Short answer: Never. It doesn't have one.
Long answer: The engine 4.0L 6cyl uses a chain, and those are usually for the life of the engine. There is a very small chance that this chain fails. In this case it will probably produce a rattling noise before it cause problems.
The 2004 Jeep Grand Cherokee does not have a timing belt. It has a chain. No scheduled replacement is necessary.
timing chain not belt don't replace if it is not making noise i have had over 200k miles and never replaced on
They don't have timing belts!! There is a chain that never fails.
The 2004 Jeep Grand Cherokee does not have a timing belt. It has a chain. No scheduled replacement is necessary.
The 2004 Jeep Grand-Cherokee has 12 valves.
The maximum payload of the 2004 Jeep Grand-Cherokee is 1100 lbs..
The 2004 Jeep Grand-Cherokee's turning circle is 37.4 ft..
The curb weight of the 2004 Jeep Grand-Cherokee is 3790 lbs..
The 2004 Jeep Grand-Cherokee has a drag coefficient of .45 Cd.
A seat from a 1999-2004 Grand Cherokee is what fits in a 1999-2004 Grand Cherokee.
The 2004 Jeep Grand-Cherokee has 12 valves.
The 2004 Jeep Grand-Cherokee has overhead valves (OHV).
The 2004 Jeep Grand-Cherokee is a gas-powered vehicle.
The 2004 Jeep Grand-Cherokee has a 4-speed automatic.
The 2004 Jeep Grand-Cherokee has an inline 6 engine.
The maximum payload of the 2004 Jeep Grand-Cherokee is 1100 lbs..
The 2004 Jeep Grand-Cherokee is 15 ft. 1.3 in. (181.3 in.) long.
The 2004 Jeep Grand-Cherokee's turning circle is 37.4 ft..
The curb weight of the 2004 Jeep Grand-Cherokee is 3790 lbs..
The 2004 Jeep Grand-Cherokee has a drag coefficient of .45 Cd.
The 2004 Jeep Grand-Cherokee runs on regular unleaded.