will an unbalanced drive shaft kill the trans after like 500 miles?...this is the 3rd trans that has had he bearings go in like 3 months...they are all fine for about 500 miles...and they all sound/feel the same as they go.....i was thinking that maybe its the drive shaft. i put the right oil in it and the right amount...no leaks...clutch is good and so is throw out bearing....if you can think of anything else it would be appriciated.


car: 93 240