Hi clutch dust, I have this same rumble coming through the seats when accelerating, so you're driveshaft change solved the problem which has saved me a lot of finding so thank you, could you tell me how much 2 driveshafts cost, much appreciated,
Front drive shafts do cause vibration under acceleration. But so can the support bearings in the IRD or gearbox.
Don't bother with cheap drive shafts as they vibrate again very quickly. Buy OE and you should solve the problem, as long as the support bearings in the box and IRD are ok.