01M 398 009 – Automatic Transmission Filter Kit (HUDSON)

Description

The 01M398009 Transmission Filter Kit is a complete service set for Volkswagen automatic transmissions. It includes the transmission filter, pan gasket, and necessary seals to support a thorough fluid service. Because the automatic transmission relies on clean hydraulic fluid to operate clutch packs and shift valves, the filter must remain free of debris.

Replacing the 01M398009 Transmission Filter Kit at the correct service interval helps maintain proper fluid flow and hydraulic pressure. Consequently, it supports smooth, consistent shifting and helps protect internal transmission components from accelerated wear.

Why the Transmission Filter Matters

Automatic transmission fluid carries heat, lubricates moving parts, and provides the hydraulic pressure needed for gear changes. Over time, metal particles, clutch material, and other debris accumulate in the fluid. Therefore, a clean filter is essential for keeping contaminants away from sensitive shift valves and solenoids.

Furthermore, a clogged filter restricts fluid flow and reduces hydraulic pressure. This can cause delayed or harsh shifting, transmission slippage, and long-term internal damage. Servicing the transmission with the 01M398009 Transmission Filter Kit is a straightforward preventative step that extends transmission life.

Signs the Transmission Filter Needs Replacement

Inspect the transmission system if you notice any of these common symptoms:

• Harsh, delayed, or erratic gear changes.

• Transmission slipping between gears during acceleration.

• Low hydraulic pressure indicated by sluggish shift response.

• Dark, burnt-smelling automatic transmission fluid during a drain inspection.

• Transmission warning lights or fault codes related to shift performance.

• Shuddering or hesitation when the transmission engages a gear.

Key Features

• OE Part Number: 01M 398 009

• Contents: Transmission filter, pan gasket, and necessary seals.

• Function: Filters debris from ATF to maintain hydraulic pressure and shift quality.

• Application: Designed for Volkswagen 4-speed automatic transmissions.

• Service: Complete kit for routine transmission fluid and filter service.

• ATF Note: 4-speed and 5-speed units require different fluid types — always verify before ordering.

Service Notes

Always verify fitment by VIN before ordering. Use only the correct automatic transmission fluid specification for the applicable unit. Furthermore, confirm whether the transmission is a 4-speed or 5-speed variant before selecting ATF, as these require different fluid types.

Compatibility

Always verify fitment by VIN before ordering. Fitment depends on transmission code, model year, and original installed part number.

Cross Reference

• 01M 398 009

Additional information