The Toyota Estima ACR30 and Toyota Alphard ANH10, both equipped with the 2.4L 2AZ-FE engine and 2WD drivetrain, use similar automatic transmissions, but with some model-specific differences in tuning and control systems.

Here’s a detailed description of the gearbox (automatic transmission) used in these vehicles:

🔧 

Transmission Type

• Model: U241E or U140E (depends on production year and region)
• Type: 4-speed Automatic Transmission (Electronically Controlled)
• Drive: Front-Wheel Drive (2WD)

⚙️ 

Gear Ratios

• 1st Gear: 3.943
• 2nd Gear: 2.197
• 3rd Gear: 1.413
• 4th Gear (Overdrive): 1.020
• Reverse: 3.145
• Final Drive Ratio: Typically 3.94 (can vary slightly by model)

🛠️ 

Key Features

• ECT (Electronically Controlled Transmission): Adjusts shift timing based on throttle position, vehicle speed, engine load, and other factors for smooth performance.
• Lock-Up Torque Converter: Improves fuel economy by reducing slip at higher speeds.
• Shift Logic: Adjusted for different driving conditions (e.g., hill start assist, cruise control).
• Cooling System: Integrated ATF (automatic transmission fluid) cooler to maintain transmission temperature.

📌 

Differences Between Estima ACR30 and Alphard ANH10 Gearboxes

• Both vehicles use similar transmissions, but:
  
• ECU Tuning: Slightly different shift programming for comfort in Alphard (luxury MPV) vs. a more practical balance in Estima.
• Mounting and Linkage: Minor differences in bracket placements and control linkage routing.
• Transmission code labels: May differ slightly due to factory part number designation.
• 
  

🧰 

Maintenance Notes

• ATF Type: Toyota Type T-IV ATF (use only recommended fluid)
• Change Interval: Every 40,000 to 60,000 km (check owner’s manual)
• Common Issues:
  
• Harsh shifting or delayed engagement (often caused by old or incorrect ATF)
• Solenoid or valve body issues in high-mileage units
• Worn clutch packs or torque converter in poorly maintained units
• 
  

Let me know if you want a wiring diagram, ECU pinout, or gearbox swap compatibility details!