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  1. #1
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    want the new proline transmission with the rpm bumper mount? I have your solution!

    Hey guys, ive been tinkering around a little bit, and i found a pretty good way to mock up the RPM bumper mount the the Proline transmission. I originally posted this on the rcshortcourse forums, and i felt you guys would like to see this too.

    Lenman73, that is the exact reason i race my slash. I love the sound when the announcer says a traxxas (insert name here) is beating them.
    Back on topic, guys, i have some wonderful news.
    I was messing around with the transmission i just received from tower hobbies, and i think i found a pretty good way to mount up the rpm bumper mount! so far there is one semi-weak spot, but it can be fixed. This is the first mock up, so some screws need to be shorter, and a little finessing it will be needed. So far, its looking good!
    Sorry if the quality isnt to good, im using an ipod touch for the pictures. Sometime later i will get my 16 mp camera for more detail.



    The little link you see there is actually just a slash 4x4 sway bar link.



    If you might ask, "thecoolman101, why isnt that link straight?" well, if you look on the side of the transmission, there is a little round peice that bulges out, for the inside bearing to fit. Well, unless i do some trimming to the link or the transmisson, the link will not go far down enough. another solution is the bend the link, but ill try trimming the end first.
    This is what i mean-



    This is whats getting in the way-



    You can easily see how i mounted one end of the link to the bumper mount but its not easy to see how the other end is mounted. That consists of a longer screw, 3 of the 4 small washers the proline kit comes with, and the ball end has one of the bump steer balls in it to have the depth of the countersinking dealt with.

    another view-



    When mounting the bumper mount, There are two very long screws comming with the kit. I am using these in the exact way as a regular traxxas mount. One difference is the small spacer for the gap when mounting it to the transmission. I used one of the small washers to get a little more of the gap filled, as it wouldnt mount straight.

    These are the screws and spacers im talking about-



    bottom, using the long screws-




    That is essentially how i mocked up the rpm bumper mount. Please tell me if you have any questions, or improvements you think can be made.

    Also, if you are wondering, The chassis im using is a thunder tech racing "outlaw" that had the sides cut down.
    if you want me to i can break your truck for free!

  2. #2
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    Well, made some more progress.
    Does your transmission have friction when you tighten down the screws on the motorplate/ transmission? I had ANOTHER fix for you!
    on the topshaft, there is a black spacer on the spur gear side. That spacer is just a hair to big. Take a file, and grind it down a little. Grind down a little at a time, untill you can tighten down your transmission to the tightness you like, and there will be no more friction!

    Quote Originally Posted by rustlersvxl4life View Post
    pretty innovative dude, keep up the good work
    Thanks, will do!

    Big problem guys, i broke the plastic trans case. Ill post pics momentarily.

    well, yes the trans case broke, but its fixed and better than ever.
    here is both halfs of the cracked trans case.





    here is what i did to fix it.



    The epoxy that is on the surface is removed, but the epoxy inside the crack completely fixed the crack on both halves.



    removed epoxy-



    put in the traxxas steel idler-



    Now, to fix the issue with the trans case cracking, im not sure if i messed this up myself or it was meant to be this way, but i only had the top two case screws going into the motor plate. There is a third un tapped hole where the bottom screw for the spur gear cover goes. I never ran a spur gear cover on my other transmission, so ill run without one here untill i get some new hardware to put it on.
    What i did is the bottom screw lines up with a case screw on the bottom of the case. I ran a longer screw and a nut through it to secure it. I hopefully fixed this issue, looks good.

    this is the longer screw-



    nut on other side of case-



    If i get a longer screw for the bottom hole i could mount the case.

    Any tips or ideas guys? im trying my best to make this better. I do plan on doing somthing on the bottom of the motorplate/bumper mount to secure it to the chassis so it would get rid of almost all of the possibility of breaking the case again.
    Last edited by cooleocool; 07-27-2012 at 08:22 PM. Reason: post merge
    if you want me to i can break your truck for free!

