29546210 | Genuine Allison® Push Button Shift Selector

A Push Button Shift Selector 29546210 is an electronic device that allows the driver to control an automatic transmission using a set of buttons instead of a traditional gear shift lever.

General Specifications

Purpose & Function

1. Simplifies Gear Shifting

Instead of using a bulky gear lever, the driver just presses buttons labeled:
D (Drive)
N (Neutral)
R (Reverse)
Sometimes M (Manual), ↑ / ↓ (gear up/down), or Mode
This eliminates manual shifting and makes operation easier—especially for inexperienced drivers or in high-turnover fleets like buses or delivery trucks.

2. Saves Space in the Cab

• No shift lever means more legroom and better dashboard design
• Easier to move between seats in buses, RVs, or emergency vehicles
• Especially helpful in vehicles with tight cabs or need for walk-through access

3. Integrates with Electronic Transmissions

Push button selectors:
Communicate directly with the Transmission Control Module (TCM)
Allow for diagnostics, programmable modes, shift scheduling, and fail-safes
Support CAN bus or proprietary data protocols in modern vehicles

4. Enhances Safety

• Prevents accidental shifts (e.g., can't shift into reverse while moving forward)
• Built-in lockouts, fail-safes, and indicators
• Can be programmed to default to Neutral on engine shutoff

5. Improves Vehicle Ergonomics & Aesthetics

• Cleaner dashboard appearance
• Easier for OEMs to design around it
• Can include LED display for active gear, fault codes, or shift messages

6. Reduces Wear & Tear

• No mechanical linkages = less maintenance
• Less chance of driver abuse or mis-shifting
• Improves transmission life by using precise electronic commands

Signs of a Bad Push Button Shift Selector

• Doesn’t respond when buttons are pressed

• Wrong gear selected or flashing gear indicator

• Display screen malfunctioning

• Communication fault with TCM (codes present)

• Vehicle stuck in one gear (often “limp” or “neutral”)

About Allison

Allison Transmission is a world-leading manufacturer of automatic transmissions and hybrid propulsion systems, primarily used in commercial-duty vehicles. Founded in 1915 and headquartered in Indianapolis, Indiana, Allison is known for producing durable, fully automatic transmissions for trucks, buses, military vehicles, construction equipment, and energy sector applications.