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Upgrading 73 `Cuda style disc brakes #1691798 10/28/14 10:08 PM 10/28/14 10:08 PM
Joined: Jan 2003 Posts: 8,131 New Mexico UCUDANT OP Troll Hunter
UCUDANT OP Troll Hunter Joined: Jan 2003 Posts: 8,131 New Mexico	I will be swapping an E body from front drums to 73 Cuda disc brakes and want to upgrade the system some. It's for a 500hp small block street car I'm thinking a minimum of drilled and slotted rotors. Would it be worth using reproduction caliper adapters for the larger C body discs?

Re: Upgrading 73 `Cuda style disc brakes [Re: UCUDANT] #1691799 10/28/14 10:19 PM 10/28/14 10:19 PM
Joined: Jun 2007 Posts: 2,432 NorCal RylisPro top fuel
RylisPro top fuel Joined: Jun 2007 Posts: 2,432 NorCal	I would recommend any of Dr. Diff's kits and installing an adjustable proportioning valve. I would highly advise against drilled rotors though, you will not need them for track use. Here is a 13" rotor that Cass sells which recently showed up Thanks Cass! 73 `Cuda Instagram: @rylispro YouTube: RylisPro www.rylispro.com 925-214-9192

Re: Upgrading 73 `Cuda style disc brakes [Re: UCUDANT] #1691800 10/28/14 10:42 PM 10/28/14 10:42 PM
Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada R RUNCHARGER I Live Here
RUNCHARGER I Live Here R Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada	If you're going to change rotors anyway I would upgrade to the C-body rotors for sure. Sheldon 8314803-ChallengerBuild016.JPG (182 downloads)

Re: Upgrading 73 `Cuda style disc brakes [Re: RylisPro] #1691801 10/28/14 10:59 PM 10/28/14 10:59 PM
Joined: Jun 2007 Posts: 2,432 NorCal RylisPro top fuel
RylisPro top fuel Joined: Jun 2007 Posts: 2,432 NorCal	Another tip is to pay attention to the direction of the internal vanes the rotors have and to ignore the direction of the slots I checked the one installed on my car and they go straight up and down while this new rotor I have is effectively a driver side rotor 73 `Cuda Instagram: @rylispro YouTube: RylisPro www.rylispro.com 925-214-9192

Re: Upgrading 73 `Cuda style disc brakes [Re: RUNCHARGER] #1691802 10/29/14 09:41 AM 10/29/14 09:41 AM
Joined: Jan 2003 Posts: 3,575 The Netherlands BigBlockMopar master
BigBlockMopar master Joined: Jan 2003 Posts: 3,575 The Netherlands	I've got 11.75" / 1.25" thick '73 Chrysler rotors on my '73 Dart. Shimmed the original adapter with a simple washer to the correct caliper alignment and made a colar for the spindle to be able to use the stock '73 C-body outer bearing. Quote: If you're going to change rotors anyway I would upgrade to the C-body rotors for sure. Sheldon Are those C-body rotors in your pic? They don't look any thicker than 1" to me. BigBlockMopar.com

Re: Upgrading 73 `Cuda style disc brakes [Re: BigBlockMopar] #1691803 10/29/14 11:25 PM 10/29/14 11:25 PM
Joined: Mar 2014 Posts: 40 upper So. CA N ntsqd member
ntsqd member N Joined: Mar 2014 Posts: 40 upper So. CA	Rotor thickness is really just a rough idea of how well it will radiate heat with lots of other factors involved. Rotor diameter is where better stopping power comes from. Bigger OD = more brake torque from the same hydraulics. I used to swerve around my hallucinations, now I drive right thru them.

