Need Help Figuring Out Cause Of Vibration

[napoleon1072]

Car got a new transmission and then I got it back it vibrates around certain speeds 30-45 almost on a regular basis, took it back to trans shop they said it wasn't the trans the front end needed work and it was causing the vibrations. Took it to my Mechanic and he said that the front end is tight no problems (Had him replace tie rods, bushings ect. before new trans) so I was surprised when the trans guys said that. So while my mechanic was checking it out I had him balance the tires and such just in case. Well to sum it all up the car still vibrates, is this transmission related?? or could it be some other issue? Any input would be appreciated.


P.S. I have 1 month left on my transmission warranty

 

[William]

I had a similiar problem with my 88 Crown vic. Turned out it was the drive shaft
Apparently the previous owner had the transmission replaced and the original drive shaft wasn't re installed. So I brought it to a family mechanic who somehow trimed the replacment shaft to fit. Not sure if this is your problem, but definatly worth looking into..