speedometer dies

:screwy: hey folks, have an 86 formula trans am, 305tpi, speedo started floppin up and down, now she don't work much at all, anybody have this prob before.
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I have the same promblem with my 86 Firebird and someone told me that it was the sensor near your tire or something

ACTUALLY IT IS THE GEAR ON THE SPEED SENSING UNIT AT THE REAR OF THE TRANNY HAS PULLED BACK FROM THE WORM, IT IS A PLASTIC GEAR, THE FIX IS A .35c WASHER MOUNTED BEHIND THE GEAR, 1/2 HR TO FIX, PLUS A LITTLE TRANNY FLUID. DID THAT AND HAVEN'T HAD A PROBLEM SINCE.