Re: Upgrading 73 `Cuda style disc brakes [Re: BigBlockMopar] #1691804 10/29/14 11:29 PM 10/29/14 11:29 PM
Joined: May 2003 Posts: 96,655 On The Boat, On The Lake, Wa. ... amxautox Still Retired. Still Posting on Moparts. A Lot.
amxautox Still Retired. Still Posting on Moparts. A Lot. Joined: May 2003 Posts: 96,655 On The Boat, On The Lake, Wa. ...	Quote: Are those C-body rotors in your pic? They don't look any thicker than 1" to me. You think those are only 1" thick? The studs are 1/2" dia, compare those to the thickness. Sure looks like 1 1/4" thick rotor to me. Tom "Everyone should believe in something; I believe I'll go fishing." -Henry David Thoreau Men and fish are alike. They both get into trouble when they open their mouths author unknown

Re: Upgrading 73 `Cuda style disc brakes [Re: amxautox] #1691805 10/30/14 12:17 AM 10/30/14 12:17 AM
Joined: Jan 2003 Posts: 8,131 New Mexico UCUDANT OP Troll Hunter
UCUDANT OP Troll Hunter Joined: Jan 2003 Posts: 8,131 New Mexico	After reading the above responses I started cross referencing wheel bearing PN's and it does appear the outer bearing is different. What is the best solution for the wheel bearing to adapt the 73 E body spindle and the C body (73 and up?) rotor?Thanks for you input. I'm already cleaning and prepping parts THANKS

Re: Upgrading 73 `Cuda style disc brakes [Re: UCUDANT] #1691806 10/30/14 01:58 PM 10/30/14 01:58 PM
Joined: Jan 2003 Posts: 31,002 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,002 Oregon	There isn't really a clean way to hang a C body rotor on an E body spindle. You have to use spacers and hope they don't spin. I looked into having Timkin produce a conversion bearing but the cost was way too high for me to front.

Re: Upgrading 73 `Cuda style disc brakes [Re: AndyF] #1691807 10/30/14 02:51 PM 10/30/14 02:51 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	I make outer bearing adapters for mounting '73 and newer C-body rotors on '73 and newer A/B/E/F/M/J/R body knuckles. They are no more likely to spin than the bearing itself. You could also use '69-'72 C-body rotors, bearings and seals. These fit '72 and earlier B/E body knuckles out of the box. If you install an A13 inner bearing and race, the earlier C-body rotors will fit '73 and newer A/B/E/F/M/J/R body knuckles without an adapter. I never looked into a seal for that combination, however. Contact info

Re: Upgrading 73 `Cuda style disc brakes [Re: DoctorDiff] #1691808 10/30/14 09:32 PM 10/30/14 09:32 PM
Joined: Jan 2003 Posts: 8,131 New Mexico UCUDANT OP Troll Hunter
UCUDANT OP Troll Hunter Joined: Jan 2003 Posts: 8,131 New Mexico	Quote: If you install an A13 inner bearing and race, the earlier C-body rotors will fit '73 and newer A/B/E/F/M/J/R body knuckles without an adapter. I never looked into a seal for that combination, however. Are they the 2 piece rotor/hub? So the earlier C body outer bearing is the same as the 73 and up E body but it's inner is different?

Re: Upgrading 73 `Cuda style disc brakes [Re: UCUDANT] #1691809 10/31/14 12:06 AM 10/31/14 12:06 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	The later 11.75" A/B rotor which fits (from memory) your spindles is a pretty stout piece. Suggest you use that. A good quality replacement rotor (parts store) should be fine. Newer formulation high po brake pads do not "out gas" much once broken in and I don't think slots or holes help much... and holes can start cracks.

Re: Upgrading 73 `Cuda style disc brakes [Re: UCUDANT] #1691810 10/31/14 12:49 AM 10/31/14 12:49 AM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	Replacement '68-'72 C-body rotors are identical to the unicast '73 and newer version except for the bearing bore sizes. The early C-body rotor will bolt to the early B/E body spindles using the original/same bearings. Contact info

Re: Upgrading 73 `Cuda style disc brakes [Re: DoctorDiff] #1691811 10/31/14 04:30 PM 10/31/14 04:30 PM
Joined: Jan 2010 Posts: 1,442 NW Chicago suburban area Mopar Mitch pro stock
Mopar Mitch pro stock Joined: Jan 2010 Posts: 1,442 NW Chicago suburban area	Dr. Diff -- For the 72-older spindles, using the 72-older larger C-body discs (and thus the 72-older smaller bearings, etc), are there special adapters needed for the calipers? Also, could light weight aluminum calipers, such as Wilwood (which part number?), be fitted accordingly? Mine is still 72-older spindles and stock calipers (actually, 72 calipers). 8317235-Mitch'sTA.jpg (348 downloads) Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!

