chewy said

I went through this same conundrum with my dart as well. Having a almost all original, begs the question, what do I do with it when the spiders in the 7-1/4 break... had originally thought a 7-1/4 suregrip carrier was my answer. Till it came to finding/affording one. Then finding parts to rebuild it if need be after that, is also a huge issue.

Though I've never seen full documentation that it was done to a 273-4bbl dart, supposedly you could order add-ons from the 65 performance catalog, which included an 8-3/4. I've heard of barracuda that have the option from 65. Don't see axle differences noted in the build docs that I have for the dart.
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It's all besides the point. When it breaks, you have a broken rearend... no drive, no fun...

When mine broke, had already picked up a 8-3/4 housing and a few different pigs by then. 2.76, 2.93, 3.23 and 3.55 l for when it eventually happened. Sold the 4.10s and 3.91s that I had picked up a couple years before that.

The price of 8-3/4 housings has tripled since 2010, but can still find them for less that $1000. See one in for sale section with axles for less than $800 right now. Sure grip centers run a bit more than $500 used. New/rebuilt for much more.

If I had to make the switch over again, I'd do it with today's prices, and complain a bit, but figure the way forward to make it move again.

Just my $0.02. Hope it helps.

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