[bigred90gt]

Between 50 and 70 mph, I get a pretty bad vibration in the car through the stick. Below 50mph and above 70 mph, it drives like a dream. Also, when I hit about 85mph, I get a nasty rattle that I can feel in the stick and hear. It sounds like the tranny is about to fall apart. When I decelerate, it stops rattling at about 70mph.
It doesn't matter if I put it into neutral to coast down, or if I ride the gears down. Any ideas or corrective suggestions would be greatly apreciated. Every time I hit about 85mph, it sounds like the something is about fo fall out. Thanks in advance for the help.
Caymon