a body rear end ? 8 3/4 vs dana 60

Discussion in 'Mopar Performance Issues' started by flathead31coupe, Sep 4, 2014.

  1. flathead31coupe

    flathead31coupe Well-Known Member

    Messages:
    414
    Likes Received:
    13
    Joined:
    Aug 1, 2010
    Location:
    indianapolis indiana
    View My Photos
    Local Time:
    9:02 PM
    wanting to know if the 8 3/4 weight difference vs the dana 60 dead weight on the axle to help with traction is worth one over the other.....
     
  2. rumblefish360

    rumblefish360 so close yet so far away

    Messages:
    30,758
    Likes Received:
    3330
    Joined:
    Jun 21, 2005
    Location:
    New York, on a Island
    View My Photos
    Local Time:
    10:02 PM
    Near zero. That's because the weight of the DANA is heavier, but traction issues will not be solved by a heavier rear end. You will need to look into the suspension of the car, the whole suspension.

    The cars weight, tire size, etc... All come into play.

    Perhaps, if you tell us all about the car, perhaps someone has been there and some that with the same or very similar set up! There's a lot of A body MoPar racers and hot street car set ups here. Someone is bound to know!
     
  3. 1968FormulaS340

    1968FormulaS340 Well-Known Member

    Messages:
    11,567
    Likes Received:
    450
    Joined:
    Aug 24, 2005
    Location:
    St. Helens Oregon
    Local Time:
    7:02 PM
    No
     
  4. Joe Dokes

    Joe Dokes Well-Known Member

    Messages:
    1,131
    Likes Received:
    98
    Joined:
    Apr 21, 2011
    Location:
    Long Beach Ca
    Local Time:
    7:02 PM
    The 8 3/4 is a more efficient rear-end, it also has the advantage of the gears being held in a carrier that bolts to the housing, thus making swapping pumpkins 'relatively' easy.

    Long story short, the 8 3/4 is an excellent rear end that will take quite a bit of punishment. They are becoming a bit harder to find and as a result becoming a bit more expensive. That being said, if your car is small block and you don't plan on running slicks the 8 3/4 will serve you well. If you run a high torque, high weight car, and throw slicks into the equation than a Dana 60 would be a better choice.

    Here's a good article over at Bigblockdart that runs down the variations on the 8 3/4

    http://www.bigblockdart.com/techpages/875axle.shtml

    The Dana 60 uses a 9.75" ring gear. Can be built with 40 Spline Axles, has gear ratios from 3.55 to 7.13 available. Has a multitude of Lockers, spools, and limited slip differential available. Has 3.25" Axle tubes. In short the Dana 60 is the strongest rear axle commonly available for a passenger car.

    The only downside is weight penalty. Depending upon A LOT of factors the weight difference can be as little a ZERO and as much as 60. Hint the only way your going to get the weight difference to zero is by buying a lot of expensive parts, like an aluminum spool, gun drilled axles, light weight brakes, etc.

    The extra weight won't help you much on traction since it is unsprung weight.

    Regards,

    Joe Dokes
     
  5. 70aarcuda

    70aarcuda Master Hoader of SBM FABO Gold Member

    Messages:
    13,248
    Likes Received:
    1302
    Joined:
    Jan 16, 2005
    Location:
    las vegas
    View My Photos
    Local Time:
    7:02 PM
    the 8 3/4 is not a very efficient rear end due to the placement of the ring gear so low on the pinion gear...the dana 60 is much more efficient rear end...and the 9 inch furd is less efficient then the 8 3/4

    swapped out a 8 3/4 for a strange dana 60....has not slowed the car down one bit..fact given the weather conditions I think the car is running faster with no other changes..
     
  6. flathead31coupe

    flathead31coupe Well-Known Member

    Messages:
    414
    Likes Received:
    13
    Joined:
    Aug 1, 2010
    Location:
    indianapolis indiana
    View My Photos
    Local Time:
    9:02 PM
    thanks for the great replys.. my 66 dart will have a mild built 440 and will also be using a straight axel, 60s gasser style.. it will be driven on the street as well as playing alittle..
     
  7. flyfish

    flyfish C8H18+N2O = :-D

    Messages:
    1,579
    Likes Received:
    74
    Joined:
    Apr 16, 2007
    Location:
    Indy
    View My Photos
    Local Time:
    8:02 PM
    If it is a mild 440 then you are probably safe with either rear, but if you are starting from scratch I would just start with a dana and not have to worry about upgrading down the road if you get bit by the "more power" bug.
     
