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  1. #1
    RC Competitor
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    Twisted stock driveshafts

    5 mins into my new/first 6s batts and HR double slipper both rears literally twisted like a soda straw. I knew running 6s would break more, just didn't expect it so fast. So the question is what do I replace them with, traxxas steal cvt, or summit? I've search, but its not quite clear to me what would better for my setup, and just general bashing. Will either of these not twist under the torque of 6s? Slipper is backed off 1/4 turn.

  2. #2
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    I have never used 6s, but I have used 4s with Summit Long Shafts for about a year. If you do use Summit's, put the blue boot on the diff, it will help to keep them intact longer.
    Slash MT, 1/10 Summit.

  3. #3
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    I would use them, but I can't see a thin piece of rubber helping structurally. More to keep dirt out.

  4. #4
    RC Turnbuckle Jr. 87 GN's Avatar
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    have read of the steel's getting bent in a bad crash, I would go CVD shafts....
    Would you go flip my truck back over??

  5. #5
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    The CVDs are steel, so what are you saying?

  6. #6
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    Quote Originally Posted by Hughesne View Post
    I would use them, but I can't see a thin piece of rubber helping structurally. More to keep dirt out.
    He means that having the blue rubber boot closer to the diff will mean the shaft will be around the other way. Nothing to do with the blue boot adding strength or anything


    Bash it like someone else has to fix it!

  7. #7
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    Yeah the steel CVD's can bend - I have bent about 5 of them in 6 months. Mainly because I run rpm arms which flex and I land heavily doing double back & front flips


    Bash it like someone else has to fix it!

  8. #8
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    i have used the summits for over a year now and have only broken 1 and that was my fault.just make sure every once and a while lube the ends up so they move freely.i use wd-40 to clean them out and it also lubes them.

  9. #9
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    Can't wait to mount the lst2/xxl axles to see how they do. Only thing i'm afraid of is them popping out of the cups. But i don't have rpm arms yet, so i should be ok i think.

  10. #10
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    What's involved in mounting LST2 XXL axles? Straight swap? Or modifications required?

    Do you need to use the drive cups that come with the diff instead of the modified ones?
    Last edited by byrnieman; 05-16-2013 at 08:17 AM.

  11. #11
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    You can use the outdrive cups of the lst2/xxl diffs but you need to do quite some modding on the steering knuckles to accept the larger bearings and get the correct spacing so that your axles don't pop out. Soon more in my build thread .

  12. #12
    RC Racer
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    Thought it sounded too good...

    How good would it be if you could buy a bulkhead that fit an LST2 XXL diff, plus centre and axle driveshafts that just fit.

    Or god forbid...Traxxas make a diff that doesn't come in a package marked FRAGILE for their $800 car.

    I'm a dreamer... I know

  13. #13
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    Some of the best mods can't be bought, only hand crafted.

  14. #14
    RC Turnbuckle Jr. MITCH316's Avatar
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    Quote Originally Posted by BL-Bob View Post
    Some of the best mods can't be bought, only hand crafted.
    I totally agree .
    Rock n Rolla !

  15. #15
    RC Turnbuckle Jr. 87 GN's Avatar
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    Quote Originally Posted by 87 GN View Post
    have read of the steel's getting bent in a bad crash, I would go CVD shafts....
    Quote Originally Posted by Hughesne View Post
    The CVDs are steel, so what are you saying?

    Summit CVD
    Would you go flip my truck back over??

  16. #16
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    i also have the same problem with twisting driveshafts. traxxas told me that the steel driveshafts weren't really a gain because you will just break something else in the diff or trans. told me to keep running the stock ones and change my driving style. the only time I broke them was when i jumped and landed while still one the throttle. now I land just lightly on the throttle and have no problem.

  17. #17
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    Any problems with running the Summit CVD with the RPM TruTrack arms?

  18. #18
    RC Turnbuckle Jr. 87 GN's Avatar
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    nope................^
    Would you go flip my truck back over??

  19. #19
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    I just bought the steel cvds on by second run of 6 s I snapped the dogbone doing a back flip I'm about to purchase the summit
    Ones because they are cheaper and more durable in my opinion

  20. #20
    RC Champion
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    Loosen your slipper some.
    Xerun 150A 2200kv ERBE
    Dewalt 14.4v Summit

  21. #21
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    u can also turn your punch down
    I think mine was either 40% or 60%
    just makes the initial burst of power down abit so your not instantly smashing the axles or diffs
    I had std diffs last me for a year with low punch setting

  22. #22
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    I got my CVDs today, was just installing them. Does everyone put the boot nearest the diff?

    Also, I have a Tekin RX8 esc, and the throttle set as linear. Maybe I'll back it off to setting 2.

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