Hopefully what he said ^ or a bad sensor. A friend of mine had the same problem I was talking to him on the phone while he was driving all was fine just no speedo no weird noises or anything then boom. Turns out his spiders let go and chewed up the tone ring in the rear end that the speed sensor gets it's signal from. If you rule out the sensor and wiring I would probably pop the rear diff. cover and have a look. Good luck
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01 dodge ext. cab single wheel ton 500cc ppump 24deg. full cuts, 4000gsk, FASS180 55psi .093 lines and tubes, 6x12, o-ringed ARP's and marine gasket, 64/71/14 over s475. Billet 47rh
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