2006–2024

Allison Shift Selector 29551555 4th/5th Gen Pushbutton Assembly

Compatible years: approx. 2006–2024

The Allison 29551555 is a pushbutton shift selector in 4th and 5th Generation Allison automatic transmissions. This selector allows drivers to manually select gears and communicates directly with the vehicle’s transmission control module (TCM).

This unit is offered in new condition, pulled from working systems and visually inspected for function and wear. It’s a cost-effective option for customers seeking a reliable OEM replacement.

Common symptoms of a bad shift selector

  • Pad is unlit or does not respond

  • Gear indicator flashes or displays incorrectly

  • Buttons are physically stuck or non-functional

  • Transmission won’t shift out of neutral or drive

  • DTCs such as P0700, U0101, or P0919 appear

  • Gear selection feels delayed or unrecognized

If you’re experiencing any of these issues and your wiring and TCM check out, the shift selector is likely the cause.

Pre-replacement checklist

Before replacing your selector, confirm the following:

  1. Voltage present at selector plug – Use multimeter to confirm input power

  2. Inspect for water intrusion or corrosion – Inside the pad or harness

  3. Scan for communication or switch input codes

  4. Test TCM communication – Eliminate module failure

  5. **Try known-good selector or send to Reaction Force for free bench testing

Related diagnostic trouble codes

  • P0700 – Transmission system fault

  • U0101 – Lost communication with TCM

  • P0919 – Gear shift position fault

  • P0826 – Shift switch input issue

  • 2312 – Shift selector failure

These codes often appear when the selector fails to communicate or send input signals properly.

Installation notes

  • Disconnect battery before installation

  • Mount securely in dash with factory hardware

  • Connect wiring harness securely—check pins for damage or corrosion

  • If necessary, program the selector via TCM software after install

  • Clear any stored codes and verify proper display function before road test

Need help?

Reaction Force provides:

  • Free diagnostics over the phone

  • Bench testing of your current selector

  • Advice on Gen 4 vs. Gen 5 compatibility

  • Help matching TCM and selector assemblies

Call (503) 682-6322

Name

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.

Please see our warranty, shipping, refund, and return policies.

Frequently asked questions

1. What does the 29551555 selector do?
It lets the driver select transmission gears electronically and communicates directly with the TCM.

2. What’s the difference between 29551555 and 29551556?
Both are pushbutton selectors for Gen 4/5 systems. 29551556 is a newer revision; 29551555 is often fully compatible depending on programming.

3. Is this plug-and-play?
In many vehicles, yes—but some may require a quick calibration via scan tool.

4. What’s the warranty on a selector?
Warranty is 6 months from Reaction Force.

5. Can I return this part if it doesn’t solve the issue?
Yes, as long as it’s within the return window and undamaged. Please see our warranty and returns page for more details.

Additional information

Weight 2.75 lbs
Dimensions 9 × 9 × 4 in
Applications for 29551555

This pushbutton selector is used in Allison transmission families: 1000 Series 2000 Series 3000 Series 4000 Series
Common vehicles

Chevy/GMC HD trucks with Allison transmissions Isuzu NPR/FTR series Freightliner step vans and utility trucks Blue Bird and Thomas Built buses Municipal fire trucks and emergency vehicles RVs and vocational fleet vehicles Note: Works with both Gen 4 and Gen 5 TCMs and may replace part #29551556 in many applications.
Product specifications

Part number: 29551555 Type: Pushbutton shift selector Compatibility: Allison Gen 4 and Gen 5 systems (2006–2024) Condition: Good (used), visually inspected Programming: May require calibration depending on vehicle Warranty: 30-day exchange guarantee

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    Allison 29522940 WTEC II Pushbutton Shift Selector – Integral

    The Allison 29522940 is a WTEC II pushbutton shift selector used with Allison automatic transmissions in medium- and heavy-duty applications. This is the integral-style selector configuration, designed for dashboard mounting with a ribbon connector at the rear of the unit.

    This remanufactured Allison 29522940 shift selector is bench-tested before shipment for proper display operation and pushbutton response. The 29522940 is identified by Allison service information as the WTEC II PBSS (push-button shift selector) used with the R29517003 remanufactured ECU when servicing the corresponding shift selector used in the integral shifter/ECU configuration.

    Part number: 29522940
    Part type: WTEC II pushbutton shift selector
    Configuration: Integral / dashboard-mounted
    Connector: Rear ribbon connector
    Condition: Reman
    Related / superseded number: 29507938

    Verify the part number and connector configuration on your existing selector before ordering to confirm that this is the correct replacement.

    Free Bench Testing

    Already have a 29522940 that isn’t working correctly? Send it to Reaction Force for free bench testing. You pay only the shipping.

    Our reman units are bench-tested for proper functionality, including display operation and button response.

    Please review our Core Policy

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