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this is probably a silly question, but will your backspacing change when you switch from drums to discs? or is it the same? ???thanks
 

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No it won't, the disc rotor is the same thickness at the axle connection.
 

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Dodgenut. I replaced my factory drum brake set-up on my Roadrunner with Wilwood rotors and calipers. The set cost $425.00. The rotor is thicker than the drum and moved my wheels out approx. 3/8 of an inch. or so. Hope this helps.

Moparteacher
 
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?? -- The set cost $425.00

Do you have any more information on that kit? The ones i've been looking at started at $650+

Thanks!!
Jim
 

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I purchased both front and rear from Hot Rod Heaven. They sent me a free porportioning( ???spelling?) valve, and three quarts of wilwood fluid DOT 5. Check for a discount code on the web site before placing an order. I received front and rear drilled rotors, front lines (steel braided), valve, fluid, shipped free for under a grand and that was after the additional cost of drilled rotors. Keep in mind that these (drilled, non-vented) rotors are recommended for light vehicles. The rotors and set-ups are common on Stock Eliminator cars and some Super Stock or slower bracket cars; I don't think they would be a good idea for street applications, high speeds (125mph plus) and heavier cars.

Moparteacher
 

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Just checked and they are $539.95. I ordered them about 8 months ago. This set does not have the parking brake set-up. They still offer a coupon for shipping (-$20.00) or free shipping plus the previously mentioned parts for front and rear orders. Check the coupon folder first.

Moparteacher
 

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Aerospace Components offers a rear disc kit for $456.00. Someone also sells a caliper adapter on e-bay to put G.M calipers on your mopar. You can also purchase a caliper bracket that clamps onto the housing tube for a G.M. caliper ( I think) from AFCO and other roundy-round parts suppliers. Check the circle track suppliers, they have all kinds of goodies for control arms, caliper brackets, shocks, adapter this and adapter that type stuff.

Moparteacher
 
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Ummm... YES it changes the required backspacing. The hat is 1/2" thick, so that's going to space your wheels out 1/2" on each side. The drum flange is only like 1/8" thick.

Carter
 

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My Wilwood rear brakes are only 1/4" thick...not too far off from a drum thickness at that point. Maybe an 1/8" thicker?
 
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Wierd - I have the Wilwood drag kit and the hats are 1/2". You aren't measuring the rotor are you?
 

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Well, I have the Wilwood Prostreet 12.19" rear discs. It is exactly a 1/4" where it sets on the axle face. It spaces the wheel out exactly a 1/4" from the axle face. The directions even have it measured at 1/4". It's a 1/4" :D
 

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sounds like were are comparing apples to oranges o[ o[...... depending on what kit you get....will determine the rotor hat thickness. that will determine how far past your fenders the rear tires be **(*) LOL
 
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Wow - that's a big difference. That makes it a bitch to plan for eh? Wonder why the drag kit (11 1/2" rotors) has a thicker hat than the bigger 12.19" rotor? Anbody? Bueler? Bueler?
 
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