Mitsubishi W4A33 / F4A33 Planet Assembly 1990-1999

Mitsubishi W4A33 / F4A33 Planet Assembly (1990–1999)

The Mitsubishi W4A33 / F4A33 planet assembly is a vital internal transmission component for vehicles equipped with the W4A33 or F4A33 4-speed automatic transmission from 1990 through 1999. This planetary gear set transfers engine torque through the transmission while maintaining smooth gear engagement and balanced load distribution. Its precision-engineered gears and bearings ensure reliable power delivery, improved shift performance, and long-term durability.

Over time, worn gears, damaged pinions, or failing bushings can cause slipping, harsh engagement, noise, or premature wear of internal transmission components. Replacing the W4A33 / F4A33 planet assembly restores proper torque flow and smooth gear operation. Installing a new planetary assembly during a rebuild also protects clutches, bearings, and output shafts, helping maintain reliable performance and extending the life of the transmission.

This planet assembly is designed specifically for Mitsubishi W4A33 and F4A33 transmissions. Always verify the transmission code and model year before ordering, as similar Mitsubishi units may require different planetary configurations. Proper identification ensures correct fitment, optimal torque distribution, and smooth shifting.

For best results, pair this planet assembly with a full rebuild kit, including new clutches, thrust washers, seals, and friction components. Customers can also explore related components on our site, including W4A33 / F4A33 rebuild kits, valve bodies, torque converters, and hard parts, to complete a full transmission overhaul.

W4A33 / F4A33 Transmission Parts

Vehicle Compatibility

Mitsubishi Applications

• Mitsubishi Galant (4-cylinder & V6): 1990–1999

• Mitsubishi Eclipse (4-cylinder & V6): 1990–1999

• Mitsubishi Diamante (V6): 1990–1999

• Mitsubishi 3000GT / GTO: 1991–1999

Fitment Notes

This planet assembly fits Mitsubishi W4A33 / F4A33 transmissions only. Always verify the transmission code, engine type, and production year before purchase. Proper verification ensures correct torque transfer, smooth gear engagement, and extended transmission life.

Consult official Mitsubishi service manuals for installation procedures and torque specifications.

Below is the diagram of the W4A33 transmission!

W4A33 / F4A33 Transmission Diagram