as to a sigh of failure it sounds like to me you have already started to see them. everything you have said sounds all to familure... you will most likely be able to limp it for a little while but in the end it will go. its just scary i changed mine early because i was scared of what else coule be affected. better safe then sorry in my mind. i hope this is of any help

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2004 ford ranger xlt 4x4 4.0L 5 speed manual super cad F.O.R.D FIRST.ON.RACE.DAY!!!!!