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Thread: Billet forward and direct drums

  1. #81
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Billet forward and direct drums

    Still interested also, depending on pricing.
    I'm trying to keep 3 transmissions built the same.

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    Wayne H.

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  2. #82
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    Re: Billet forward and direct drums

    I should hopefully know a price here soon. I'm hoping they are $800 range per drum, both drums have to be used since we are using the 904 friction.

  3. #83

    Re: Billet forward and direct drums

    Quote Originally Posted by boots View Post
    I should hopefully know a price here soon. I'm hoping they are $800 range per drum, both drums have to be used since we are using the 904 friction.
    count me in too. any billet ring and pinions laying around.

  4. #84

    Re: Billet forward and direct drums

    Are the drums steel, or aluminum? You guys track test them first; If they don't explode I'm in. and so would be many other racers. Not in any way trying to be a smart a$$. I'm just cautious.
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  5. #85
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    Re: Billet forward and direct drums

    Rob- I currently do not have any gears laying around, my ring and pinion cannot be used with stock transfer gears. So you would have get the transfer gears with ring and pinion. Could you possibly get 3 people interested in a set and I can get a quote. I may even get an extra set.

    Warren-the plan is aluminum for both drums, my only concern is with the forward drum is the input shaft splines. But the 7075 material is stronger than the shitty oem material. I have 100% confidence that the drums will not explode, Iíve already ran one of Brianís aluminum drums for high gear and they use the same drums in the 904. But I do plan to test them before going forward with the rest of the drums. Once I get the test pieces, going to fit everything and then run the car and report back.

  6. #86
    Supporting Member Turbo Mopar Contributor zin's Avatar
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    Re: Billet forward and direct drums

    7050 Al has the same basic strength as mild steel, which is why it's use in proper AN fittings and as the proper material for AR upper and lower receivers.

    It doesn't anodize as nicely (at least not without expensive prep), which is why so many use "aircraft" 6061, which is a bit misleading, it's not a material to be used in a highly stressed area of any aircraft...

    All that to say, "good choice of material". It's a good compromise between ultimate strength and cost (better material isn't going to gain much, but the cost sure would!)

    Mike
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  7. #87
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Billet forward and direct drums

    Quote Originally Posted by zin View Post
    7050 Al has the same basic strength as mild steel, which is why it's use in proper AN fittings and as the proper material for AR upper and lower receivers.

    It doesn't anodize as nicely (at least not without expensive prep), which is why so many use "aircraft" 6061, which is a bit misleading, it's not a material to be used in a highly stressed area of any aircraft...

    All that to say, "good choice of material". It's a good compromise between ultimate strength and cost (better material isn't going to gain much, but the cost sure would!)

    Mike
    Thanks for that Mike.
    I'm anxious to see how this turns out.
    Not anxious to have to come up with funds for 3 transmissions worth of parts!

    If we miss out on the initial offering of these, how many units would be needed for another batch?
    Already thinking too far ahead, sorry!

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    Wayne H.

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  8. #88
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    Re: Billet forward and direct drums

    The thing you're paying for with true aerospace quality materials is the certifications (the stack of papers) saying that the raw materials and methods used to make the end product are approved to be used on an aircraft. There are *NO* inherent advantages to paying more for "aerospace grade" unless you absolutely *need* it.

    I would figure a tougher material with a high surface hardening would be preferred. A 6000 or 7000 series (as has been chosen) with a T6 hardening and maybe a DLC coating on the splines.

  9. #89
    Supporting Member Turbo Mopar Contributor zin's Avatar
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    Re: Billet forward and direct drums

    Just to be clear, the certifications that trace the manufacturing process (from ore, to the heat the material was made from), don't have a bearing on the actual grade of the material (7075 vs 6061, etc), the chemistry, heat treat, etc. are what determine the grade.

    For some industries, aerospace being one, often a requirement will be that the material used be from a US source, which the cert will document, as well as ensure the material actually IS what it is supposed to be.

