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Old 02-25-2019, 05:42 AM   #16
colt
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Quote:
Originally Posted by rhhiii View Post
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.

Colt,

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.
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Old 02-25-2019, 08:55 AM   #17
rhhiii
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Balancing

I should have provided more details in my first reply. The half shafts are not balanced from the factory. A drive shaft shop will take your money if you want them balanced.



The drive shaft is absolutely balanced from the factory and I will be taking mine up to the shop next week for balancing.



When I replaced the u-joints on the half shafts I could find no discernible difference between differential vs wheel bearing end. Why does everyone say to mark the ends so you don't mix them?
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Old 02-25-2019, 08:56 AM   #18
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Cross member

Colt,

What cross member brace are you referring too?
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Old 02-25-2019, 10:54 PM   #19
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Quote:
Originally Posted by rhhiii View Post
Colt,

What cross member brace are you referring too?
It's the large heavy aluminum beam that bolts to the transmission and to the rear differential. You can't miss it.
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Old 02-28-2019, 06:49 PM   #20
rhhiii
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I don’t have an aluminum cross member like that on my 76. It’s an automatic if that makes a difference.
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