Disc Brake Conversion

The speedway kit is “new” so you’re unlikely to find someone that’s used it.

That said, it looks exactly like a 73+ disk conversion. My guess would be that it’s an MBM or PirateJack kit. The only thing I don’t see is the tapered ball joint spacers. I wonder if they they had the 73+ spindles machined with the smaller ball joint taper? The description kind of implies something like that.

Really though if that’s the case you’re just doing a 73+ disk swap and paying for a non-stock looking brake booster you don’t need. Same for the adjustable prop valve. You can get a 73+ conversion from Dr.Diff for less than the speedway kit.

I’ve never been a fan of the SSBC set up. There’s no big advantage over the 73+ kit and you’re stuck buying their parts forever. At least with the 73+ Mopar swap you’re just using factory parts you can get anywhere. The SSBC kit has always struck me as OE type parts, but not Mopar parts. If you’re going to go aftermarket you might as well get better stuff to justify the hassle of buying all your parts from one company.