Hi and thanks for using 2CarPros.com.
I need some information. First, when the vehicle struggle up hills, were the rpm's raising but the vehicle speed was not? Also, was the check engine light staying on? Also, why is the vehicle not driveable at this point?
As far as it being difficult to shift, that is most likely the result of a bad clutch. Take a look through this link. It should be helpful in helping you diagnose the problem.
https://www.2carpros.com/articles/clutch-symptoms
In response to your other concerns, if a manual transmission is not abused and has been maintained, it should outlast the car. Also, the engines in these vehicles are proven reliable and are know to reach mileage much higher than you presently have. However, that is no guarantee that something else will not go bad. Also, I do not know the overall condition of the car, so it is really hard for me to say what may be next. I hope you understand.
By the way, based on your description, it does sound like the clutch is the issue and most likely not the transmission.
Let me know if it helps or if you have other questions.
Joe
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Friday, October 12th, 2018 AT 5:26 PM