What is wrong with a 95 Chevy truck when speedometer and tach doesnt work and transmission wont shift but some times it does?

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The VSS (Vehicle Speed Sensor) is probably bad. Also check the fuses.
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What could be wrong if the speedometer stopped working and the transmission will not shift?

It sounds like the VSS (Vehicle Speed Sensor) has failed. If the VSS fails, it can cause the symptoms you are describing. Check the wiring and make sure your VSS is properly p

What could be wrong if a 1995 Ford Escort LX speedometer does not work and the automatic transmission will not shift out of first gear?

I'm having the same problem. Seems to me it's something in the engine wiring harness. It happened once and my daughter played with some of the wiring and it was fixed for quit
In Ford F-250

Why transmission wont shift speedometer doesnt work ford aerostar1996 3 liter v6?

Hopefully the simple solution would be the fuse 15a for the speedometer. If the computer doesn't read the speed, the tranny doesn't know when to shift. If the fuse is alright,