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Dana 70 vs. 14 bolt help

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by four_by_ken, Nov 28, 2001.

  1. four_by_ken

    four_by_ken 1/2 ton status

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    Always had experience with 14 bolts. Can someone do some comparing to a Dana 70.

    Thanks
    Ken H.

    '86 K5 up and coming
    14 bolt(Detroited),10 bolt,39.5 Boggers rear,
    TSLs front, 468 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Like what kind of "comparing"?


    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  3. four_by_ken

    four_by_ken 1/2 ton status

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    Why would I want one over the other? Strength, ground clearance, locker choices, ring and pinion prices, locker prices, andthing you can think of. :-)
    I may have the opportunity to put either one in my truck.

    Ken H.

    '86 K5 up and coming
    14 bolt(Detroited),10 bolt,39.5 Boggers rear,
    TSLs front, 468 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    The best thing I like about the 14FF is the pinion being supported by that little roller bearing on the gear end. Much like the Ford 9" rear. That little bearing makes the rear that much stronger. Plus, they are very easy to work on and set up ring and pinions. [​IMG]
    Another positive: They are very cheap and plentiful.
    The only downside is the limited selection of gear ratio, which stops at 5.13 and also the limited selection of lockers, too. [​IMG]

    I would still pick a 14FF over the D70 any day! [​IMG]


    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  5. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    The Dana, I think, can be geared down to 7.17:1. The 14 bolt I think stops at 5 something. ARB makes a locker for the 70, so does Detroit. Ground clearance is better with the 70. Down side? Harder to find than a 14 bolt. Also, the 14 bolt's locker is cheaper than the 70 locker. Hope this helps.

    Red 1989 GMC Suburban SLE V1500 - TBI 350, 700R4 w/ shift kit, Quad-shock front, 31/10.50/15 Pro Comp MT, 4.10 gears, Duals off cat
     
  6. Boss

    Boss 1/2 ton status Author

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    1 other comparison not mentioned yet, is that the 14bolt has 30 splined shafts and the 70 has 35 spline shafts. Both 1.5" diameter though.
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  7. four_by_ken

    four_by_ken 1/2 ton status

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    Hmm... since the 14 bolt shafts, for the most part, are strong enough(is that possible). Dont know if I would want to pay the extra for the Dana 70 items. I have seen a few 14 bolt shaft break, but not very common.

    Thanks everyone,
    Ken H.


    '86 K5 up and coming
    14 bolt(Detroited),10 bolt,39.5 Boggers rear,
    TSLs front, 468 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  8. michaelm

    michaelm 1/2 ton status

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    I have a 70, it is strong and parts can be had anywhere through Dana/Spicer dealers. mine had 32 spline axles so i had to upgrade the axles to match my 35 spline detroit.
    you can still buy a new dana 70, the same cannot be said for a 14bolt.

    I like the 14 bolt for many of the above reasons, wes mentioned the extra pinion support and hinted at the adjustable carrier so you dont need a bunch of shims to adjust the gear depth or case spreader to pull the carrier
    the removable pinion bearing retainer is a plus
    5.13 is lower then i need
    readily available disc brake kits is a huge plus, though they use the rubber bushed chev calipers.
     

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