Fox Fork FIT4 Cartridge Rebuild Seal Kit 36 & 40

Fox FIT4 Cartridge Rebuild Seal Kit – 36 & 40

This is a genuine Fox seal kit made for servicing the FIT4 damper cartridge in Fox 36 and 40 suspension forks.

What It Does:

• Replaces the internal seals inside the FIT4 damper, which controls how your fork handles bumps and adjusts between Climb, Trail, and Descend modes.
• Helps fix leaky, sticky, or underperforming dampers and keeps your fork feeling smooth and consistent.

What’s Included:

• All the seals and o-rings needed to fully rebuild the FIT4 damper (not the air spring or lower legs).
• Works with both 36mm and 40mm Fox forks that use the FIT4 damper.

When to Use It:

• If your fork feels inconsistent, loses damping, or is due for a major service (typically every 100–200 hours of ride time).
• Perfect for riders who want to keep their fork running like new.

Note:

This kit is for the FIT4 cartridge only — if you also need to service the air spring or dust seals, you’ll need additional kits.