Thinking about this ---- since the same issue was there - but got worse with the changes:
Major change was the improved bushings -- maybe stiffening the rear end as an assembly..... so just talking out loud now.... the pinion CLIMBS with force applied... maybe it used to (before new bushings) climb enough at speed to partly correct an out of angle driveshaft thus REDUCING the vibration (driveshaft working angles) and now it can't climb as much as it used to so is holding back and making the working angles out enough that it's increasing the vibration?
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