Most transmissions have a plastic gear mounted on the uotput shaft that connects to a gear on the end of the speedo cable or electronic sender unit for the speedo. This gear is normally driven by a steel ball embedded in the shaft and the gear has a slot that makes the ball act as a drive key. I would check by removing the sender unit/cable and seing if the gear can be rotated around the shaft. If it can be moved take the unit back to the reconditioners and ask for a warranty repair as the ball/ key has probably fallen out during assembly
SOURCE: 1991 chevy silverado lost reverse
just have someone look at it. like aamco or someone that does a free diagnostic. the tranny will probably have to be rebuilt.
SOURCE: 2005 chevy silverado won;t start.
i had the same problem, and it turned out the coil pack was moulding inside wich stopped the spark all together, i ended up changing my coil pack and putting on new wires because the ends connected to the coil were very corroded and that cures the not running part just fine
enjoy
SOURCE: 1990 chevy silverado stepside speedometer don't
speedometer is electronically driven usual cause is coil in spedo itself u would have to replace , pull panel and test voltage if power bad spedo, info on how to do chiltons book at most any parts store
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