This article addresses slippage issues in the automatic transmission of a 90 Series Prado (3.4L Petrol), specifically focusing on slippage in reverse gear under load and a potential whining noise.
Problem
The vehicle exhibits the following symptoms:
- Slippage in reverse gear, particularly when under load (e.g., reversing uphill).
- A slight whining noise when in gear.
Potential Solution
- Check Transmission Fluid Level and Quality: Low transmission fluid level can cause slippage, especially in reverse under load. Ensure the fluid level is correct after a 30-minute drive. The quality of the fluid should also be inspected. If the fluid is dirty or degraded, a fluid and filter change may be necessary.
*Note: It is generally believed the A340 transmission is very reliable if properly maintained.
Relevant Parts
- Automatic transmission fluid compatible with the A340 transmission.
- Transmission filter for the A340 transmission.
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