Backing plate and drum question

Discussion in 'Suspension, Steering and Chassis' started by Mopar-Mitch, Dec 2, 2018.

  1. Mopar-Mitch

    Mopar-Mitch Well-Known Member

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    Will backing plates and drums from a 8.25 rear end work on a 8.75?
     
  2. 72Dart6pack

    72Dart6pack Harder Better Faster Stronger.

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    Nope.
     
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    • Alaskan_TA

      Alaskan_TA Well-Known Member

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      Yes.

      If the axle bolt pattern is the same for both.
       
    • Mopar-Mitch

      Mopar-Mitch Well-Known Member

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      Thanks, I wasn't for sure.
       
    • Mopar-Mitch

      Mopar-Mitch Well-Known Member

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      I have access to an abody 8.75 but it doesn't have axels or backing plates, if if I bought new axles with big lug pattern I was wondering if the backing plates and drums from the 8.25 would work.
       
    • Alaskan_TA

      Alaskan_TA Well-Known Member

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      My '70 Coronet had an 8 1/4" with 10" drums.

      I pulled the drum assemblies when the differential came out to install an 8 3/4" from a '69 & the original drum assemblies bolted right back on, I did not even have to remove the E-brake cables.

      I knew it would work though, not my first time......
       
    • Mopar-Mitch

      Mopar-Mitch Well-Known Member

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      That sounds great! I should be ok then, the complete drive line in my car came from a 1973 340 duster it has a 8.25 posi but airplane gears, 2.76 or so I'd guess, Im wanting to put the 8.75 in with lower gears. Love them 1970 coronets I've had 4 over the years.

      IMG_20181115_122439.JPG
       
    • Alaskan_TA

      Alaskan_TA Well-Known Member

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      Glad to help.

      Your drive shaft length will change though, unless you drill offset perch locating holes in your spring perches to allow your original driveshaft to be used.
       
    • Mopar-Mitch

      Mopar-Mitch Well-Known Member

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      Thanks, there's a shop in the next town west of me that does drive shafts, I'll just have it shortened.