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im trying to run a 4 gen front brake set up onto my third gen but the hubs are molded into the brake rotor. i have been looking for a few days and i can not find a replacement hub to change out the rotor hub assembly to a slip on rotor hub. any help would be appreciated thanks.
Yup, to the best of my knowledge, no such hubs are available "off the shelf". Somebody has to fab them up from what DOES exist. Which AFAIK is what BBU does (and others as well): they turn stock rotors down, to cut the rotor part off of the hub part. Although I'll let them speak to that themselves if I'm wrong.
Yes, Big Brake Upgrade modifies the factory rotors and spindles. But there are videos on youtube of people doing their own modifications.
Here's a picture of mine from BBU 5 years ago. The hub is a factory rotor with the "rotor" portion cut-off leaving the hub, as Sofa and QT mentioned, then the rotor for the upgrade slips on over that hub. The spindles are also factory, but with the stock caliper bracket chopped off, and a new bracket for the upgraded caliper is bolted onto the modified spindle. The brackets attached to mine are for C6 brakes. The 4thgen brakes require a different bracket, but it's the same principle.
If you're not in a rush and can wait a few months, BBU is currently working on the manufacture of an all-new spindle design that will bring 3rdgen front brake upgrades into the 21st century. It isn't ready yet, but it sounds like it's progressing nicely. Verse in 3D modeling ? - Third Generation F-Body Message Boards
04-29-2023, 04:38 AM
Although I'll let them speak to that themselves if I'm wrong. 
