Originally Posted by rhhiii
I called my local driveshaft shop, Drive Line Service of Jacksonville, they said that GM didn't balance the shafts originally. They would balance the half shafts but it was only the weird corvette guys that wanted them balanced! LOL.
The process to balance the drive shaft uses heat + water and welding small weights and that will damage the paint or powder coating (in my case). I was told that I would have to repaint after the work was done.
What cross member brace are you referring too?
I believe the driveshaft was originally balanced from what everyone always says. I know mine has a weight welded/glued to it, which would suggest it was balanced.
I think you really need to research more on balancing the shaft. I've seen generic videos of driveshafts spinning on a balancer machine that has a lot of visible vibration to it before it was balanced.
They also say to mark at the differential side of the driveshaft so it goes back in the same way.
The "cross member" brace I'm referring to is the long aluminum brace that is bolted to the rear of the transmission and to the front of the differential. It also has the rubber hanged bolted to it that connects to the rear Y-pipe behind the catalytic converter.