Rebuild kits are available from just about any Fox shock retailer (including ourselves), though Fox recommends sending in the shocks for rebuilding at either Fox itself or Fox-approved suspension shops. Mileage for a rebuild can vary pretty widely depending on how you're using your truck. Trucks that see serious off-road use, could require a rebuild at as little as 10,000 miles, while trucks that mostly used on the street can get 50,000 miles or more.