Driveshaft balancing?
 

From 83-93mph my car gets wierd vibrations and I've had the wheels balanced three times and every time its pretty much the same. I was told to have my drive shaft balanced but have never heard of that before. This guy really knows his stuff though, so I can't imagine he made it up. If thats the problem, what should I expect to pay. Thanks.

I would probably look at getting your driveshaft balanced. What kind of gear are you running in your rearend?

I would have it balanced, but find a place that does a true High-speed balance, you want atleast 6K rpm balancing...

I'd expect to pay from $30-$100 depending on who does it.

Find a reputable shop, and find out what RPM they balance their shafts at, one of the local ones around here only does 3600rpm as their "high-speed" balance... I've had a LOT of troubles due to having this shopp do the balancing on my old driveshafts.