  8. oldkimmer

    oldkimmer Well-Known Member

    Messages:
    8,886
    Likes Received:
    599
    Joined:
    Nov 11, 2006
    Location:
    Kindersley, Saskatchewan,
    Local Time:
    9:02 PM
    ..................25 years ago we put a dana 60 into a 69 coronet that was running an 8.75.....the car actually picked up almost a 1/10 in the .25 kim.........
     
  9. Old Man Mopar

    Old Man Mopar Righteous Dude

    Messages:
    3,120
    Likes Received:
    344
    Joined:
    Nov 21, 2009
    Location:
    NW Ohio
    Local Time:
    9:02 PM
    It would be important to know if you are using a Torqueflite or a manual trans.

    Chrysler put Dana 60's in 440, 440 6-Bbl and Hemi cars with 4-speeds including
    the original '68 SS/B (then) Darts and Barracudas. Automatic cars got the 8-3/4.
     
  10. NodakDuster

    NodakDuster Well-Known Member

    Messages:
    251
    Likes Received:
    15
    Joined:
    Aug 11, 2014
    Location:
    Bismarck, ND
    Local Time:
    9:02 PM
    I am going through this process right now in my 73 Duster. I have a 400 I am going to stroke (not sure how large yet) backed by a 4 speed. I settled on Dana 60 so I have the ability to build the engine a much as I want.
     
  11. ssba

    ssba Well-Known Member

    Messages:
    2,294
    Likes Received:
    337
    Joined:
    Dec 29, 2009
    Location:
    rensselaer in
    Local Time:
    9:02 PM
    I have never broke a Dana 60 yet using spools and/or power loc with 35 spline axles.
    I have broke three 8 3/4 before I quit
    using them 30 years ago. You do not have to have
    slicks to break a 8 3/4. A mild 440 on
    the street can do them in.
    They are getting expensive so it is a shame to take the chance
    and ruin one that could be used in a car that it won't be at risk.
    Others here have had better luck than I with the 8 3/4 but this has been my experience with them. Not much fun
    when a pinion twist in two or a shur grip cracks up.
    Years ago when I was breaking them they were cheap
    and easy to find. If your careful you can build a Dana cheaper today than what I've seen A-body 8 3/4s sell for.
     
  12. 72BBSwinger

    72BBSwinger Well-Known Member

    Messages:
    2,046
    Likes Received:
    49
    Joined:
    Feb 23, 2011
    Location:
    nebraska
    Local Time:
    9:02 PM
    Using a Strange S-60 housing I bet those are lighter than a converted truck housing, probably by quite a bit.
     
  13. perfacar

    perfacar Well-Known Member

    Messages:
    980
    Likes Received:
    157
    Joined:
    Mar 1, 2006
    Location:
    renton,wa
    Local Time:
    7:02 PM
    hi, a dana 60 from a 1967 to 1972 ford 1/2 ton pickup is the lightest dana. there is only 32 # difference in weight. it has passenger car ends on it. simple to swap ends to mopar, add 8 3/4 axles and brakes. change front yoke to dana 1350, they are way cheaper vs truck dana's .
     
  14. famous bob

    famous bob mopar misfit

    Messages:
    8,800
    Likes Received:
    1762
    Joined:
    Aug 14, 2011
    Location:
    okla
    Local Time:
    9:02 PM
    dana 60 is more efficient. and if you start blowing an 8 3/4 every other weekend, you`ll wish you`d done it right off the bat. if you run single leaf springs-like cal tracs use, that will make up the diff. in weight.-just my 2 cents
     
  15. oldkimmer

    oldkimmer Well-Known Member

    Messages:
    8,886
    Likes Received:
    599
    Joined:
    Nov 11, 2006
    Location:
    Kindersley, Saskatchewan,
    Local Time:
    9:02 PM
    ...........Any I;ve seen were dana 44s............kim.........
     
    • Like Like x 1
    • Agree Agree x 1
    • madscientist

      madscientist Banned

      Messages:
      167
      Likes Received:
      3
      Joined:
      Sep 29, 2014
      Location:
      Washington
      Local Time:
      7:02 PM
      All straight facts. Good post.

      Only thing I will add is the 9" weighs exactly the same as a Dana 60 when the 9" housing is braced and all the internal components are upgraded to compete with the Dana.
       
