Thanks fellows, great information.

I need to do some asking around but the Twin Traction carriers should be a standard Dana/Spicer Power loc.
It is still a highly regarded unit, GM basically copied it for the fabled 55-64 Olds/Pontiac rear ends.
The only major change is more axle splines, the more, the better. (to a point)
Guessing that Craig would be an expert on these??

Despite searching, I don't know much about what fails...
The 9 3/4 ring gear is strong enough to support a blown Hemi.

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You guys are thinking too hard!
I'm talking about switching out whole assemblies, not parts.
Why would I want to? Ease of maintaining a Dana.

"The 55 unit is a more robust unit including axles. You would gain TwinTraction by switching, but are you going to drive your car in the snow and mud?? I agree with BH - service the punkin"

Snow & mud? How about a burn-out pit. Gotta warm the slicks somehow!

Wondering how big a deal it would be to replace a '55 rear axle with a '56 unit. It's the whole assembly I am wondering about.
Thanks!

Most of the coups that I have looked at have broken door glass.
What is the cost to replace? Would I need to have glass made to avoid old, delaminated glass?
Also wondering about windshields. Any new ones left out there?
What is an average going price.
Thanks!

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Hey 39six, If ya can't say anything nice...

2 pages in the first day!
I LOVE you guys!