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Here is an interesting question. Has anyone ever seen or had a 9inch Ford rear end in a Corvette with the same suspension/axel setup as the stock has. I mean my dad has a 9inch in his '64, but he completely redid the suspension for drag racing and it has the same straight axel. The iron casing of a 9inch should weld right up to the frame with ease, but how to get axels that would work? We all know 9inches are stronger than 10 or 12 bolts, especially the nodular, plus cheaper and easier to work with. Of course I would never bother, but my dad loves doing this stuff and I'd like to tell him some of your ideas on the subject.
What's the fun in that!?!? Fabrication is the key :) I'll show my dad the site, but they don't say much about it's design that I noticed. He would rather build it himself than buy it, not that he couldn't afford it :) I suppose it would be something like getting the right spline axels into the differential and welding the U-joins in place and hooking it up to the stock suspension.
IMHO, seems like a waste of time & $$$, especially considering the weakness of any IRS is more about the axle stubs/splines and the half shafts/U-joints not the differential. HD versions of those are readily available (i.e. Tom's).
I've been throwing this idea around for a few years now and I think it's definitely worth the center section 9" swap just for the ability to swap gears ratio's out in less than an hr. Hell, I've done it on the side of the road in less than 20mins with a friend. But it would only be worth it if you took advantage of it, if you only want to run one gear ratio (and yes I understand I'm in the minority by wanting the flexibility) then the Toms stuff is really tough to beat.
I sure would like to see one setup with the 9" center section, pretty cool.