Q: Need Transmission Help on 1994 BMW 325i

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I just bought a 94 325i bmw and it would go in drive but not in reverse so I had the transmission filter change done on it and now it wont do anything, what is wrong?
(2) Answers
This sounds like the transmission has an internal failure, but it's really difficult to know until it is inspected by a repair shop. I would consider taking it back to where you bought it, this may have been a pre-existing condition, hopefully that is possible.
I had similar problem with My 2001 325i. Took it to the dealer and their estimate was $3000+ to open the transmission and diagnose the problem. I took it to another mechanic and he opened the transmission. It turned out to be a broken reverse gear caused by shifting the car to reverse while the car was still moving forward.
The mechanic found a used transmision and replaced it. Cost $2700.