    • mopar3401987

      mopar3401987 Well-Known Member

      Messages:
      58
      Likes Received:
      0
      Joined:
      Jan 1, 2015
      Location:
      san diego
      Local Time:
      9:02 PM
      I have 440 With aluminium heads with some m&h tires in the back ran low 12s with a 8 3/4 (489) with no crush sleave never had a issue breaking it over 20 passes with it. A friend of mine has a 70 cuda with crate 426 hemi with a 8 3/4 and he has never broke his either. I would imagine some old rear end may have issue's or with 741 case but if you have a fresh rebuild on a 8 3/4 with the crush sleave delete from doctor diff. You will be fine !
       
    • famous bob

      famous bob mopar misfit

      Messages:
      8,800
      Likes Received:
      1762
      Joined:
      Aug 14, 2011
      Location:
      okla
      Local Time:
      9:02 PM
      first thing wrong w/ this post is, "M-H" !
       
    • mopar3401987

      mopar3401987 Well-Known Member

      Messages:
      58
      Likes Received:
      0
      Joined:
      Jan 1, 2015
      Location:
      san diego
      Local Time:
      9:02 PM
      Yea there only 255s on 15 in rims but there a lot better then the bf goodwrench tires I had
       
    • stroked340

      stroked340 Well-Known Member

      Messages:
      4,654
      Likes Received:
      958
      Joined:
      Jun 14, 2014
      Location:
      mass.
      Local Time:
      10:02 PM
      Weight difference is 50 lbs from what i've seen..8 3/4 is just fine for most builds guys running in the 9's no problem,,as for the dana being so "bulletproof"..NOT have seen more then a few "grenade" at the track..
       
    • 72bluNblu

      72bluNblu FABO Gold Member FABO Gold Member

      Messages:
      8,147
      Likes Received:
      2172
      Joined:
      Nov 28, 2008
      Location:
      NorCal
      Local Time:
      7:02 PM
      '67 was the last year for D44's in the rear on the Ford trucks. After that it was Ford 9, D60, or bigger (on the heavy duty trucks).

      The '68+ 3/4 ton trucks had full floating axles, but most of them were 30 spline just like the 8 3/4's. I've seen a couple of Ford truck D60's converted for Mopars. You cut the Ford full floating housing ends off, set the tubes up to be the right length so you end up with axles the same length as the 8 3/4's were, and weld on Mopar car housing ends. Obviously you would need a jig to keep everything straight and aligned, but if you have that (or access to one) you can convert a truck D60 over pretty easily. Especially for an A-body, because the it's a narrower rear. For the E-bodies you have to be pretty careful otherwise they end up too short after you cut the Ford housing ends off. Or, of course, you could always just buy custom length axles. The gentleman I quoted below just cut down the D60 and reused his 8 3/4 axles, and had less than $300 into the swap. I can still get truck D60's out of the wrecking yards here for about $170.

      The truck housings don't have pinion snubbers, but there are ways around that too.

      This post (from another site) shows some of the details of how to do it...

      http://www.cuda-challenger.com/cc/index.php?topic=79213.15


       
    • MuuMuu101

      MuuMuu101 Well-Known Member

      Messages:
      1,663
      Likes Received:
      114
      Joined:
      Jul 6, 2012
      Location:
      SoCal
      View My Photos
      Local Time:
      7:02 PM
      For the amount of money I spent rebuilding my 8 3/4 using all new parts from Doctor Diff, I could have just purchased a new Dana 60 from him pre-assembled.
       
    • 69MOPE

      69MOPE Well-Known Member

      Messages:
      1,745
      Likes Received:
      66
      Joined:
      Jul 12, 2011
      Location:
      Ridley Park, Pa.
      Local Time:
      10:02 PM
      I build rears and Dana 60's are less $ to build!
       
    • fishmens67

      fishmens67 Well-Known Member

      Messages:
      5,286
      Likes Received:
      1188
      Joined:
      Nov 10, 2012
      Location:
      idaho
      Local Time:
      9:02 PM
      I don't know what you paid out. but I rebuilt my 8 3/4 this past winter, all new parts from center to drums, except axles. I just ordered a strange 1350 driveshaft to mate with the new 1350 yoke and I still have money to burn, before I reach the price of a dana 60 from Cass.
       
    • roccodart440

      roccodart440 Well-Known Member

      Messages:
      4,551
      Likes Received:
      3578
      Joined:
      Apr 19, 2010
      Local Time:
      10:02 PM
      exactly and when you get the dana cut to the CORRECT dimension for your A-body (narrower than stock) the weight is barely any different.