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timing chains do stretch and should be changed out about every 100K or so. When the chain stretches and wears it will throw off your timing, making the engine run less efficiently. I changed mine out at 95K when my water pump died, the timing chain is right there might as well change it and get a new crank seal, as they like to leak. Not sure what engine you have but mines the V8. Hope this helps.
 
Well you keep driving on yours, but if you were to take it out and check it beside a new one you'll see yours grew about 1/4". Ask a mechanic, for the most part if you only drive it on the street you'll be fine, but if you beat on it on the trails you have a good chance of breaking the already weak CHAIN, Ill ask my mechanic again, oh wait, that's right I am one, and have been one for the last 10 years or so, but you do what you want its your call, a $70 chain and gear set is a great investment for the older higher mileage engine, and also good insurance that it won't leave you stranded on the trail, [smilie=bowdown.gif] your the man.
 
I guess your not to mechanically inclined, I did mine in less than 5 hours. but 2 days damn that's a long time are you a union man?
 
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