trans problem

[xekushnr]

ok, im looking to FINALLY buy my 240. ive found a car, its an '89 with a slighty dinged exterior but an interior that looks like new. according to the description, the person tried towing the car without disconnecting the driveshaft and now when the car is put in any gear it just drives forward. they are asking $650. i was in my autos class in high school for all 4 years and i know i can fix anything related to the engine, but the problem is that i dont know close to as much about the whole driveline. since i wont see the car until next week i wont be able to diagnose the problem. does anybody know which part(s) may need to be replaced? heres that part of the actual listing just in case i missed something:

This 1989 240sx was a nice car. Until I made the mistake of towing it with a car dolly and did not disconect the drive shaft and this stupid move did something to the trans. The car after this when started every spot on the shifter it would be in a forward gear. How bad the damage is I do not know. because I just hauled it back and it has been sitting ever since.

[CiPHeR_Tx]

heh....new internals in the transmission, or a new one...i'd go with a new transmission...look around in junkyards for low mileage ones