Timing chains stretch over time. If left untouched, they can begin jumping teeth on the camshaft and crankshaft sprockets. This will change your timing and will do major damage to your Jeep's engine. It is recommended that you change the timing chain and sprockets together for the best fit. Omix-ADA offers high quality replacement timing chains and kits to keep your Jeep running smoothly for years to come. This product ships in approximately 1 days