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Bought a 99 Dakota with a 3.9 v6. clean little truck, but it needs a motor.now my question is the guy said it locked up going down the road. no holes in the block, but you aint moving the crank--tried with a bar. So what would have done this?havent pulled it yet, may just sell like it is, dont have time.unless someone feels its a easy job and possible easy fix in the motor.So what do you think guys?

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Spun bearings... due to lack of oil

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with Mike on this..most likely
just drove the hell out of it and hardly
(if ever) changed/re-filled the oil.