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Dana 60 vs. 14 bolt ff

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by JunkYardCrawler, Nov 20, 2001.

  1. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    i';m thinking of running 44s later on down the road. from what i can gather the 14 bolts can only go to 5.13's. where as a dana 60 can go to 7.17's. is this correct for front and rear D60s?
     
  2. Brians 60s

    Brians 60s 1/2 ton status

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    if you want to go with lower gears than 5.13, and your gonna run 44s, forget the 60 and just go with a 70. you can get ultra low gears for one and it is just as strong as a ff 14 bolt.

    IT'S A 1 TON THING.... IF I HAVE TO EXPLAIN IT, YOU WOULDN'T UNDERSTAND!!!
     
  3. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Front and rear D60s use the same r/p as far as I know. Never fooled with a rear D60. With 44s I would also suggest a D70. Also, most D60 rears will have the low spline (14? not sure but weak) axles. I know that it is possible to upgrade the rear but I don't know what is required (hmm, swap a high spline count front carrier with custom axles?). D70 is just as strong as a C14 but with better gear selection. A D70 usually has to be cut down from a dually although they can sometimes be found the right width (or close enough) from Vans etc. C14 benefit is cheap, common, and easy locker install.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  4. wayne

    wayne 3/4 ton status

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    14ff with 5:13's and a doubler t case and you have the best of both worlds.[​IMG] Hell Watson runs 42's with 5:13's and you know he uses it for hardcore stuff.[​IMG]

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  5. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    i am leaning towrads the 14. manly because i have one. it just need a compleate rebuild.
     
  6. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    i am leaning towrads the 14. manly because i have one. it just need a compleate rebuild. i'm looking to run the NV4500 and the doubler set up. so i can have the 7.17's and still drive on the free way.
     
  7. Brians 60s

    Brians 60s 1/2 ton status

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    One thing you should also be aware of when going really low is strength. You loose strength the lower the gears you go. If you were to look at the pinion from a dana 60 in say,
    3.73, 4.10, 4.56, 5.13, 5.86, 6.17 etc etc, you would most certainly choose the 3.73. The reason is because the pinion size greatly decrease the lower of gears you go. a 3.73 has a monster pinion that would be hard to break, a 5.13 set has a pinion about the diameter of a soda pop can, and it only gets worse from there, not to mention the heating problem associated with a pinion that small. My friend with 6.17s went through both front and rear pinions every few hundred miles, he had a lot of power and was turning big tires. Every time he serviced his diff, pinion teeth were in the bottom of the housing. Just something to think about.

    IT'S A 1 TON THING.... IF I HAVE TO EXPLAIN IT, YOU WOULDN'T UNDERSTAND!!!
     
  8. Executioner

    Executioner 1/2 ton status

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    There are lots of reasons you don't see big tire 4x4's driving down the road(big as in 40" +)
    Think about it !
     
  9. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    HA[​IMG] me think. lol thats a good one.[​IMG]
     
  10. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    oh i completly forgot about that.
     
  11. michaelm

    michaelm 1/2 ton status

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    d70s came in late 80s early 90s 3/4 ton dodges
     
  12. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    My and my friend found a Dana 70 HD out of a 98 Dodge 3/4 ton Diesel. It fit under his 87 Bronco without a problem. We had to move the shock mounts and spring perches, but the width was PERFECT. It's now re-geared 4.88 with an ARB on 42" TSL Swampers. Runs great and is unbreakable. There were several Dana 70's, so lockers are different. This one was an HD which has a little more metal on the case.

    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
     
  13. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Doh! I knew that. I guess I just had my GM tunnel vision getting out of hand. [​IMG] Thanks for the wake up!

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     

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