Weird noise vp wagon rear.

[vp93qman]

Hi everyone Im new to the site. Its a vp wagon auto when driving around 100k's it has a strange
vibration in the rear under light power if I drop it back to 3rd it goes away as soon as it drops back into 4th its back Iv had a look at the tail shaft and the exhaust but they seem fine. maybe a stuffed uni? any feed back would help thanks.

[Pub247]

Possibilities include uni joints, centre bearing, velocity joint oand gearbox mount. Take it to a tailshaft specialists get them to look at it most likely its the tailshaft but replacing gearbox mount is cheap and effective. Tailshaft runs into about $400 for a full rebuild and balance