Inner CV/PTJ Axle Boot for Subaru

Keep your front driveshaft healthy with this inner tripod joint boot ️. It seals high‑moly grease inside the PTJ (plunging tripod joint) and blocks water, salt, and road grit. Fresh, flexible rubber prevents noise, vibration, and costly axle failure—exactly what your Subaru’s drivetrain needs for smooth acceleration and long life.

Why this part is needed

Without a tight boot, grease leaks out and contamination gets in. The tripod bearings then run dry, overheat, and wear fast. Replacing the boot early saves the joint and avoids a full axle swap .

How it works

The ribbed boot flexes with suspension travel while allowing the joint to plunge in and out. Proper clamps hold the seal on the cup and shaft, keeping lubricant where it belongs and maintaining joint alignment under load.

What happens if it’s broken

Typical signs: grease splatter on subframe, cracks or tears, clicking on take‑off, shudder under throttle, and vibration at speed. Left unchecked, the joint pits and binds, leading to knock, boot blowout, and possible axle failure ⚠️.

Tech tips

• Clean the cup and bearings thoroughly; pack with quality moly CV grease.
• Use new clamps and crimp to spec; avoid overfilling.
• Check seal grooves and vent the boot to prevent ballooning.

Compatibility

• Legacy
• Tribeca
• Impreza