I drive a well-maintained 2002 Impreza WRX STi w/ 145,000 miles and no mods (other than paint job). At about 140,000 I noticed that the car would start "knocking" whenever the car had been driven for more than 30 minutes and I made turns to the left or right. After getting the CV axels replaced at 141,000 miles, I noticed that the issue remained (what a waste). Around 143,000 I took the car into two mechanics who told me that the car was definitely drivable, but that the transfer case (which I was later told Subaru doesn't have) was going out and would need replacing.
Over the last 250 miles, the car has decreased in power by about 90%. Though the engine revs well, if the car is on any kind of incline, it will not go. And if the car is on a flat drive, it takes a good 10-15 seconds to get up to 30mph.
I've been told that either I have to spend the cost of the value of the car (~$4500) to get a new transmission or that I need to find a salvage yard that has my car model and swap out parts (which would still run upwards of $1000-1500.
I wanted to reach out to you to see if you had any previous experience, thoughts, or advice.