  3. #3
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    That support you attached to the trans case is the culprit most likely for the case failure. Too much energy forced to that tiny screw when landing or impacting that rear bumper.
    It's too bad Proline overlooked this problem with getting a good rigid bumper mount and an universal one to work with Traxxas and RPM etc......

    Best of luck to you and your efforts to solve that problem

  4. #4
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    Thanks for the comment, but i dont think that was the problem. I have the link on the rear hole, and there was no damage done to it. What i believe has happened is the motor plate hit the ground, (there is a small tab on the bottom) pushing to much force cracking by the rearmost screw, not the screw withthe link on it.
    if you want me to i can break your truck for free!

  5. #5
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    The problem is the entire gearbox is poorly designed. It's lazy execution of lazy engineering. Homebrew-mods to "fix" a $100 aftermarket transmission, combined with necessary inclusion of presumably inferior stock vehicle parts (who would have guessed a steel idler would work better... oh, right, Traxxas did. Years ago.) make for a poor product, plain and simple. And it's a shame. There was no need to "rush" this thing to market-- the Slash has been out for years. If refuse to believe PL spent aany proper amount of time designing this, much less testing it.

  6. #6
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    Hey Doc, I'm told a basher version will be coming out. Supposedly upgradable to it from the current PL trans.
    Slash 2WD, Slash 4WD, T-Rex 250
    It's only money!

  7. #7
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    All they need to do is put in metal gears, change the material the toe block and gearbox are made out of, redesign the bumper mount, make the layshaft compatible with a proper range of gears, and they'll be well on their way to making the product they should have released in the first place.

  8. #8
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    Make it a bit more like an FLM?
    Slash 2WD, Slash 4WD, T-Rex 250
    It's only money!

  9. #9
    RC Turnbuckle Jr. rag6's Avatar
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    What about using a threaded link(red outline) with brake tubing(green outline) using 2 bolts on the end(blue outline). the way crawler guys make custom links? Its still gonna be a little flimsy, but should be more solid than what you have now...
    Ya can't polish fertilizer...

  10. #10
    RC Turnbuckle Jr. harry697's Avatar
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    Quote Originally Posted by Dr. Isotope View Post
    The problem is the entire gearbox is poorly designed. It's lazy execution of lazy engineering. Homebrew-mods to "fix" a $100 aftermarket transmission, combined with necessary inclusion of presumably inferior stock vehicle parts (who would have guessed a steel idler would work better... oh, right, Traxxas did. Years ago.) make for a poor product, plain and simple. And it's a shame. There was no need to "rush" this thing to market-- the Slash has been out for years. If refuse to believe PL spent aany proper amount of time designing this, much less testing it.


    Quote Originally Posted by Dr. Isotope View Post
    All they need to do is put in metal gears, change the material the toe block and gearbox are made out of, redesign the bumper mount, make the layshaft compatible with a proper range of gears, and they'll be well on their way to making the product they should have released in the first place.

    It's a real shame, but this is all too true. There is no way this thing was thoroughly tested before release and PL didn't have any issue. Pretty much every thread I've seen where someone has bought this trans has an issue (if not multiple issues) within the first week, sometimes sooner.

    This entire transmission is basically a carbon copy of the original Traxxas Magnum trans from back in the early 90's. I like the aluminum motor plate and separate arm mount/ toe block, but why plastic gear? Traxxas figured out a long time ago that the plastic gears in the Magnum trans (especially the idler, hence the aluminum idler that's been available for years and years) were weak. Why would PL think that copying this setup would work any better today with even bigger and better motors and batteries?


    The comment about the toe block material; Are people also having issues with those breaking? Haven't read it yet anywhere, but also wouldn't be the least bit surprised.




    Oh, and I'm willing to bet money that the OP's trans cases broke due to that link connecting the bumper to the top trans bolt. Not the best place for it. Would probably be way stronger if it was mounted to the bulkhead/tower area.
    Last edited by harry697; 07-28-2012 at 09:06 AM.