Wierd vibration...

[StuntmanMike]

I've had this problem for a while, but it doesn't come up that often. But I guess I should figure out what it is.

If I'm driving down the highway in OD at SAY 60 or 65, below 2k rpm (2.73 gears), the car is nice and smooth.

But if I take it out of OD so the rpm's rise, I get this bad driveline vibration. It also does it if I floor it at highway speed, to go from say 60-90mph, as I go through 70's into 80's, I can feel it again.

When driving non-aggressively, I never feel it.

Any idea what it could be?

[juiced99ws6]

could be your tranny mount. could also be crossmember bolts coming loose. I would start with checking those things. Just replace your mount it is only about 20$ and you can check the other bolts all at once.