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D-60 vs. 14 bolt Rearend

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KING K5, Oct 27, 2000.

  1. KING K5

    KING K5 1/2 ton status

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    I was just wondering what the strength differences between these two rearends were and any other important differences there are between them that you can tell me, ie. gear options, #lugs etc, etc.
    Thanks in advance!

    Jeff (KING K5)
     
  2. 90K5

    90K5 1/2 ton status

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    The 14 FF is stronger than the 60. they both have 8 lugs and I think that 14s can go to 5.13 gears but I'm not sure. Thge 60 will also be a lot more expensive than a 14.

    90K5
     
  3. ken

    ken 1/2 ton status

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    Dana 60 comes stock with 30 spline 1 5/16" axles. 14 bolt FF comes stock with 30 spline 1 1/2" axles. Lowest gear for a 14 bolt is 5.13. Lowest for a 60 is 7.17. 14 bolts are dime-a-dozen and most of them are a direct bolt in in a GM truck. Not necessarily so with a 60. Also, Detroit Lockers for 60s are over $500, whereas DLs for 14 bolt FF are around $300. Ring gear diameter on a 60 is 9.75", and a 14 is 10.5".

    ken
     
  4. BUDDY

    BUDDY 1/2 ton status

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    This will pretty much sum it up:

    ring: D60=9.5 splines: 30 or 35 axle dia.: 1.31 or 1.5
    D70=10.5 23 or 35 1.5
    14FF=10.5 35 1.5

    The D60 came in all makes of domestic trucks and some Dodge musclecars in the 60's and 70's. It also has 30 or 35 spline axles and there are many different bolt patterns that it was available with. Semi-floater or full-floater. You can get any kind of locker or spool you want for it. They can be made as indestructible as you'd ever need, and parts are plentiful and relatively cheap.

    The dana 70 looks the same from the outside, but the ring is 10.5". It came with 23 or 35 spline axles and they were made full-floating with 8 on 6.5 inch wheel patterns. There are also a lot of available parts for this axle as well, but they're not as cheap as the D60's stuff is. This is probably the best deal in heavy-duty axles out there right now because you can pick one off of an old dodge van and walk out with it for 100.00 from the junkyard complete.

    The 14FF is a huge axle that only comes in chevy 3/4 and 1 ton trucks and vans from the mid-70's to present. Parts are only available from GM and their expensive. The diff. hangs down farther so you lose about 1-1.5" of clearance. Junkyards know about these axles so you'd be lucky to get a complete one for less than 350-400 bucks. Detroit has the only locker for it. BUT, drop in the detroit and it's done. They come from the factory ready to handle whatever you can throw at them. I've never heard of one breaking.

    It's really a matter of preference. Go with what you can find or want and build it up accordingly. Personally, I'm going to see if I can find a D70 (cheap) somewhere and slowly go through it (cheap) until it's set up exactly how I want it and swap it and a D60 front into my blazer at the same time, with ARB's and discs all-around. Then I won't have to ever worry about them again.

    HTH,

    Buddy

    I've got my dream truck and it's a 72 K-5 that is getting there!!
     
  5. KING K5

    KING K5 1/2 ton status

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    Would a Dana 60 out of a '78 Chevy 3/4 ton be a direct bolt up to my '81 K5 that currently has a 12bolt? I'm assuming it would but is there anything I'd have to modify/change? Also, I'm assuming that the D-60 is a better rear than the 12 bolt right?
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    If it is the stock diff for a 78 Chev 3/4 ton it is more than likely a 14 bolt not a Dana 60. A lot of people make this mistake when they advertise parts for sale (at least here they do [​IMG])

    Rene

    [​IMG]
     
  7. KING K5

    KING K5 1/2 ton status

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    Don't know, I haven't seen it but am going to look at it this weekend and I'll find out which it is. It's free so I'll take it either way!!
    Thanks and I'll let you all know!!

    Jeff (KING K5)
     
  8. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Around here, 14 bolt full-floaters are really common and relatively cheap ($200-$300). The big advantage is that they are basically a bolt-in, while a Dana 60 would require the spring and shock mounts to be moved at the least. Also, the most common rear Dana 60's have the 30 spline shafts, which are fairly strong but can be broken, and I have never heard about anyone breaking a 14 bolt axle shaft.
     
  9. KING K5

    KING K5 1/2 ton status

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    That D60 fell through so I won't be upgrading quite yet, I think when I do, I'll go with the 14bolt ff. Even though I'll lose a little clearance, it sounds like I can't go wrong with it!
    Thanks for your help!
    Jeff (KING K5)
     

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