1- You have to check the transmission oil level.
(Engine running in the park or neutral. )
2- Retrieve transmission trouble code with a scanner.
3- Depends on what code you have
4- Find out if your problem is electrical or mechanical or hydraulic.
5- It could be the 3-4 solenoid, 3-4 shift valve stuck inside valve body..........and so on.
6- At the cluster display the PRNDL display all lights state = on. If not the PRNDL switch on the side of transmission water intrusion.
I believe you need a good Technician if you don't find it.
There are so many things.
Hope it helps.
SOURCE: Gear shifting problem
The 1st thing to do is have a test run on the transmission control module to see if any trouble codes are present, next have you ever serviced the transmission, fluid and filter change, should be done at 60,000 miles, on occasion this can cure problems like yours.
SOURCE: 97 chevy tahoe wont shift
The transmission is probably a 4L60E or 4L65E the third and forth clutches and steel are probably burnt out or the clutch piston has blown it's seals very common on those transmissions.
SOURCE: I have a manual transmisson
The only way in a manual transmission to not be able to shift into some gears but not others is that the syncronisers are bent inside the transmission.
SOURCE: 2002 chevy avalanche wont shift out of first gear
Ther is a sensor on the rear end. Take kit out and clean it. This should solve your problem. Located on top of the bell housing
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