300D-5 speed from Germany

I am looking at a 85-300D 5 speed tranny with 210000 miles. She is asking $4,500. Is it a reasonable price? What do I expect to do (service vice) if I purchase it? The car overall is clean, have all service records. All new bushings had been done, some injectors, air condition unit was replace...Is there any differences between Germany car and American (Germany) car? Thanks in advance.