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  1. #1
    RC poster
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    Aug 2013
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    I need help

    I have installed the LST differentials in my 3906
    I have the traxxas CVDS. But one of them are to short.
    What parts do I need.. I know I need drive cups and the rear cenrer driveshaft...
    II'm sick of it sitting in the garage and not running. It has two titan 550s

    Some please help.
    If I need to post pictures let me know I will..


    I actually own the LST so I have all the parts from it
    I will be parting the lst parts as soon as I get this emaxx running..

    Please help


    Part numbers links ??
    Last edited by cooleocool; 08-26-2013 at 09:33 AM. Reason: merge

  2. #2
    RC Turnbuckle Jr. Wildman4910's Avatar
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    You can always trim the pivot balls so they can be screwed farther into the arm to make up the difference.
    Look out for the tree/crunch!

    LiPo? Naw NITRO!!

  3. #3
    RC Champion
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    How much it short by? Traxxas sells extended drive cups, but I dont know if theyll mate up to the LST diffs. I belive the traxxas one is 5153R, its a revo part, but the new MAxx has the revo driveline.

    This thread should help unless uve already seen it.
    http://traxxas.com/forums/showthread...my-modded-3906
    This parrot is NO MORE!!! This is an ex-parrot!!!

  4. #4
    RC poster
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    Here's where I am stuck at.. what drive cups and drive cups

  5. #5
    RC Competitor
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    My parts for my diffs will be here hopefully sometime this week and I will see if the center cvds work with hyper7 cups. Just in case I ordered these. If I have to use the couplers I'll make some center shafts out of Revo wheel shafts.
    Last edited by Zane_Grey; 09-10-2013 at 02:16 PM. Reason: Link didn't work.

  6. #6
    RC Champion
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    Those and the output extension that was used in the thread i posted a link to above should. That give you about the right extension...

    Please look at the first few posts on that. He shows it pretty much all worked out.
    This parrot is NO MORE!!! This is an ex-parrot!!!

  7. #7

  8. #8
    RC Champion
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    Thats what he used. The second one is for the output (sides of the diff) I belive, so you may not need them if you have the telecoping stock axles. the first one is the drive cup for the input of the diff. that should fix your length issues. He is using Kershaw Dogbones tho, those might b a little different but not by much. Easiest way is to measure the distance from the shaft to the end of the dogbone and then email RC raven and ask to be sure.
    This parrot is NO MORE!!! This is an ex-parrot!!!

  9. #9
    RC poster
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    I have the lst outer axles installed. The ones that goes to the wheels.
    So that drivecup will mount on the LST diff without any mods ??

  10. #10
    RC Competitor
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    The RC Monster 8mm drive cup will fit the pinion but it might not be long enough. The 3906 cvds were meant to be used with the pinion in the stock diff, the pinion was longer. Did you already try one of the drive cups from the lst?

  11. #11
    RC Competitor
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    Got my diff parts today and I will be making center shafts out of Revo wheel shafts using the RC Monster coupler. The Hyper 7 drive cups weren't long enough. If I were you I would measure the distance you need then ask them how long the cups are.

  12. #12
    RC Competitor
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    Well I feel a little bit stupid. I didn't realize that there were different versions of the RC Monster Revo coupler and ordered the wrong one. Just wanted to let you know that the coupler didn't work, I needed the V2 coupler.

  13. #13

  14. #14
    RC Competitor
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    Quote Originally Posted by nburns11 View Post
    Those are for a 6mm pinion, your pinion is 8mm. I got the RC Monster Revo couplers machined to 8mm all the way through and made driveshafts, pics in my thread.

  15. #15
    RC poster
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    Gonna order some Kershaw designs cvds and use RCM 8mm drive cups.
    Which cvds do I need to order from kershaw

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