PDM (TSK4) Transmission Sleeve Kit - Subaru

PDM Transmission Sleeve Kit (TSK4) for Subaru WRX STI

Manufacturer: Subaru
Original OEM Part Number: 30502AA130
Supersession: 30502AA080
PDMUSA Part Number: TSK4
Replacement Bearing: TSK4-B
Transmission Type: 6-Speed Manual (Pull-Type Clutch)

✅ Vehicle Compatibility & Chassis Codes

🌎 U.S. Market

🌍 Global Market

📌 Note: Confirm transmission type and bearing surface before ordering. Applicable only to pull-type clutch systems.

💪 What’s in the Kit?

• CNC-machined stainless steel sleeve

• Oversized clutch release bearing (sleeve-specific)

• Bearing clip

• Hardware

• High-temp specialty grease

• Detailed installation instructions

🔧 Symptoms Fixed by the TSK4 Kit

• Clutch chatter or shudder

• Excessive noise during clutch operation

• Sticky or stiff clutch pedal

• Rough or inconsistent pedal feel

• Premature wear or failure of clutch components

• Surface wear on the aluminum transmission case extension

⚠️ The Problem with OEM Design

Subaru’s original cast aluminum bearing sleeve design wears out prematurely. This creates:

• Vibration and excessive clutch noise

• Clutch misalignment and release issues

• Ongoing damage to transmission case components

✅ The TSK4 Kit Advantage

The TSK4 is a long-term solution that addresses the underlying issue:

• 🛡️ Durable stainless steel sleeve eliminates future wear

• 🔧 No machining required; installs in minutes

• ⏳ Extends clutch and transmission lifespan

• ♻️ Fully reversible for service or upgrades

Clutch Release Bearing Installation Notice

We have encountered instances of release bearing damage caused by improper installation, specifically cracking or failure of the plastic base. This is a known issue and is often related to installation technique.

With pull-style clutch systems, the release bearing must be installed onto the clutch fork first. After the engine and transmission are mated, the bearing will properly engage and snap into the pressure plate when the clutch is actuated.

A common point of confusion occurs during removal. When the transmission is separated, the release bearing typically remains attached to the pressure plate due to its locking mechanism. This can lead to the incorrect assumption that the bearing should be installed onto the pressure plate prior to reassembly.

This is incorrect.

If the release bearing is pre-installed onto the pressure plate before reinstalling the transmission, it may prevent proper alignment with the clutch fork. This misalignment can place excessive stress on the bearing, often resulting in damage to the plastic base.

To prevent damage:

• Always install the release bearing onto the clutch fork first
• Do not pre-install the bearing into the pressure plate
• Allow the bearing to engage naturally during clutch operation after reassembly

Failure to follow proper installation procedures may result in premature bearing failure.

🌍 Trusted Across Global Markets

Relied upon by Subaru performance shops, rally teams, and STI enthusiasts worldwide.

🔍 Alternate Listings (Search & Compatibility)

30502AA130 / 30502AA080
TSK4 Subaru Sleeve Kit
WRX STI Clutch Snout Repair
Subaru 6-Speed Pull-Type Clutch Fix
Subaru STI Transmission Sleeve Upgrade