Hi and thank you for using 2CaPros
This is likely 1 of 2 things.
1. Your third gear clutch pack is worn out. If you can't get third you wont get fourth. This is very likely given the mileage. The fix is a transmission overhaul.
2. Your third gear shift solenoid has failed. And again, no third then no fourth.
A transmission shop can test and confirm either one.
If you have anymore questions please ask. If you do take it to a shop let us know what they say.
Thank you, Rich
Tuesday, August 13th, 2019 AT 10:15 PM