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Dana 60 or Dana 70 Rear

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TxK5Blazer, Jul 8, 2003.

  1. TxK5Blazer

    TxK5Blazer 1/2 ton status

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    I am buying a set of axles and the guy has both a dana 60 and dana 70 rear which would be better to have on my K5 there is only a $50 difference in the two. need some input I am picking them up this weekend ......Jason
     
  2. txbluethunder

    txbluethunder 1/2 ton status

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    D70. its closer equivalent to the 14bff than the d60 rear is.
     
  3. OL14BLAZ

    OL14BLAZ 1/2 ton status

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    I second the D70 you can also go lower than 5.13 gears if you ever need to to run those bigger tires you will eventually get. /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif


    Eric
     
  4. afroman006

    afroman006 1/2 ton status

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    [ QUOTE ]
    you can also go lower than 5.13 gears

    [/ QUOTE ]
    The 14 bolt FF is the axle that you can only go down to 5.13s on. Dana 60s can have as low gears as dana 70's, I think the lowest I've seen is 7.15 or somethin close to that. But I'd say the price of lockers offsets that. Then again, if you're set on one of those two axles, I'd say go with the D70 because from what I hear, the axle shafts are almost the same size, but the ring gear on a D70 is around 10.5" and the D60 is like 9 3/4". Not a huge difference but hey, every little bit helps right.
     
  5. blasterD

    blasterD 1/2 ton status

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    How many splines are in the Dana 60? Many early Dana 60's have 30 splines and are relatively weak. If the Dana 60 has 35 spline shafts it is very close in strength to the Dana 70. Almost all Dana 70's had 35 spline shafts. One drawback would be weight. I'm not sure how much the difference is but I know the Dana 70 weighs more.
     
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I'd go with the D70 any day since they are more comparable to the 14FF. The D70 has a slightly larger ring gear diameter at 10.54 inches compared to the 14FF at 10.5 inches.

    ALL D70's are 35 splines. The only D60's with 35 splines are the newer axles like in the Dodges. Almost all of the D60's from older trucks have somewhere around 16 splines or so. The axle shaft diameter on the older D60's are also smaller and weaker than the 14 and 70 which are at 1.5" diameter. You can't buy an aftermarket 60 shaft that is 1.5" and 35 spline and stick it into the older 60 housing because the spindle hole is not large enough to let it slide in. There was an article in a magazine where ORU did this boring into a smaller 60 spindle hole with some special bit. Very time consuming a costly, too.

    Stick with the 70 and have fun picking out gear ratios since they are available for the 60 and 70 in gears all the way up to 7.17 ration. /forums/images/graemlins/eek.gif /forums/images/graemlins/eek.gif /forums/images/graemlins/eek.gif /forums/images/graemlins/thumb.gif
     
  7. tarussell

    tarussell 1/2 ton status

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    I will put in a vote for the Dana 70 as well . A "B" series 70 is the most common ( or so it seems ) but becareful if it is from a late model Dodge - they come with odd ball 32 spline axles and a crush sleeve instead of shims for pinion pre-load . HTH , Tom
     
  8. SCOOBYDANNN

    SCOOBYDANNN 1/2 ton status

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    [ QUOTE ]
    But I'd say the price of lockers offsets that

    [/ QUOTE ]

    i don't know if all 70's have it, but a buddy of mine has the HD one and the carrier splits like the 14, so the locker itself was also as cheap as the 14
     
  9. boz42

    boz42 1/2 ton status GMOTM Winner

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    pull the axle shafts on the 70 before u buy!!! if it aint 35 spline u don't want it. some are 32 spline &amp; some are smaller than that. u can't get any lockers for any of them except the 35 spline. there is 3 versions also d70, d70 hd &amp; 70u. all are fine as long as u get a <font color="red"> 35 spline version</font> .
     
  10. RustBuket

    RustBuket 1/2 ton status

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    Go for the beef! Get the 35 spline 70 (if he has one). /forums/images/graemlins/thumb.gif
     
  11. OL14BLAZ

    OL14BLAZ 1/2 ton status

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    [ QUOTE ]
    The 14 bolt FF is the axle that you can only go down to 5.13s on

    [/ QUOTE ]

    Uh yeah I knew that. I meant that if wanted to go lower than 5.13 gear ratio he would want to get the Dana 70.


    Eric
     
  12. afroman006

    afroman006 1/2 ton status

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    Oops my bad. Just went back and re-read it. My mistake.
     
  13. crwln73

    crwln73 1/2 ton status

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    Go with the 70.I run one with 5.86s and love it.
     
  14. prjt_blzr

    prjt_blzr 1/2 ton status

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    The D70 is a great axle. It is usually a little pricey when compared to the 14BFF though and not usually a plug and play deal. You DO want to avoid a 70-3HD axle though. GM thought that it would be great to move the pinion center line on these axles. As a result they are a real odd ball.
    Mike
     
  15. kennyw

    kennyw N9PHW Premium Member

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    [ QUOTE ]
    Almost all of the D60's from older trucks have somewhere around 16 splines or so.

    [/ QUOTE ]
    Only the Ford and Dodge axles have that low spline count problem /forums/images/graemlins/wink.gif From 1960 up GMC was using 30 spline Dana 60's (Chevy was using Eaton's with course splines). Anything 1959 or earlier I am not sure about.

    I am going to use a Dana 60 because it has better ground clearance (due in part to the smaller ring gear) and mine came from GMC with 4.10's and a Power Loc in a 1966 GMC 2wd 3/4 ton. It also has 42.5" spring spacing. For what I plan to use the truck for a Dana 60 is more than strong enough for me. I am using my K10 as a 3/4 ton for towing medium loads and mild offroad driving.
     
  16. m j

    m j 1/2 ton status

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    if you go 70 you can upgrade it to 35spline with dana parts if it does not already come with them.
    I used a dodge70 w 32 splines and stepped up to detroit and 35spline axles.
    the 32 spline with 4.56 and higher gears has a detroit available
     
  17. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    mj, any issues fitting the shaft through the spindle? Or is that just a D60 issue?
     
  18. m j

    m j 1/2 ton status

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    no fitment issues, bolt in
     
  19. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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