I've had low speed vibration issues with the tranny in OD but it goes away at higher RPM. Since I don't want or need to drive 85 MPH I'd rather have the 350 back in it. After super tuning the engine some of the vibration has gone away but I'm still not happy. No vibration at all in direct drive. Hope yours works better with the 3:73. I've heard from a few guys that this is a common complaint with 700's but I fail to see why the General would build something like that.
Happy Thanksgiving.
