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8" vs 9" Ford rear end weight

Discussion in 'The Hokey Ass Message Board' started by 50flathead, Oct 16, 2008.

  1. 50flathead
    Joined: Mar 8, 2005
    Posts: 1,100

    50flathead
    Member
    from Iowa, USA

    With all else being equal( length, brake style, etc.) Does anybody know the difference in weight between and OEM 8" and the 9" Ford rear ends?
     
  2. FORD REAR END WEIGHT COMPARISON

    8-inch Rear End Assembly Weight : 170 lbs.

    1. Housing: 36 lbs.

    2. Axles: Medium Journal, 28-spline -15 lbs. ea.

    3. Brakes: Small 10" x 1¾" Drum Assemblies - 22 lbs. ea.

    4. 3rd Member: Reinforced Revision 8-inch Case - 60 lbs.




    9-inch Rear End Assembly Weight: 194 lbs.

    1. Housing: 38 lbs.

    2. Axles: Large Journal, 28-spline - 18 Lbs. ea.

    3. Brakes: Massive 11-1/32 x 2½" Drum Assemblies - 26 lbs. ea.

    4. 3rd Member: Conventional Diff. - 68 lbs.
    a. w/Traction-Lok Diff. - 71 lbs.

    (24 lbs. Difference Between Drum Brake 8" & Drum Brake 9" Rear End Assembly).




    Versailles Disc Brake Rear End Assembly Weight: 215 lbs.

    1. Housing: 39 lbs.

    2. Caliper: w/Pads, Anchor Plate & Flexible Brake Hose - 24 lbs. ea.

    3. Axles: 20 lbs. ea.

    4. Rotors: 10 lbs. ea.

    5. 3rd member: Conventional Diff. - 68 lbs.

    (45 lbs. Difference Between Drum Brake 8" & Disc Brake 9" Versailles).
     
  3. Deuce Roadster
    Joined: Sep 8, 2002
    Posts: 9,520

    Deuce Roadster
    Member Emeritus

    If you are concerned about the weight ... a aluminum center section saves 20 lbs.

    [​IMG]

    And if your 9 inch has the small axle bearings, you can use the smaller but lighter 8 inch brake backing plates and drums.

    [​IMG]

    I believe the added strength of the 9 inch over a 8 inch is worth the small weight gain myself. I use the aluminum center section and aluminum Daytona pinion retainer because I had them :)
     
  4. Dirty Dug
    Joined: Jan 11, 2003
    Posts: 3,549

    Dirty Dug
    Member

    8" third members weigh a lot more than sixty pounds when they're resting on your chest while installing, even more when you knock a stud out of the housing while trying to heft it into place flat on your back and have to start over.............
     
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  5. ENUF 41
    Joined: Dec 24, 2016
    Posts: 160

    ENUF 41
    Member

    AMEN, 8" third member felt like a 100# laying on my back and hoisting it about 2 foot today!!
     

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