Vn Shudders at high revs.

[King_berald]

when im on the freeway doing about 90-100 and i put it back into 3rd(auto) without changing the acceleration...the engine starts shuddering and vibrating the whole car but as soon as i put it back into 4th, it stops and drives smooth again.....anyone had this problem?

[Pub247]

Possibly be transmission mount. Does shudder under acceleration? from say 0-60?

[King_berald]

umm im not sure.....i think it does it at a certain rpm.......whatever it would be if i was in 3rd gear doing 90-100....do transmission mounts wear? or are they just a metal bracket?