Description
Allison Transmission WTEC 3 T Handle controller (6 forward ranges, Right-Hand, Reverse At Front)
Important notice about this item: We offer free diagnosis and bench testing of your unit. All you pay is shipping. Send us your unit and we will test your unit for functionality and codes. You will receive a comprehensive report telling you of our findings. This will give you the assurance that you made the right choice! All testing will be performed within same day of receiving item. If unit is found to be in good working order we will advise fixes for any codes that are present including troubleshoot steps and wiring drawings. FREE!
Common symptoms of failure
- No shift response or frozen display
- Gear indicator lights do not illuminate
- Truck stuck in neutral or fails to shift
- Shift pad becomes unresponsive or intermittently cuts out
- DTC codes related to selector or communication failure
Pre-replacement checklist
- Inspect shift pad connector and harness pins
- Verify 12V power and clean ground connections
- Look for signs of water intrusion or corrosion
- Scan for WTEC III codes using proper diagnostic tool
Related diagnostic trouble codes
For WTEC III systems only – 1999 to 2005
6900 series – Shift selector faults
- 6927 – Shift selector communications fault
- 6928 – Shift selector input fault
- 6929 – Shift selector display fault
- 6934 – TCM initialization failure
3500 series – Voltage and power issues
- 3511 – Battery voltage too high
- 3512 – Battery voltage too low
- 3513 – Power interruption detected
- 3514 – Power loss during programming
- 3515 – TCM power-up failure
These codes apply only to WTEC III systems. Newer Allison Gen 4+ systems use different P-codes.
Installation Notes
- Disconnect battery before installation
- Programming not required – plug and play for most WTEC III setups
- Inspect all grounds, connectors, and voltage levels before install
- DIY possible for experienced techs
- Call us for walkthroughs or install advice
Need expert help?
Reaction Force provides:
- Free over-the-phone diagnostics
- Free bench testing (send in your old unit)
- Compatibility and install support
Call Reaction Force LLC (503) 862-6322 today.
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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
What does part number 29529613 control?
This part is the T-handle shift selector used to manually shift Allison WTEC III transmissions in medium and heavy-duty vehicles.
Is 29529613 plug-and-play?
Yes, this unit is plug-and-play in WTEC III-equipped vehicles. No programming is required unless you’re swapping it into a different configuration or system.
How do I know if my 29529613 shift selector is bad?
Common signs include a blank display, non-responsive gear selection, or trouble codes like 6927 or 6929. If your vehicle is stuck in neutral or intermittently fails to shift, the shift selector may be at fault.
Can I use this in a Gen 4 or Gen 5 system?
No—this part is only compatible with WTEC III systems from 1999–2005. It is not cross-compatible with newer systems.
Is there a core charge?
Yes, a refundable core charge applies. We’ll refund your deposit once we receive your old unit. Contact us for return instructions.
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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