    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

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  10. #90
    Supporting Member Turbo Mopar Contributor Ondonti's Avatar
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    Re: Billet forward and direct drums

    Already been in for ring/pinion/transfers but been all silence after I was informed the Drums were going forward.


    I saw today that DSM guys have a serious planetary problem (slow high torque cars can kill them) but they also run mid 7's inconsistently. They currently have no fix. I find it awesome to get any good parts for our transmissions, or see we might have more potential than another transmission.
    Brent
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  11. #91
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    Re: Billet forward and direct drums

    Zin- yea clearly when comparing 7075 aluminum to a better alloy steel the steel is going to win. But Iím comparing to the oem cast steel drums. Comparing the tensile strength of cast steel to the 7075, the 7075 should hold up just fine. We would save money actually going to say 4041 steel the aluminum is more $$$

  12. #92
    Supporting Member Turbo Mopar Contributor zin's Avatar
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    Re: Billet forward and direct drums

    Quote Originally Posted by boots View Post
    Zin- yea clearly when comparing 7075 aluminum to a better alloy steel the steel is going to win. But Iím comparing to the oem cast steel drums. Comparing the tensile strength of cast steel to the 7075, the 7075 should hold up just fine. We would save money actually going to say 4041 steel the aluminum is more $$$
    I agree, 7075 is a good choice, and since the part is restricted in its dimensions so as to fit in the same place, a stronger, yet lighter material is a great choice.

    More strength, less rotational mass, a win-win. As for the steel option, sure, it's going to be stronger, but it would also be heavier, and is that added strength even a benefit at this point, other parts will likely prove to be the "weak link in the chain" before this piece.

    So, I concur with the choice of materials.

    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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  13. #93
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    Re: Billet forward and direct drums

    After test fitting and testing the drums, Iím going to look into hard coating the pieces. Once these are done, Iím hoping to have the upgraded sprag batch done using 12 rollers instead of 8. Next thing would be straight cut planets.

  14. #94
    Supporting Member Turbo Mopar Contributor Ondonti's Avatar
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    Re: Billet forward and direct drums

    Quote Originally Posted by boots View Post
    After test fitting and testing the drums, Iím going to look into hard coating the pieces. Once these are done, Iím hoping to have the upgraded sprag batch done using 12 rollers instead of 8. Next thing would be straight cut planets.
    DSM world doesn't even have straight cut planets and they kill theirs in 5-6 passes in the fastest cars. Jeff Bush sold his record setting auto AWD car to go RWD.
    Brent
    GREAT DEPRESSION RACING
    1992 Duster 3.0 The Junkyard- Now - Megasquirt II/Extra. OEM 10:1 3.0 + funny business
    - Old - 11.5@125 22psi $90 Stock 3.0 Junk Motor - 516whp 519wtq 20psi 91 oct built 3.0 stock n/a computer
    1994 Spirit 3.0 - 12.3@113 15 psi - Daily Holset He341 280whp 304ft/lb @10psi
    1994 Spirit 3.0 a670 - Wife's - Disassembled
    1990 Spirit 3.0 E.S. 41TE
    1993 Spirit 3.0 E.S. 41TE
    1994 Duster 3.0 A543
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  15. #95
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    Re: Billet forward and direct drums

    Iíve been half tempted to just swap full dsm drivetrain in. But itís still going to need developed some.

  16. #96
    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
    Iíve been half tempted to just swap full dsm drivetrain in. But itís still going to need developed some.
    Thinking seriously about doing that with the Charger.......awd.....

  17. #97
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    Re: Billet forward and direct drums

    Well the hosting site I normally use is down. Anyone suggest a site? I have picture of the billet forward drum in my hands finally

  18. #98
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Billet forward and direct drums

    Posting for boots:


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    Wayne H.

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  19. #99
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    Re: Billet forward and direct drums

    That is SEXAH!!!

  20. #100
    Supporting Member Turbo Mopar Contributor zin's Avatar
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    Re: Billet forward and direct drums

    Are they going to be hard anodized for added durability?...

    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.
    - Edmund Burke

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