Has anyone ever seen these.... (GM rear axles)

Discussion in 'The Garage' started by Emmettology 101, Sep 8, 2004.

  1. Emmettology 101

    Emmettology 101 3/4 ton status Premium Member

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    I was looking through some info on Tractechs(Detroit Lockers) site and they list two axles I have never saw listed before. The application is for a:

    30/3500 Cab Chassis, Motorhome, Bus chassis, Pickup rear

    to '86 they list: GM 11,000# 12" dia ring gear 1.75" axleshafts 27 spline
    86-92 they list: GM 11,000# (Rockwell) 1.70" axleshafts 32 spline

    And then for the 3500HD they list the 91-00 Rockwell C-102(which looks to be the same Rockwell as above. And also a Dana 80 which is 1.60" 37 spline for 92-00.....


    Hmmm.... /forums/images/graemlins/thinking.gif

    Has anyone saw one of the Rockwell axles? Or even a Dana 80 in a GM?
     
  2. tarussell

    tarussell 1/2 ton status

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    Yes . They are the ones with ten lug's in the rear and five lug front hubs (2WD). All of the axles you listed are VERY stout and will support serious weight !
    Tom
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status Premium Member

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    Hmmm.. Learn something new everyday! /forums/images/graemlins/smile.gif Now who's going to be the first to do an 8 lug conversion? /forums/images/graemlins/wink.gif

    Do uses the D80.. But some a re a hybrid of a D80 center with D70 axles.
     
  4. ZooMad75

    ZooMad75 1/2 ton status Premium Member GMOTM Winner

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    these axles are frigging huge. They might carry a lot of wieght, but you will be dragging a giant pumpkin across every thing you run on.

    The Rockwells were used in the P-Chassis (class "a" motorhome strip chassis). Some Dana 80's were used on the P-chassis too.

    Eiether axle would be overkill on a K5 with less than 40" tires thats for sure. But if you got to run the big balones these would take it!
     
  5. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    The D80 was used in the 3500HD GM trucks but never in a 1 ton and lighter IIRC.

    Dodge on the other hand uses the D80 almost exclusively behind the cummins in the pre '03 trucks. /forums/images/graemlins/pimp1.gif

    Ford used the D80 in the 1 ton duallys.
     
  6. atho

    atho 1/2 ton status

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    That first one sounds kind of like one of the old Eaton axles. I looked at my 1969 GMC service manual and there is one listed as a HD option on one ton trucks and step vans. It is called the H110, holds 11k. It is a dropout third axle like the smaller Eatons, except 12.25" ring gear and has the diff cover welded on. No idea on axleshaft info. I saw one of these once in the junkyard by my house, attached to the remnants of a 1970 Chevy 1 ton, but unfortunately it was scrapped a couple years ago. It was 8 lugs and one huge mofo of an axle.
     
  7. 85mudblazin

    85mudblazin 1/2 ton status

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    Here is a blazer with rockwells
    [​IMG]
    [​IMG]
    /forums/images/graemlins/thumb.gif
     
  8. SkulzNBonz

    SkulzNBonz 1/2 ton status

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    MMMMM........Rockwells /forums/images/graemlins/woot.gif /forums/images/graemlins/waytogo.gif


    John
     
  9. ZooMad75

    ZooMad75 1/2 ton status Premium Member GMOTM Winner

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    those Rockwells on that Blazer are 2 1/2 ton's. Rockwell makes other axles too. The 11k axles that he was asking about are different. They have round axle tubes rather than the square ones the 2 1/2 tons do, the pumpkin is not top mounted and no extra pinion drive flange/brake. 10 Lugs too.
     
  10. James670X

    James670X 1/2 ton status

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    When I was looking for an 87-92 1ton single wheel SFA truck last year I was told of an ex-railroad truck that had ten bolt wheels (I'm trying to get pictures of it as I speak). Can anyone give me the specifics on my rear diff (Dana 70HD)?, is it a Dana 70 with Dana 80 peices in it?, what size ring gear should it have?, how many splines on the axles?, etc, etc...
    My truck is a 1988 Chevrolet V30 (SFA, old body style still) dually.
    Thanks,
    James
     
  11. atho

    atho 1/2 ton status

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    The dana 70/80 hybrid you are thinking of is a Dodge only item, it had D70 tubes, shafts, and outers, and a D80 centersection w/ 1 pc carrier.
     
  12. James670X

    James670X 1/2 ton status

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    hmm that's weird because I saw 70HD stamped on the axle tube of it (would it help you out if I took some pictures of it tomorrow?).
     
  13. atho

    atho 1/2 ton status

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    ohh, the 70HD...that uses the D80 pinion bearings, but I don't think it shares any other parts.
     
  14. SkulzNBonz

    SkulzNBonz 1/2 ton status

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    [ QUOTE ]
    those Rockwells on that Blazer are 2 1/2 ton's. Rockwell makes other axles too.

    [/ QUOTE ]
    Why yes they are, and yes they do. You wanna buy some /forums/images/graemlins/woot.gif

    John
     
  15. tarussell

    tarussell 1/2 ton status

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    The GM versions of the Dana 70HD share the same carrier bearings as the Dana 80's but not the pinion bearings ( the Dana 80 small pinion bearing is much larger than the 70 stuff and the inner pinion bearing is similar in size but has a much different pitch on the tappered rollers ) .
    The tubes on the HD 70 are 4" O.D. and IIRC they are 9/16" thick and the Dana 80's in the Dodge/Ford trucks are 4" O.D. and 5/8" thick tubes.
    I learned from U2SLOW that the GM Dana 70 HD shares the same dually hubs as the Dually 14FF and also brakes w/related components.
    The differential from a HD 70 could be used in a Dana 80 if the ring gear bolt holes are bored out to the Dana 80 size.
    HTH's a little , Tom

    P.S. I just re-read your post and I did not answer some of your questions - sorry .
    The HD 70 has a ring gear diameter of 10.54" (Dana 80's are 11.25")
    It should have 1-1/2" 35 spline axles
    The only thing that is a DIRECT interchange with a Dana 80 are the carrier bearings.
     

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