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D70 HD dually(wide width) info. 14ff srw, D70 dually and 14ff C&C HUB comparision.

Discussion in 'The Garage' started by Emmettology 101, Jul 30, 2006.

  1. Emmettology 101

    Emmettology 101 3/4 ton status

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    Just picked up my new(to me) D70HD that I bought off of Tyler "blueblazer62". His friend and fellow board member, Jason "texascadillac42" dropped in off enroute to NY... Thanks guys!! :thumb:


    Ok, onto the nitty gritty... :D

    So when I was searching for a wide width dually axle, I didn't find much info on brakes and such.. Figured since I have one at my disposal now, I would take some measurements for everyone.... If I dont include and info that you are looking for, pm me and I will get it and add it in...

    My plans are to take this axle and add 14FF SRW hubs to it, to bring the width out close to a DRW D60. Will also be adding disc brakes to this with the help of Kert from DIY4x.com.

    According to my readings on the internet, a 14ff hub and D70 hub have the same bearings, seals and bearing spacing. I will measure both spindles to comfirm this at a later date. The 14ff SRW hubs I have slipped right ont he spindle without a problem.


    D70 HD Measurements/info:

    The ring gear that came with this axle was stamped "75". So the housing should be the same unless it was changed somewhere in it's life.

    Also, this D70 doesn't use the same spindle nut configuration as the 14ff. My D70 has ONE thick(about 1/2") nut with "U" shaped notches similar to the 14ff and is locked in place by a keyway and snap ring. THis is similar to the 88+ 14ff axles.

    WMS - WMS: 73.375" - Stupid me didn't take a wms-wms measurement before I pulled the factory hubs. So I will replace this with an actual measurement when it cools off some.. Came about this measurement by subtracting the width that the 14ff SRW hubs added.

    Axle flange outer hub width: 4.480"

    WMS face to end of hub(axle flange end): 3.8125"

    End of hub(seal side) to backside of the WMS flange: 1.6875"

    End of hub(seal side) to WMS flange face: 2.09375"

    Axle tube width(main section)(apporximate): 4"

    Axle tube width between brake flange and hub(approximate): 3.5"

    Brake flange bolt width(approximate): 3.375"


    D70 HD axle shaft measurements:

    Length(approximate): 39.750"

    Shaft diameter from flange to where is necks up to the splines: 1.380"

    Shaft diameter width right before splines: 1.450"

    Shaft diameter on splines: 1.490"

    # of splines: 35


    Measurements with the 14ff SRW hubs on D70HD axle(with nuts tightened):

    WMS - WMS: 77.500"

    Outside of brake flange(facing wheel hub) to rotor face of wheel hub: 8"

    Pic of D70 HD dually axle brake flange with 14ff SRW hub:
    [​IMG]









    14ff SRW, D70 HD dually and 14ff C&C hub comparison:

    Pic - 14ff SRW hub, d70hd dually hub and 14ff C&C hub:
    [​IMG]
    [​IMG]


    14ff SRW hub measurements:

    Across axle flange face: 4.495"

    Face of WMS flange to End of hub(flange face): 1.750"

    End of hub(seal side) to backside of WMS flange: 3.750"

    End of Hub(seal side) to face of WMS flange: 4.21875"


    D70 HD dually hub measurements:

    Across axle flange face: 4.480"

    Face of WMS flange to End of hub(flange face): 3.8125"

    End of hub(seal side) to backside of WMS flange: 1.6875"

    End of Hub(seal side) to face of WMS flange: 2.09375"


    14ff C&C hub measurements:

    Across axle flange face: 4.476"

    Face of WMS flange to End of hub(flange face): 3.8125"

    End of hub(seal side) to backside of WMS flange: 1.6875"

    End of Hub(seal side) to face of WMS flange: 2.09375"



    So it looks like the D70 HD dually hub is the same as the 14ff C&C hub. And I am guessing that the width difference across the axle flangle is due to paint and corrosion difference of the three hubs.



    **Update 7-30 8:15pm**

    I went out in the garage after it cooled off some. Got to slide an axleshaft in to see how the shaft bolt pattern on the D70 lined up with the 14ff hub pattern. Got 4 bolts in and they lined up perfectly!!! Wont have any problems getting the other bolts in!



