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Thread: Billet forward and direct drums

  1. #61
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    Re: Billet forward and direct drums

    That is my plan, racing at Cecil dragway in Maryland 15/16. If we donít break anything should be at 42.

  2. #62
    Supporting Member Turbo Mopar Contributor zin's Avatar
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    Re: Billet forward and direct drums

    Quote Originally Posted by A.J. View Post
    Since I stopped welding braces in the case I haven't had any case issues. I'm breaking internals. I'm putting out 395 HP, 450 ft/lbs torque in a 3600 lb van.
    That's encouraging, it has been my experience that tolerance "stack-up" and sloppy fitment tends to make stuff break that otherwise could survive.

    On the braces, I'm guessing there wasn't any post-welding heat treatment done? I can see the welding introducing stress and distortion that could make you go one step forward and two back...

    Mike
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  3. #63
    Supporting Member Turbo Mopar Contributor A.J.'s Avatar
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    Re: Billet forward and direct drums

    Quote Originally Posted by zin View Post
    That's encouraging, it has been my experience that tolerance "stack-up" and sloppy fitment tends to make stuff break that otherwise could survive.

    On the braces, I'm guessing there wasn't any post-welding heat treatment done? I can see the welding introducing stress and distortion that could make you go one step forward and two back...

    Mike
    No post welding heat treatment was done.

  4. #64
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    Re: Billet forward and direct drums

    Quote Originally Posted by A.J. View Post
    No post welding heat treatment was done.
    This is where I think problems with this method actually stem from. Not the bracing, but the fact that the case really should go through a re-heat-treatment to get rid of the internal stresses caused by the welding.

  5. #65
    Supporting Member Turbo Mopar Contributor zin's Avatar
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    Re: Billet forward and direct drums

    Quote Originally Posted by Reaper1 View Post
    This is where I think problems with this method actually stem from. Not the bracing, but the fact that the case really should go through a re-heat-treatment to get rid of the internal stresses caused by the welding.
    I don't know if re-treating would throw off dimensions or not?... I'm also curious as to whether or not "cryo-treatment" might do the trick while not altering the toleances... would either benefit from having critical parts installed during? Thinking along the lines of a torque plate...

    OK! Who's got some $$ to blow on a cool test project!?

    Mike
    "The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government - lest it come to dominate our lives and interests." - Patrick Henry

    Bad laws are the worst sort of tyranny.
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  6. #66
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    Re: Billet forward and direct drums

    I think going over the welds do help distress things. But I always have to grind and clearance the pinion bore after welding

  7. #67
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    Re: Billet forward and direct drums

    Some more progress, still debating on steel or aluminum.


  8. #68
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    Re: Billet forward and direct drums

    Quote Originally Posted by boots View Post
    Some more progress, still debating on steel or aluminum.

    I didn't know there was an image until I clicked "reply with quote". Are the images working for other people?

    Anyway, because race car, I vote aluminum. One thing I don't know it the wear capacity of aluminum drums vs steel. Obviously steel will absolutely last longer, but we aren't concerned with 200,000 mile warranty periods, we're worried about a few hundred drag passes and maybe 20,000 road miles. The aluminum will also tend to get impressions in it where the clutch discs ride (evidence from stock transmission cases) and depending on the heat treat of the material or any coatings applied this may or may not be an actual issue. Were you looking at doing post machining treatments/coatings?

  9. #69
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Billet forward and direct drums

    I wish i was more knowledgeable about these autos, or any auto trans... but the band is riding on the outside of these drums?
    If so, i vote for steel due to longevity. After this significant investment it would really hurt to have to replace those drums after a shorter time in use.

    But, I'm an oddball, i want a super duper trans for racing, but also like street driving and doing dragweek. So i want a strong part that will last.
    I'm also hoping to continue my plan of having these trans builds in Mini, Slug, and one spare, so that is going to be huge money for someone who doesn't make any money racing!
    Wayne H.

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    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
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  10. #70
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    Re: Billet forward and direct drums

    There more than likely going to be steel since the section where the steels ride is very thin from matching the 904 steels. Up side will be readily available supplies and wider frictions.

  11. #71
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    Re: Billet forward and direct drums

    Hopefully starting on forward drum this Monday and waiting on band material to show up to weld end pieces on them. Once this project is wrapped up moving to 2.45-1.45 front planet sets. Also upgraded sprags should be close to being done being water jet cut.

  12. #72
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    Re: Billet forward and direct drums

    Rob I wont be at IFO, going to street car take over at national trails

  13. #73
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    Re: Billet forward and direct drums

    Here are some more updates, drums coming along nicely. Hoping to test fit in about 2 weeks.





  14. #74
    Supporting Member Turbo Mopar Contributor turbo2point2's Avatar
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    Re: Billet forward and direct drums

    Love it! Awesome work!

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  15. #75
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    Re: Billet forward and direct drums

    Quote Originally Posted by boots View Post
    Here are some more updates, drums coming along nicely. Hoping to test fit in about 2 weeks.




    Why are the images not showing up? I can see they're supposed to be there, but the posts act like there's nothing.

  16. #76
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    Re: Billet forward and direct drums

    I probably posted them wrong lol. I'm pretty excited to see this platform to move forward, my bank account isn't very excited. I'll get some more pictures as we progress.

  17. #77
    Supporting Member Turbo Mopar Contributor rdnoel86's Avatar
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    Re: Billet forward and direct drums

    Quote Originally Posted by boots View Post
    I probably posted them wrong lol. I'm pretty excited to see this platform to move forward, my bank account isn't very excited. I'll get some more pictures as we progress.
    They show up fine.

  18. #78
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    Re: Billet forward and direct drums

    forward drums are still at the spline cutting company, so I have not been able to test fit. If anyone is still interested in these please let me know so I can get a head count.

  19. #79
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    Re: Billet forward and direct drums

    Count me in

    Sent from my SM-N960U using Tapatalk

  20. #80
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    Re: Billet forward and direct drums

    im in too

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