Check the bracket where your throttle cable is connected to the engine. There should be 2 cables. One of them is the throttle cable, the other is what I call the "kickdown cable" which tells your shift computer when you punch it and tells it to down shift. It can also affect the shifting ability. It is possible that cable has come off or so loose its not functioning properly. Of course it is also possible that your bands are ate up and you no longer have overdrive anymore. Try manually shifting from drive to overdrive see if that helps.
SOURCE: 1996 3500 TRUCK WON'T SHIFT OUT OF SECOND INTO 3RD OR OVERDRIVE
Their are a few possible causes of this. One their is not enough tranny fluid in it or the kick down cable is not hooked up properly. the kick down cable also runs the vacume to the transmission.
Check theese and give me feed back to further assist you.
Thanks, Charlie
SOURCE: 2003 chevy silverado will not shift into drive or overdrive.
transmission shift solenoid is stuck open this is a common vehicle issue in automatics and not particular to any make or model vehicle 15 dollar part and arm and leg for labor if taken in
heres an idea to try
take out the transmission filter and replace with new one make sure to take not of any metal debry in trans pan this indicates the trans had sheered its gears down and a trans rebuild is needed
the transfilter needs to be changed at a certain milage interval they can get clogged up
there is a kit you buy for your truck at any parts store
its an easy change hour of time unbolt trans pan unbolt trans filter and put new one in
kit comes with new seals less than an hour you can do it yourself
to overdrive you would feel a difference in shift badley if it was that something to keep in mind
SOURCE: I have an 80 series
It seems like your "2nd start" button is turned on. The 80 series LC has a button next to the shifter which allows it to start in 2nd gear. If the button is not engaged then there could be a problem with the circuit, but that is not common
SOURCE: TRANSMISSION
sounds like either a bad speed sensor or controller. shift points are too high, should be at 2000 or slightly less. if fluid is good and clean and shifts do not flair, check those control units. Not sure about calibrate...could mean out of calibration...Id ask
another tech about that. (i don't know everything!)
SOURCE: 2000 grand prix w/auto transmission wont shift into overdrive
some of the trannys has straps in them that sometimes needs to be tightened and that could be the cause of it
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