Re: Upgrading 73 `Cuda style disc brakes [Re: Mopar Mitch] #1691812 10/31/14 07:19 PM 10/31/14 07:19 PM
Joined: Jan 2009 Posts: 813 Ontario,Canada brads70 super stock
brads70 super stock Joined: Jan 2009 Posts: 813 Ontario,Canada	Why not just us a C-Body spindle?

Re: Upgrading 73 `Cuda style disc brakes [Re: DoctorDiff] #1691813 10/31/14 07:22 PM 10/31/14 07:22 PM
Joined: Dec 2004 Posts: 801 central CT cudazappa super stock
cudazappa super stock Joined: Dec 2004 Posts: 801 central CT	Quote: You could also use '69-'72 C-body rotors, bearings and seals. These fit '72 and earlier B/E body knuckles out of the box. What's the diameter of these rotors? Also, what calipers would you use in this case? This is a really cool finding in this thread! 1971 Challenger

Re: Upgrading 73 `Cuda style disc brakes [Re: cudazappa] #1691814 10/31/14 10:51 PM 10/31/14 10:51 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	C-body rotors measure 11.75" x 1.25". I make brackets that mate first generation Viper calipers, C-body rotors and B/E body drum knuckles. Herman, who posted earlier in this thread, installed C-body rotors and pin type calipers on B-body knuckles using B-body 11.75" pin type caliper brackets. Contact info

Re: Upgrading 73 `Cuda style disc brakes [Re: DoctorDiff] #1691815 11/04/14 11:39 PM 11/04/14 11:39 PM
Joined: Jan 2003 Posts: 8,131 New Mexico UCUDANT OP Troll Hunter
UCUDANT OP Troll Hunter Joined: Jan 2003 Posts: 8,131 New Mexico	Quote: Herman, who posted earlier in this thread, installed C-body rotors and pin type calipers on B-body knuckles using B-body 11.75" pin type caliper brackets. On an E body? This is one that that tech editors disagree on At this point I'm still not certain, there are allot of options. I'm considering all that it en-tales Is the extra 'close to an inch" of brake worth the effort? This is really all for a street panic stop Dr Diff please PM me (or reply here) enough info so I can order your outer bearing (73 Cuda spindle to later C body rotors) adapter, once I locate the C caliper adapters. Thanks to you and everyone who provide parts we in the hobby truly need 8321706-DSCF1855.JPG (155 downloads) Last edited by UCUDANT; 11/04/14 11:54 PM.

Re: Upgrading 73 `Cuda style disc brakes [Re: UCUDANT] #1691816 11/05/14 06:58 AM 11/05/14 06:58 AM
Joined: Jan 2003 Posts: 3,575 The Netherlands BigBlockMopar master
BigBlockMopar master Joined: Jan 2003 Posts: 3,575 The Netherlands	No E-body, but A-body, and using the stock '73 A-body knuckles. An outer bearing spacer on the spindle and 2 washers behind the caliperbrackets was all I needed. Oh and maybe the seals in the rear of the rotors which came from a GM transmission. The C-body rotor swap also made the tracking width better, which is dearly needed on an A-body and wider wheels. BigBlockMopar.com

Re: Upgrading 73 `Cuda style disc brakes [Re: BigBlockMopar] #1691817 11/05/14 09:47 AM 11/05/14 09:47 AM
Joined: Jan 2003 Posts: 8,131 New Mexico UCUDANT OP Troll Hunter
UCUDANT OP Troll Hunter Joined: Jan 2003 Posts: 8,131 New Mexico	So the C body rotor changes track width?

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