The gear is probably worn. About the only thing you can do is either rebuild the transmission or get a replacment.
the synchronize in the transmission is bad, that why the jumping out of fifth gear
To replace the fifth gear on a 1992 Mitsubishi Stealth, you’ll need to remove the transmission from the vehicle. Once the transmission is out, disassemble it to access the gear set. Replace the worn fifth gear with a new one, ensuring proper alignment and secure assembly. Finally, reassemble the transmission, reinstall it into the vehicle, and check for proper operation before driving.
I have an 86 and it is. If first gear is not really low, it probably is.
My 1995 Metro jumps out of fifth gear when the gear is worn out. I had the transmission rebuilt, and fifth gear replaced, at 150k miles and fifth gear replaced again at 220k miles. The transmission shop that did the second repair told me that fifth gear is located outside the main part of the housing and is not lubricated by direct contact with the transmission oil. Instead the oil is pumped by the action of the shaft into a channel and spout system that pours oil on the gear. Part of this system is plastic and prone to damage. Even when working perfectly, the system tends to under lubricate fifth gear, in their mechanic's opinion. On the plus side, it is not necessary to remove the transmission to get at fifth gear, they can just remove a housing to inspect and replace it. On the down side, it still costs hundreds of dollars if it has to be replaced. I had a general mechanic perform the rebuild and the transmission specialist speculated that he probably was not familiar with all the components of the lubrication system for fifth gear and didn't replace it properly. They could not even find one piece that was essential when they did the second repair. I recommend taking it to a transmission specialist that has worked on metros.
Bad synchronizer. Internal transmission repair required to fix.
get a new transmission or rebuild yours
transmission problem
the shift siliniod for AOD transmission is bad. it cost about 30 bucks and is usually special order
Torque convertor could be defective siezed up.
There can be many reason that will prevent a transmission from shifting into a particular gear. The most common reason is the transmission gear is worn smooth.
The grinding noise can be an indication of a bad gear in the transmission. The grinding noise can also indicate a problem with the clutch.
1988 accord will not go into 5 gear