    Hope this helps!
     
    Last edited: Jul 30, 2006
  2. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    what axle shafts are you using
     
  3. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    The original D70HD shafts will work. :wink1:
     
  4. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    Now is this chevy dana 70 from a non-cab chassis dually?
     
  5. Emmettology 101

    Emmettology 101 3/4 ton status

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    I'll be using the stock 70 shafts.

    And the D70hd I have is from a pick-up dually(normal pick-u fleetside with the fender extensions) which is the wide verison..
     
  6. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    Cool, good stuff keep it comeing I assume brakes are gonna be an issue with that much distance from the backing plate mount to the WMS close to 7-8" correct?
    I'm looking for simular options I'm wanting to run H-1 wheels also I have the dually 60 front looking for Non-spacer options in the rear
     
  7. Jimbo*

    Jimbo* 1/2 ton status

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    Yellow K20, When you figure out what you want to go with, I've got a couple of 70HD's close to you.
    Jimbo
     
  8. MTMike

    MTMike 1/2 ton status

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    Awesome info, Mike! Thanks! :bow::bow::bow:

    My question of the day for you is this: Do you forsee any "issues" or special requirements to do a disc conversion on a D70HD vs a 14BFF? I've got some 14bFF disc brackets that I bought with a won gift cert (Thanks Gravel Maker!!!) and am unsure how this disc conversion will go

    Thanks for any info!

    Mike
     
  9. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    A disc conversion will take a little more work than a 14 bolt. The distance between the backing plate flange and hub seal is considerable greater (4.5"~5").
     
  10. Emmettology 101

    Emmettology 101 3/4 ton status

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    Yes a disc onversion is going to be harder. The brake backing plate flange is 8" from the back side of the hub flange. So looks like I'll have to go with a weld on bracket for the discs... Haven't heard back from Kert yet to see what kind of ideas he may come up with...
     
  11. boz42

    boz42 1/2 ton status GMOTM Winner

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    not really harder, just different. u are doing the same thing i did a year ago.http://http://coloradok5.com/forums/showthread.php?t=109482 i bought some weld on caliper brackets for $7 each & added some plate to them to beef them up at the base & welded them on. the rest of the parts are the same as a regular 14 bolt disc swap.
     
  12. Emmettology 101

    Emmettology 101 3/4 ton status

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    Just meant harder as you cant just go buy a bolt on bracket. :D

    Your link isn't working for me.... :(
     
  13. boz42

    boz42 1/2 ton status GMOTM Winner

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  14. Emmettology 101

    Emmettology 101 3/4 ton status

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  15. boz42

    boz42 1/2 ton status GMOTM Winner

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    lemme look i don't think i do
     
  16. boz42

    boz42 1/2 ton status GMOTM Winner

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    your lucky day i had 2, but they are crappy pics. any how don't do like me & weld them on before thinking about your pinion rotation. nothing can hit them be cause of the rim, but it would look better & be easier to bleed if they were higher up on the axle

    [​IMG]


    [​IMG]
     
  17. Emmettology 101

    Emmettology 101 3/4 ton status

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    Ah, good point! Thanks for the tip! I may grind down the old brake flange some also just for appearance reasons.. :D
    With the DRW front hubs, does you calipers stick out past the wheel much?
     
  18. boz42

    boz42 1/2 ton status GMOTM Winner

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    no problem, glad to help.

    they stick out a good bit
    [​IMG]
     
  19. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    Thanks for the offer. I have a ford Van width 70 but it has 3.31 gears plus then I'd have ford parts on my truck....yuck!
     
  20. jason m

    jason m 1/2 ton status

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    not trying to change what you have heres, but i have read and have a set of single wheel rear dodge dana 70 hubs that look just like the front SRW front 60 hubs. now "if" the 70 rear ( dodge ) hubs bolt to the 60 front could you do the swap backwards, take a set of DRW front 60 hubs and put them on a rear dana 70. this would give you a rotor closer to your axle and making it easyer to weld a bracket on and maybe now we could find a use for all those DRW front hubs on the dodge 60, jason.
     

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