Having some brake issues in my 65 GS and came across this link for a F body rear disc conversion Any one attempted this? Will this fit in 15x7 wheel? thanks https://www.hotrod.com/articles/ccrp-1204-budget-gm-rear-disc-brakes-swap-junkyard-builder/
You can also used the set-up from a rear disc S-10/S-15/ baby Blazer (and their corporate brothers). You most likely will have to have the axle centers cut down to fit the rotor center.
I just started looking into this swap & unless you get the backing plates. calipers & rotors for pennies on the dollar you're better off buying one of the Right Stuff kits. I started to add up replacing the rotors, pads & calipers once I sourced the backing plates, caliper cores & rotors used, once added up it's actually a little less to buy the kit unless you find a set up with perfect calipers that you don't need to replace with remans. Not sure that I'd be willing to install used brake parts without replacing or at least rebuilding the calipers, replacing the friction & at the very least turning the rotors but considering how little metal they typically have they'd probably need replacement. Ebay has a couple of sellers with the used GM parts for about $150, might be worth trying to find something local but not sure how much you'd save.
I did the right stuff swap on my 70 Stage 1. This kit is based on the second-gen F-body rear disc setup with 11" rotors and it rubbed the stock 15x7 Buick chrome wheel. If you find one in a yard, take a spare Buick wheel with you and see if it will rotate once installed on the axle before you bring it home. 11.5" seems a touch big for a factory wheel after what I went through on the 11" swap. My 71 350 car is next to get rear discs. I'm planning to use one of the kits sold by Scarebird. They have a 14" wheel kit that is similar to the Right Stuff kit I have now. The other is similar to the third-gen F-body kit first posted. With either kit, I would suggest longer lug bolts as the rotor is thicker than the drum and I wasn't happy with the thread engagement with short studs.
What ever you do, don't do the rear kit that uses the Eldorado rear calipers with the pistons that spin out for the E brake. use something with the small drum e brake set up inside the rotor hat. I don't have enough time to tell you everything that sucks a bout the Eldo style.
They aren't that bad. They work well if you use the emergency brake often enough to keep it moving. Most all the horror stories I hear are from not using it. I've had mine for more than 5 years now and it has worked without issues other than the previously mentioned need for longer studs, which all disc conversions would need.
Here's the Scarebird link to the one I'm going to put on the 71 4 speed car. It uses an S10 rotor and a Citation caliper. https://scarebird.com/index.php?route=product/product&path=59&product_id=182
Sorry I forgot to mention I have a 65 chevelle rear as I’m running 3.73 gears. Guessing that would change the kits?
If you don't have bolt-in axles, you will have to remove the cover and drop the C-clips to get the axles out. Other than that I'm pretty sure most things are going to be nearly identical.
