Transmission slips out of 5th gear wat do i do to fix it

There could only be a couple possibilities for this to happen. First, with standard shift transmissions the shifter linkage could be worn being that it only happens with 3rd and 5th gears, as this shifter slide works for both of these gears. If this is the case it is only a matter of visually inspecting the linkage for worn or broken parts and replacing them or adjusting the linkage which is the inexpensive fix that I hope you are looking at. Second, This could be caused by the syncronizers within the transmission are going bad/worn or broken. In either case the transmission will need to be removed and repaired or replaced which is the expensive route that I pray is not the way you have to go! I hope that this is some help.

If 4th gear is good, no slipping, then your transmisson is toast. Replace with a known good working one.

Bands inside the transmission expands when they get warm Which can cause this issue. If your have stretched bands you will need to either replace them at a shop or new transmission. Or if you have a warranty of some sort.

You need a new clutch. A 5 speed is a gear box , they dont slip like an automatic can.

A synchronizer for 5th gear is bad,needs to be replaced,the transmission needs to be removed ,and repaired.

The clutch is slipping, eventually it will fail completely. The reason she notices it in 5th gear is because 5th or overdrive uses the transmission the most IE low rpms high speeds. Soon it will affect all gears. Sorry the only way to fix it ts to replace it.
I think they make a clutch kit for this model
Good luck
Hope this helps
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You're 5th gear syncro has just gone out. It keeps your shift forks and slider gear from popping off. It also makes it possible to shift the gear in. It's going to take a rebuild of the transmission to fix this problem.

change trans fluid and filter

Have you checked your transmission fluid level and your transmission filter? That's a common cause of slippping.

The 5r55w transmisson is known for wearing out the case where the front and middle band servo pins go thru. If it wore the front band servo, it would slip in 2nd. But if it slips in 1st and 2nd it sounds like it could be a weak forward clutch. How many miles does it have on it. If you can get it up into the higher gears, does it slip in 5th. 2nd and 5th use the same band to apply them. Are you gettting and overdrive off light flashing? IF yes, what codes?