if the noise gets louder with rpm's dnt drive it anymore, it may salvageable at this state, if you drive until it comes apart, then well, a new engine is in the future, I have seen low mileage engines 20k-50k sell for $800-$1200
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1999 MAZDA 2500SE, 2.5L 4-clanger, 5 speed, Green n slow. Rangers as daily drivers since 1988.
ASE Certified Mechanic, Builder of Show Destroying Protouring and Classic cars..