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Stock trans mount/height??solid/poly mount??
Maybe the rear axle housing bent.any problems sliding the axles in/out?? axles go in great
Posible bent spring/making thrust angle off.rear wheels pointing more 1 way then the other.(dog tracking) not sure
Do you buzz the engine to the same rpm in 1st and 2nd?? yes and no vibes
Switching to 3.23 gears made the vibration come at a higher mph,Then It has to be rpm related
A shot in the dark.the fan??? electric
A cracked flywheel will usually make some noises
tailshaft bushings ok?? new tailshaft,housing and bushing
Vibrations can travel.What if the vibration is up front of the shaft,but the rear u-joints go bad because there is no room to move/ more tightly held together.
Have you had it on jackstand,and whatched the driveshaft,should be pretty smooth,any osilation.
just thinking outloud.

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