How To Recondition a Sure Grip Cone

  1. Seansmopar

    Seansmopar Well-Known Member

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    I Purchased an A bodied 8 3/4 741 differential that looks like it was separated from the car and sat in a backyard for years. Taking it apart carefully trying to preserve all bolts and nuts I noticed the pinion matched the pinion of 742 case and then looked at the numbers on the ring gear and shows 2800270 with research says it belongs to a 742 case. I'm learning as I go about this unit and visually can tell upon disassembly this is a cone style. I noticed the inside cone gear appears to be beat up on the side that sits in the cone. Question does the gear and the inside of the cone have to be machined as well. I try to rebuild by myself as much as I can...Thanks..Sean
     
  2. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    A picture would be helpful here.
     
  3. Seansmopar

    Seansmopar Well-Known Member

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    Ok I will take some photos tomorrow and post..thanks for replying!
    Sean
     
  4. 340dartley

    340dartley Well-Known Member

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    I have done this exact repair about 20 years ago. I was able to chuck the cones up in my break lathe and shave about. 060 off of them. I reinstalled them and they worked great. I was told this trick by my friends dad who was an old Chrysler line mechanic from the 70s and who also campaigned and worked on several mopar bracket cars. Great thread.
     
  5. Seansmopar

    Seansmopar Well-Known Member

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    Here is the inside of the cones..I will bet the previous owner got them hot.

    [​IMG]

    View attachment image.jpg
     
    Last edited by a moderator: Jul 13, 2016
  6. Seansmopar

    Seansmopar Well-Known Member

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    Last edited by a moderator: Jul 13, 2016
  7. Seansmopar

    Seansmopar Well-Known Member

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  8. Seansmopar

    Seansmopar Well-Known Member

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    741 case with a 742 pinion...I hope I can salvage something with this case..it all turned before I took it apart..and it was no bind or slop..
    Sean

    [​IMG]

    View attachment image.jpg
     
    Last edited by a moderator: Jul 13, 2016
  9. dwhip361

    dwhip361 Well-Known Member

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    Subscribed, great info, thanks guys!
     
  10. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    I wouldn't worry with any of that. You MIGHT go over them with some wet or dry and some mineral spirits but it's not necessary at all.
     
  11. Seansmopar

    Seansmopar Well-Known Member

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    Do you think it all still needs to be shimmed any where?
     
  12. fishy68

    fishy68 Tyr Fryr's Inc. FABO Gold Member

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    That doesn't look like a 742 pinion to me. Looks like a typical 741 pinion with the spacer installed
     
  13. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    I don't know. I would have to see it in person.
     
  14. Seansmopar

    Seansmopar Well-Known Member

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    You have to look closely at the spline.i have found a photo for comparison. And the ring gear shows 2800270 3:23 for 742

    [​IMG]

    View attachment image.jpg
     
    Last edited by a moderator: Jul 13, 2016
  15. carls72dart

    carls72dart FABO Gold Member FABO Gold Member

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    Thank you for an education! I've always wanted to rebuild a center section, now I feel more confident doing so! Thanks Rusty:)
     
  16. badlilred79

    badlilred79 badred360 FABO Gold Member

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    nice work#-o
     
  17. Oldmanmopar

    Oldmanmopar Going left turning right FABO Gold Member

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    This took some time to take all these pictures and share this info. And for no other reason than to help fabo members. Thanks Rusty very good information for all. Steve
     
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    • mguner

      mguner How many is too many?

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      Thanks Rob! You just gave me a great idea with what to do with the old axle stubs from the Dana I converted. Alignment tools! Also maybe make it a fixture for the lathe to hold the cones for turning them off. Might keep one for the D-200....
       
    • Cranky

      Cranky Banned and proud

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      It's not a great pic, but I made these T-bars a lot of years ago. Also use them whenever I find a Sure Grip at a swap meet to check a SG for resistance.

      [​IMG]
      [​IMG]
      [​IMG]
      [​IMG]
       
    • 19DART66

      19DART66 Well-Known Member

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      The only thing different we use to do was to add 727 clutch springs inside the four pre load springs, a little tough on the street on corners but it kepted both wheels locked together at the drag strip.
       
    • mean318

      mean318 Well-Known Member

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      Where does one find spider gears for these units? I have one that needs a set and another that needsgears and shaft. Thanks for the writeup!
       
    • john-9

      john-9 Well-Known Member

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      you can use the cross pin out of an 8-34 open differential -- the spider gears are not available anywhere -- you have to salvage them , if possible , out of another trashed sure grip
       
    • mean318

      mean318 Well-Known Member

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      I was afraid of that. Thanks!
       
    • Fisho

      Fisho Well-Known Member

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      @RustyRatRod I took my cone type sure grip apart today. 2 of the springs are broken, do you happen to know where I could find replacement ones? Thanks!
       
    • RustyRatRod

      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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      I have a few. It is an 8 3/4?
       
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