Drum Brakes to 4 wheel power disc conversion

Discussion in 'Classic (70's) Dodge Challenger' started by Tonycuc, Apr 10, 2017.

  1. Tonycuc

    Tonycuc New Member

    Joined:
    Mar 22, 2017
    Messages:
    5
    Likes Received:
    2
    Gender:
    Male
    Location:
    FL
    Vehicle?:
    Challenger
    Model Year?:
    1970
    Trim?:
    R/T
    Color?:
    HEMI Orange
    Transmission?:
    6-Speed
    I'm in the process of installing 4 wheel disc brakes on my 70 challenger R/T. While the install is finished, my 15" wheels are hitting the caliper and can't be put back on. does anyone have any idea or experience with this problem?
     
  2. Cuda SRT8

    Cuda SRT8 Member

    Joined:
    Mar 20, 2010
    Messages:
    116
    Likes Received:
    17
    Location:
    East S.F. Bay Area
    Vehicle?:
    2010 B5 Classic
    Trim?:
    R/T
    Color?:
    B5 Blue
    Transmission?:
    Auto
    It sounds like you've installed an aftermarket conversion kit and are installing original wheels or even aftermarket 15" wheels when the kit will only accept 16" or 17" wheels.

    Will the wheels fit on the rear (usually smaller calipers)? You're either going to need to change to a 17" wheel / tire combo or possibly have you stock wheels cut and re-welded with the necessary offset to move the "step" in the barrel out away from the caliper.

    I once did this when putting '70 rally wheels on a '73 Dodge van. A place called Stockton Wheel in Stockon Calif can do this. They put the wheel on a lathe and cut the welds; moved the center out to your provided measurement and re-weld. This was a long time ago, but I believe they are still in business.
    Good luck
     
    FastMikeR1 and BAD GRANDPA like this.
  3. Drewcrane

    Drewcrane Member Photo Winner!

    Joined:
    Jan 18, 2014
    Messages:
    470
    Media:
    1
    Likes Received:
    310
    Location:
    Colorado
    Vehicle?:
    2012
    Trim?:
    R/T Classic
    Color?:
    Tungsten Metallic
    Transmission?:
    Auto
    What did you use for brakes factory or ? I did the same thing on our vintage cuda and challenger,used wilwoods and 15,s will mount on no problem did you go larger than 10.75 for rotors? I am running 17,s on the cars now,so yes you might have to consider a wheel change
     
    BAD GRANDPA likes this.
  4. Tonycuc

    Tonycuc New Member

    Joined:
    Mar 22, 2017
    Messages:
    5
    Likes Received:
    2
    Gender:
    Male
    Location:
    FL
    Vehicle?:
    Challenger
    Model Year?:
    1970
    Trim?:
    R/T
    Color?:
    HEMI Orange
    Transmission?:
    6-Speed
    thanks, I found out I have to change the rims as they are for drum brakes only. thanks for your answer, i had a feeling but wasn't sure.
     
    Drewcrane and BAD GRANDPA like this.
  5. deano379

    deano379 Member Public Safety

    Joined:
    Apr 2, 2012
    Messages:
    390
    Media:
    1
    Likes Received:
    1,218
    Location:
    Utah
    Vehicle?:
    11 Challenger
    Trim?:
    SRT-8
    Color?:
    Black
    Transmission?:
    Auto
    I changed the drums on my 63 Plymouth Savoy to the OE 70s disc in front. Both the OE 15X5 1/2" and 15X6" steel wheels fit OK.
     
  6. Tonycuc

    Tonycuc New Member

    Joined:
    Mar 22, 2017
    Messages:
    5
    Likes Received:
    2
    Gender:
    Male
    Location:
    FL
    Vehicle?:
    Challenger
    Model Year?:
    1970
    Trim?:
    R/T
    Color?:
    HEMI Orange
    Transmission?:
    6-Speed
    I found out there are different factory rims for drum & disc brakes so I ordered 5 new rims as I want to keep the factory wheels & tires.
     
  7. Dodgeguy

    Dodgeguy Highway Star Member Relations Photo Winner! MOTM Winner! Public Safety

    Joined:
    Jul 11, 2010
    Messages:
    28,321
    Media:
    69
    Albums:
    5
    Likes Received:
    35,728
    Gender:
    Male
    Location:
    Tucson
    Vehicle?:
    Challenger
    Model Year?:
    2010
    Trim?:
    R/T
    Color?:
    HEMI Orange
    Transmission?:
    6-Speed
    I never ran into that before but it is possible. I switched to discs on a 71 and had no issues with the wheels.
     
  8. BlueStreakBob

    BlueStreakBob Active Member

    Joined:
    Apr 8, 2012
    Messages:
    1,924
    Media:
    6
    Likes Received:
    118
    Location:
    Near Chattanooga TN
    Vehicle?:
    '12 Challenger
    Trim?:
    SRT-8
    Color?:
    Blue Streak Pearl
    Transmission?:
    Auto
    With after market big disc brake set ups, it is necessary to step up the wheel diameter and with some it will take a special wheel to fit the calipers behind the wheels regardless of offset. Be prepared to do some searching to get the proper set of wheels.
     
  9. cdahl383

    cdahl383 Senior Member MOTM Winner!

    Joined:
    Mar 4, 2012
    Messages:
    11,757
    Media:
    82
    Albums:
    5
    Likes Received:
    8,936
    Gender:
    Male
    Location:
    Detroit, Michigan
    Vehicle?:
    2015 Challenger
    Trim?:
    R/T Scat Pack
    Color?:
    Sublime
    Transmission?:
    8-Speed Auto
    I did the conversion on my 72 Nova in the front, but I went with a kit from Wilwood that fit with 15" rims. Most aftermarket brake kits are made for 16-17" rims or bigger. Sounds like you either need different rims or you need to order a kit that is made to fit 15" rims.
     

Share This Page