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1940 ford convertible axle size

Discussion in 'The Hokey Ass Message Board' started by carl.p, Nov 12, 2012.

  1. carl.p
    Joined: Jan 12, 2009
    Posts: 74

    from grimsby uk

    Hi I have just bought a 1940 deluxe convertible and want to fit a Chevy axel that is 60" wide with 7" or 8" wide steel wheels with 235/70/15 tyres , will this work and what back space do I need thanks for your help Carl :D
  2. gearheadbill
    Joined: Oct 11, 2002
    Posts: 1,313


    probably going to be too wide, esp. with 8" rims if you want any depth to the front space of the wheel. I am re-doing a 36 pickup (same frame and axle width as 40) that has a 8.5 10 bolt that is like 61". The wheels are going to need to be really flat faced to work. 56-58" is better.
  3. 68-74 Nova

    67-69 Camero or Firebird

    57-59 Ford

    Maverick & Granada

    Hope this short list helps.HRP
  4. Russco
    Joined: Nov 27, 2005
    Posts: 4,261

    from Central IL

    I think about 57"-58" would be Ideal

  5. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,308

    from Quincy, IL

    One way you can figure this out for your particular car is to mount tires of the size you want to use on the wheels you intend to use. Then measure the width inside the rear fender opening to the other side, allowing clearance for the tires. Having determined the width needed for the tires to clear the inside of the fenders, set the wheels/tires up with that spacing and measure from inside one wheel to inside the other. Voila' know the axle width that is ideal.

    Depending on what that distance/width is, you may decide to juggle the wheel width or wheel offset or the amount of wheel clearance that is acceptable to get a combination that suits your goals.

  6. 19Fordy
    Joined: May 17, 2003
    Posts: 7,561


    FYI. The stock WMS to WMS of a 1940 Ford car is 59 1/2 in. Many folks use the Maverick rear that is 56 1/2 in. WMS to WMS. The 1990-95 Ford Explorer 8.8 in. rear with disc brakes is 59 1/2 in wide WMS to WMS, but has a pinion offset that is about 2 in (I am told.)
  7. 40FordGuy
    Joined: Mar 24, 2008
    Posts: 2,907


    19Fordy,....You're right; That Explorer unit does have an offset (to the right) driveshaft,...but it'll work fine in a 40 installation. Ford used them with that offset on some export frames, 2 wheel drive Explorers, as well as ones sold to delivery vehicle makers.
  8. Ole don
    Joined: Dec 16, 2005
    Posts: 2,915

    Ole don

    1990 and older Ranger Super Cab had an axle measurement of 56 5/8. You will have to cut the mounts off, weld on new ones, and straighten the housing after the welding. Be careful you don't choose one with small brakes. Mine is a 3.73 traction loc.
  9. joel
    Joined: Oct 10, 2009
    Posts: 2,139


    I have a 68 Nova in my 40 with 15X7 in back. The tires are 235-70 15 and the wheels have 3 1/4 front measurement and 4 3/4 back set. I could have used 3 1/2 front and 4 1/2 back set. 8 in wheels can't go much more offset in front and would require you to go 5 1/2 back set. I didn't use the 8 in wheels because I could'nt get any with the 5 1/2 back set. Caution ! do your own mock up before buying.
  10. Pewsplace
    Joined: Feb 10, 2007
    Posts: 2,800


    Here is what I use on 40's.
    * 57 inch wide rear axle - 57-59 Ford or purchase a new one
    * 8 inch wheel with a 4 inch backspace
    * 235x75 (70)x15 in tire

    Nice ride and they fill the fender wells without cutting the inner wheel wells.
  11. hotrod40coupe
    Joined: Apr 8, 2007
    Posts: 2,562


    I'm running a '57 Chevy rear end with GR70-15 on a 7 inch wheel with no problems in my '40.
  12. carl.p
    Joined: Jan 12, 2009
    Posts: 74

    from grimsby uk

    Thank you for your replys Carl

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