This component is the smaller Piston assembly for the pneumatic gear shift control cylinder, often associated with the main gear Group Change (Synchronized) function within the Scania heavy-duty gearbox. This piston converts air pressure from the solenoid valve block into the necessary mechanical movement to shift between the main gear groups. It is a critical wear item for maintaining smooth and reliable gear selection. This piston (OE 1779373 / 1940000) is compatible with a wide array of Scania P, G, R, and T series trucks, including the P124 and P420, utilizing the highly common GRS/GRSO transmissions.

📌 OE Reference Number: 1779373, 1940000

📌 Suitable Vehicle Model: Scania P, G, R, T-Series (Focusing on 4-Series, 5-Series, and onwards, e.g., P124, P420) equipped with GRS(O)905, GR(S)895, GR(S)925, GR875 transmissions.

📌 Fitting Position: Gearbox (Transmission), Gear Shift Cylinder (Internal component)

📌 Category: Gearbox Components / Pneumatic Piston

✅ Key Features:

• Group Change Actuator: The smaller mechanical component inside the pneumatic cylinder that executes the main gear group shifts.
• "SMALL" Piston: Refers to the secondary shift control piston, typically the smaller of the two used in the shifting mechanism.
• Wide Compatibility: Fits numerous generations of the widely used Scania GRS/GRSO gearboxes.
• OE Equivalent Quality: Manufactured for precise fitment and sealing within the cylinder bore to ensure accurate gear engagement.