1994 Plym Voyager - vibration problem since removing trans

1994 Plymouth Voyager
3.0 V6
3 Speed Automatic

I had a problem with transmission fluid leaking from the bell housing so I dropped the tranny to replace the front pump seal. After getting everything back together, I started to notice a vibration or rumbling type noise from the front end. The noise completely goes away when taking left turns, as the wieght shifts. I started looking at various things, ball joints, whell bearing etc. I noticed that one of the boots on the drivers side CV shaft was blown out and leaking grease so I replaced it. There was no change in the noise. I figured why not replace the passengers side as well. Once I did that, that noise changed. Now instead of making noise while driving and going away in a left turn, it is quiet driving straight and makes noise when turning right. Needless to say I had to drop the tranny 2 more times because it was still leaking. Now I am back to the original noise of it vibrating when driving straight and it gets quiet when turning left. I have read in various places that the motor needs to be centered in the engine compartment by measuring the length of the CV shafts. They appear to be fine but the problem persists. Is there some easier way to align the motor and tranny?