Quote:
Originally Posted by 92REDBIRD
When i got my new rear with 3.73s in it, I had a dakota box installed to adjust my speedo.
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Quote:
Originally Posted by jam01
there are two gears in the trans, one on the shaft and the other is in the same spot just off to the side. they are both in the tailshaft section, i used to have a pair of gears just for that combo.
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I can't speak for 3rd gens, but in older stuff there was two ways of doing it. There's a steel "drive" gear pressed on to the tailshaft of the transmission- of which there are different sizes. For each one of these "drive" gears, there's a set of plastic (with one exception) "driven" gears that connect to the speedometer cable. In order to correct your speedometer, you would change your "driven" gear. If you need to change it to a ratio that's not supported by your "drive" gear size, you have to change the "drive" gear first, to allow you to use the "driven" gear that works with your ratio. Clear as mud, I know. If you use the wrong plastic gear with the wrong drive gear it will either chew it or read erratically depending on which gears you use.
In some cases, there are speedometer conversion boxes out there which keep you from having to change the "drive" gear, or to help you get a particular ratio that isn't available.
I am pretty sure that for newer cars with an electronic speedometer, you can just reprogram it. In early electronic-speedo cars, you need a conversion box since reprogramming is not an option? Somebody correct me on this if I'm wrong.