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Re: 96 Jimmy 4.3 Is it dead question
If I had to guess I'd say you spun a main bearing. I did it on my 96 and it only had 107,000 miles on it. The other guys are right though. You need lots of testing before you tear into the lower end. In Missouri my crank kit costed me $450 bucks and a big pain in my AXX. If it is the engine, and it's a serious problem I'd just put another engine it. It's just as easy as changing the lower end. Good luck.
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