Here’s a clear description of the Proton Waja MMC automatic gearbox (commonly referred to as the auto gearbox in the Waja MMC model):

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Proton Waja MMC Auto Gearbox – Overview

• The Proton Waja MMC (Minor Model Change) is a facelifted version of the original Waja, produced mainly in the early-to-mid 2000s.  
• The automatic gearbox fitted to many Waja MMC models is a 4-speed automatic transmission. It’s a front-wheel-drive (FWD) type matched with the car’s engines (often the Mitsubishi 4G18 1.6L engine).  

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Transmission Type

• 4-speed automatic transmission (4AT) — this means:
  
• Four forward gear ratios for gear changes.
• A conventional automatic torque-converter setup.  
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Common Gearbox Features

• Electronically controlled automatic shifting
  The gearbox shifts gears based on engine speed, throttle position, and load — typical of an older-generation automatic.  
• Gear selector positions include:
  
• P (Park)
• R (Reverse)
• N (Neutral)
• D (Drive)
• 3, 2, L (lower gears for more engine braking or slow speed control)  
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• Some Waja MMC gearboxes also have an Overdrive (O/D) button, which helps improve fuel economy on highways.  

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Typical Pairings

• Most commonly paired with the 1.6L Mitsubishi 4G18 engine in MMC cars.  
• Later Waja variants (not always MMC) could also use other engines with similar type automatic transmissions.  

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Driving Characteristics

• Designed for smooth, comfortable city and highway driving, not aggressive or sport-oriented performance.  
• Being a 4-speed box, it typically runs at moderate engine RPMs for cruising speeds, balancing economy and comfort.  

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Maintenance Notes

• Regular Automatic Transmission Fluid (ATF) changes are important for durability.  
• Symptoms of gearbox wear or need for service include jerky shifts, slipping between gears, or delay in engaging (common in older autos).  

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Summary

Proton Waja MMC automatic gearbox is a classic 4-speed automatic FWD transmission typical of early 2000s sedans, programmed for everyday driving ease rather than performance. It’s robust with proper care and familiar to many mechanics in Malaysia. 

If you want, I can also give you the gearbox model code (e.g., specific Mitsubishi/Aisin code) or common maintenance/repair tips for this transmission.