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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: 1,101

    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?

    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.


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


    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: 3,625

    Dirty Dug

    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: 183

    ENUF 41

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

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