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Rear Disc Brakes |
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mrdaud
AMC Apprentice Joined: Jun/30/2021 Location: North Carolina Status: Offline Points: 48 |
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Posted: May/15/2022 at 12:51pm |
I looked through the forum, but could not find an exact answer to my question. I have a '69 AMX with front disc/rear drums. I want to convert the rear to disc. I don't want Wilwood as they are way too pricey, near the $1000 range. There appears to be many common rear conversions for GM, Ford, Mopar in the $500 range or less. Did AMC use off-the-shelf brakes that also fit GM,Ford, etc., that would work on the AMX? I do have 15" rims that I think are required for disc brakes. For example, if the rear drums on the AMX were the same as a 6? GM, I should be able to use the conversion kit quoted for the GM. Anyone know? Thanks!
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11453 |
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What's the appeal of rear discs? A properly working front disc/rear drum set up is balanced, and stops on a dime.
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7882 |
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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3748 |
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The first question is what kind of tires do you have? If you are not using summer only extreme performance tires, you will gain much more from tires than you will from rear disc brakes.
Discs are obviously superior for cooling if you are road racing. For a street car, 99.9% of what people have here, rear discs are not needed. Yes, I know they are sexy.
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4051 |
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These guys make a kit using GM calipers and their own brackets. I had one of their kits on the rear of my Jeep CJ for years. Bob tufcj |
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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Mopar_guy
Supporter of TheAMCForum Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4794 |
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Yep. This right here ^^^^
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"Hemilina" My 1973, 5.7 Hemi swapped Javelin |
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mramc
AMC Addicted Joined: Jul/12/2007 Location: United States Status: Offline Points: 3217 |
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Sorta answering the original question 1) The AMC Factory 68/69 Trans-AM Javelins had rear disk brakes fabricated from GM/ Corvette style rear disk brakes set up. Per say never really a "Stock" option. 2) What I did myself was Lincoln Versailles ford nine inch with a new replacement stainless steel disk brake set up. I was all rebuilt and yes it cost at the time . But like I said every thing got rebuilt. 3) There are still Jeep CJ rear disk brake kits for the Dana 20. They run not a $1k but more like $800 to $700 so not much cheaper then your $1K price you want to be below. Period AMC built Jeep CJ s used an AMC 20 series rear same as V-8 AMCs . The sticking point of the Jeep CJ kits are the rear axles. You may have to have axle made to fit the AMC car 20 rear end. So not cheap project on any level. The Jeep axles are shorter the the car axles depending on what car you want to put he rear disk brakes on you may have to have axles made. Not cheaper either. Larry Daum
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LRDaum
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7882 |
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I went into my AMC dealer parts department back in about 1971 or 72 and tried to order the rear disc brake setup. The rear discs were listed in the parts book and had to be ordered directly from Ronnie Kaplan (part # 448 5732 and 33). The guy behind the parts counter told me that I didn't need it, and said it was too expensive. I don't remember how much it was. My guess is that he didn't want to fool with ordering it. Anyway, I didn't order it from AMC, but I put rear discs on my AMX years later. I don't remember where I bought the setup, or what it was sourced from.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6672 |
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Waste of time and money for anything other then a bracket or full out track car.
I only did this because the Ford 8.8 was the only differential that was economical at the time. If you like the bling, then spend the money, but your not going to improve on braking performance unless your doing over 120 MPH. At less then this speed, the rear only provides 20% to 30% of braking. Plenty for the drum brakes to handle. |
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mramc
AMC Addicted Joined: Jul/12/2007 Location: United States Status: Offline Points: 3217 |
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The Ford 8.8 is a good choice too. If i was doing a four disk brake setup today this probably be the way to go, for a custom setup. LRDaum
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LRDaum
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