Originally Posted by cvc
is it possible that when this was replaced in 2001 that they put a sleeved one on ? How many miles do they usually go before they let loose ?
Doubtful that you have a sleeved upper. I don't think we've ever heard of shops that offered homemade sleeved units to customers, and until recently I don't believe there were any widely available on the market (unless your mechanic invested in a Kenco kit). Check receipts for the work done, or try to contact the mechanic that performed the repair and ask him if he would have used a sleeved UIM.
Again, mileage before failure can vary enormously. Sometimes they go after 50,000, and sometimes they last 100,000 or more. Pretty big window of opportunity for failure.