i have a 4 s10 blazer was driving on high way yesterday and speedo started messin up and s strted down shifitng would not **** back into 3rd or 4th had to slow down to 30 got home looked in manual tested voltage going to speed sensor and was only gettin .1511 volts shouold be gettin 5 volts called repair shop and they said theses years have commen electrical problem in gear stering colom so was wondering if any one knew how to fix this or what i should try please help me out