To replace factory drums on a 70 Challenger

11.75 rotors on 73-76 A body spindles....

Could try these if you want a kit but they are kind of expensive www.mpbrakes.com or www.ssbrakes.com

The factory 11.75 setup is better than what MP or SSBC sells. For some reason those aftermarket guys never figured out that 11.75 rotors are better than 11 inch rotors.

If you're willing to run larger rims then you can step up to even larger brakes but the costs go up significantly. The factory 11.75 setup is adequate for most any daily driver and is very cheap to install. The last swap meet I was at there were several vendors with disk brake knuckles for sale.

I did the 11.75 swap on my 71 Scamp using 73-76 A-body spindles. I used all new NAPA stuff, including non-Chinese rotors, got an E-berg aluminum MC, a Magnum HP adapter and heat shield, and a boneyard prop valve from a 73-76 A-body, boneyard slider caliper adapters from a 78 Cordoba. Cost me about $700 total, and the car stopped on a dime.

Looking for spindles, shields and caliper brackets?

I have A and FMJ spindle, shields and caliper brackets. I believe I have a both sets of small and large disc brackets.

Steve is pretty spot on regarding prices of the hard parts you'll need.

I'll be installing Willwoods on the Dart this weekend. Just finished "pre-assembly" rotors hats safety wire etc. I'll post a report when done.

Disc brake kits

I think hands down the factory 11 3/4 upgrade wins,Ive done it many times and the stopping power is very impressive.When I was younger and poorer I have even gone to pick-your -part, and picked up every single part used for under $100.here is a link to the article explaining the swap and parts list you need.

http://www.moparaction.com/tech/archive/disc-main.html

The $399 price is fair for those parts but the point I made earlier is still valid. For some reason, none of these brake kit vendors seem to understand that the 11.75 kit is better and that it fits with stock 15 inch rims. I don't see any reason to bolt on the wimpy rotors when the 11.75 rotors are better and not anymore expensive.

Switching from 4 whl drum brakes to disc / drum has been a very popular upgrade for years. IMO, the mod is way over-blown. The original and main reason for the mod was brake fade with multiple brake applications - mainly due to poor quality brake shoes. The issue of poor quality brake shoes has been addressed long ago, and unless you are doing some major towing or sports car type racing, you will never realize the expenditure. Take a 1/4 of the $ and upgrade your existing brake system with some quality semi or full metalic shoes and new drums and you will have all the braking you will ever need. Take the rest of the $ and put it in the motor, or some area that you can actually enjoy.

How about the Summit kits, are they junk?

Who is making the semi metelic shoes?