What would be wrong if Transmission will not shift into passing gear 92 oldsmoblie 88?

Find a local auto electrician. A professional grade scan tool computer can check for trouble codes and also check transmission solenoid operation.

https://www.google.com/search?q=auto+electrician+near+me

https://www.google.com/search?q=92+Saab+900s+automatic+transmission+will+not+shift+into+gear

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The shift point are set wrong or else the trans is getting the signal to shift late. Not sure what trans we are talking about but check and make sure the vacuum line in not bad or else a switch is bad on the trans that tells it when to shift.

There are many causes for this symptom.
Main suspects include:
worn out transmission
old fluid needs changed
valve body is dirty or clogged transmission filter
worn transmission or engine mounts
wrong transmission fluid added at top-up
shift solenoid broken

i had the same problame in my 1989 ranger xlt 4x4 i speed shifted a trans that wasent ment to and my trans got stuck in second and wouldent come out had to take it somewhere to get the forks in the trans replaced turns out i bent the forks and it wouldent come out of second

what size motor is in your car? Generally speaking, on the 70's and 80's v-8's, Oldsmoblie and Chevy are underneith on the passenger side where the motor bolts to the transmission, Buick and Pontiac's are on the drivers side

my guess is its not electric shifted, (what trans model is it)
so step 2 in the FSM book says.... and i paraphrase
step1 is stall test (my guess passes in 1st and reverse)
step 2, line pressure test?
if that fails, tranny is bad.

Check the modulator and the vacuum line to it.

Hi:

Your transmission has 3 shift rails...
1st - 2nd
3rd -4th
5th- Reverse

If your 3rd gear doesn't work , you have an internal transmission problem, such as a syncronizer, or similar fail... There is not much you can fix, without removeing the transmission.

it sounds like you ground the spacers between the gears. have a look under the gear shift. pull the gear shift off then look at the transmission spacers. you will see where the gear shift sits see if some spacers look like the rest.

need more info i had a 1984 chevy half ton and first, second, and third worked fine but lock up didnt work. the problem was there was no vacum at a switch under the hood on the fire wall also your shift linkage could be out of adjustment. try driving down the road and raise up a little on the shifter.