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I want to gain info from all the experienced jeepers- When would you recommend changing the timing belt/ chain on a TJ?

I have a 2002 Wrangler X 4x4 and 4.0 manual 5 speed with about 142,000. Nothing is wrong with the way it runs but I like to do upkeep maintenance BEFORE issues arise. Also, I don't know if I have belt or chain so is there a difference in how long one will last in comparison to the other?
 

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The 4.0L has a steel timing chain that is good at least until the engine requires a major overhaul. Even then it is only replaced if it has stretched. Only the newer 2.4L and 3.7L engines use rubber timing belts. :)
 
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