Rear disc brake conversion
#450929
08/26/09 03:41 PM
08/26/09 03:41 PM
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Anonymous
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Anonymous
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My project has been on hiatus for the last 4 years as other life events took priority over it. I quit subscribing to all the magazines and stopped perusing the tech aspects of our hobby. I now have the time and money to start again on my '64 Fury. It has a '68 8-3/4 SG out of a RoadRunner in it now. My question is....has anybody came up with a cost effective, good working rear disc brake setup for these drum rearends?
First of many questions to come I am sure.
Thanks for any info!
Wes
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Re: Rear disc brake conversion
[Re: AndyF]
#450931
08/26/09 04:31 PM
08/26/09 04:31 PM
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Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
Talk to Cass at DoctorDiff.com and he'll set you up. His rear disc system is the best one on the market. I know that sounds odd because he runs a small shop compared to SSBC, MP Brakes, Baer, etc but he did the proper engineering and some of the big guys didn't. His setup works with the tapered roller bearings for example and it bolts on without a bunch of clearance issues.
 I have his 11.7" rear kit on the 8.75" in my 66 Coronet. He can supply the emergency brake cables also, which can be a pain in the azz to get right -
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Re: Rear disc brake conversion
[Re: Real-Fury]
#450935
08/26/09 08:17 PM
08/26/09 08:17 PM
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Anonymous
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Quote:
Wes,
I recently acquired 64 Fury and have been away from the muscle car scene for 30+ years so I have tons of questions as well. I've been thinking about many updates and modifications including installing a SG rearend and disc brakes. I've been told if I want to install a SG I might as well get rid of the stock 64 style rearend and install a later 65-67 unit as it's supposed to be pretty straight forward. But, no one mentioned using a 69 RR rearend. Will you have to make any changes to the spring hangers, frame rails or the body to accomodate a RR rearend? It sounds like a pretty good option if it isn't too complicated.
BTW, what is the width of the 69 RR rearend?
Thanks,
Butch
Thats a good question. If I recall the '68 B body rear end is maybe 1/4-1/2 inch wider but the perches are the same. I could be wrong but thats my recollection. I wanted a sure-grip but really wanted to get rid of the tapered axles.
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Re: Rear disc brake conversion
#450936
08/26/09 10:56 PM
08/26/09 10:56 PM
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Joined: Feb 2003
Posts: 415
Indiana
Pentastar440
mopar
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mopar
Joined: Feb 2003
Posts: 415
Indiana
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Do you know what the disc setup weighs compared to drum brakes ?
'65 Belvedere II - 446-Indy,727 transbrake,Dana 4.56
'38 Plymouth 4Dr - 408SixPack, A518, Dana60 4:10
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Re: Rear disc brake conversion
[Re: Real-Fury]
#450938
08/26/09 11:58 PM
08/26/09 11:58 PM
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Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
That is a really clean installation Lefty! I'll bet she stops on a dime now! Is that a stock 66 Coronet rearend? Is that an aftermarket swaybar I see attached and did it improve handling?
Butch
Thanks Butch,
It is a stock 66 Coronet diff with a 742 power lock center. The rear sway bar is adjustable for tuning over/under steer. It's from Hotchkis and comes as a front/rear set with a hollow front bar. The front brakes are 12.2" Wilwoods with four piston Dynalite calipers. The master cylinder is a 7/8" piston Wilwood manual brake setup using a 6-1 pedal ratio. She stops real good now and the handling is vastly improved... 
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Re: Rear disc brake conversion
#450939
08/27/09 08:42 AM
08/27/09 08:42 AM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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Just to be clear, why the desire/need/useage for rear discs? Normally $ is always better spent on a big front brake upgrade first.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Rear disc brake conversion
[Re: jcc]
#450940
08/27/09 09:07 AM
08/27/09 09:07 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I am adding rear discs to my 65 dart 8&3/4 mainly because I have a pair of late model SBP rotors from something that I have been tripping over for years. My bias might be off but to putt around town I'm not worried and I've heard all the hype pro/con so I want to know 1st hand.
live every 24 hour block of time like it's your last day on earth
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Re: Rear disc brake conversion
[Re: jcc]
#450941
08/27/09 02:04 PM
08/27/09 02:04 PM
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Anonymous
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Anonymous
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Quote:
Just to be clear, why the desire/need/useage for rear discs? Normally $ is always better spent on a big front brake upgrade first.
I already did a front disc conversion using parts from a Dart. It really is a matter of how the discs look behind the wheel openings versus the drums.
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Re: Rear disc brake conversion
[Re: jcc]
#450942
08/27/09 02:11 PM
08/27/09 02:11 PM
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Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
Just to be clear, why the desire/need/useage for rear discs? Normally $ is always better spent on a big front brake upgrade first.
You can modulate the brakes much better than with rear drums. Especially when running on the ragged edge... 
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Re: Rear disc brake conversion
[Re: AndyF]
#450946
08/28/09 11:25 AM
08/28/09 11:25 AM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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Quote:
Talk to Cass at DoctorDiff.com and he'll set you up. His rear disc system is the best one on the market. I know that sounds odd because he runs a small shop compared to SSBC, MP Brakes, Baer, etc but he did the proper engineering and some of the big guys didn't. His setup works with the tapered roller bearings for example and it bolts on without a bunch of clearance issues.
I have his brake parts on both my '68 A-body vert and my '70 e-body. The '68 has manual brakes and the '70 has power. The front-to-rear bias, minimal pedal effort and customer service are spot on!
I used his most economical conversions on both cars; the 11 3/4 Mopar unicast fronts & the 2006 Mustang Cobra R rears with parking brakes & steel brackets. He also supplied custom parking brake cables that fit like stock.
I've never driven a car with such nicely balanced brakes, and his prices were good as any and better than most delivered to my door. His tech help is top-shelf.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Rear disc brake conversion
[Re: roadrunninMark]
#450947
08/28/09 04:53 PM
08/28/09 04:53 PM
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Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
Lefty,
is the pic that shows a bracket for the e cables, is that a factory bracket or did you add it?
Mark
That's the stock 66 Coronet factory bracket. 
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