Question about 1990 Ford Thunderbird
I think these were still cable operated speedometers during this year.you would check them the same way you would check any gm car unless you haven`t been in the trade that long.find the speedo cable were it hooks up to the speedo head and release it and pull it down where you can get to it.spin the cable by hand to see if it spins freely and not tight or binding if so pull it out of the outer cable and visually inspect it.before re-installing lube the cable with the drive wheels off the ground have someone spin the wheels and watch the cable to see if it spins.if not then you will have to pull the speedo drive out of the transmission to inspect the drive and driven gears for damage to the teeth.if you find damage then replace components.they go by color of the gear and the number of teeth when ordering part.if the gears are good then check the drive gear in the tranny to see if it turns if it does then the problem is probably the speedo head.some where cable/electric operated.if the cable is good then check the electrical connection at the transmission.the electrical portion does seize up and need replacing.there is also a speedo transducer in the back of the instrument cluster that can go bad,this is only if its not cable operated.
Posted on Apr 09, 2011
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Posted on Jan 02, 2017
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