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Re: fuse of speedometer etc.
Could be a short that doesn't touch until the "jerky" motion of shifting gears. Maybe a wire is resting near metal and everytime there is a motion it touches the metal and blows your fuse.
I would check continuity with ta voltmeter from your instument panel to the fuse box. and that will tell you if the line has a short anywhere between the two.
Any good 12v car audio mech can do this quicker and cheaper than a dealer.
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No the problem is the cluster computer is defective, remove it from the truck and have it rebuilt by a local GM cluster repair shop, turn around is about 1 week so plan on not having use of the vehicle.
You probably have a blown fuse that conrols the speedometer and shift point of the transmission; Check the fuses inside the car under the dash on the driver side. The speedometer tells the transmission when to shift.
problems yes low high and high low are usually caused by faulty defective clutch coil or defective thermostat...electrical issues can be cycling switch pressure switches ambient air sensor or fin switch ( evap temp sensor)
Mechanically it could be clutch,or compressor the symptoms are not good... srry hit me back if you got some manual gauges and wanna run pressure test diagnostics..
I am assuming the fuse was not an issue before replacing the starter. You probably pinched a wire with the starter when you installed it. Take the starter back out and inspect the wiring harness, also see if the fuse blows when the starter is removed.