Hi, I've got a car that sounds similar to this, except that the howling (like a gail) is most pronounced under light throttle conditions and at all road speeds.
The vibration I get starts at the exact moment the car changes into overdrive top (54mph in my case, and basically its a direct drive 5th gear with out the torque converter to give better mpg). This gear change is difficult to detect as it happens at such low revs (around
2000rpm). As you say the vibration is bad at first but as speed rises fades a bit.I also haven't had my car long, but did get it up on axle stands a couple of weeks ago to find there was oil leaking out the diff and that I could replicate the howl, running the car in D and revving the engine, ab-it momentaraly.
I also intend to change the diff bearings as soon as the engine is back together!
Whilst under the car (not running) I grabbed on the the rear of the gear box and was able to move it up and down quite a distance (about
3/4in in both directions), I'm aware that there is a spring in this system but wonder if at high torque low rev conditions that excess movement here could bring about a vibration? I can feel it through the steering a little which suggests to me that a large mass is moving around inside the confines of the engine/transmission bay?Any thoughts anyone on what I've said or our problems?
Much appreciated
Mr Smooth