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  1. #1
    RC Competitor
    Join Date
    Apr 2018
    Posts
    69

    TRX-4 Rear wheels not as much power

    Hi everyone, i recently got my TRX-4 and i LOVE it! My setup is:
    - Super Swampers
    - the upgraded Traxxas Servo
    - Castle/MambaX combo
    - flysky radio/receiver
    - replaced all mini servos, all are now functional
    - steel wheels
    - all else stock

    When I'm going up a steep incline with the diffs locked, i've noticed the rear wheels (where most of the stress is) will sop spinning while the front wheels continue to spin. I would like to rear wheels to move so i can get up the incline. What are some possible problems?

    thanks!
    Sparky

  2. #2
    RC Champion RCWilly's Avatar
    Join Date
    Feb 2019
    Location
    California Bay Area
    Posts
    1,028
    It could be a slipping rear central driveshaft. The grub screw holding it may have fallen out making the rear axle slip. Another possibility is a damaged rear diff ring/pinion gear, or rounded rear axle driveshafts, or portal gear damage.
    Everyday's a gift, thus now is called the present.

  3. #3
    RC Competitor
    Join Date
    Apr 2018
    Posts
    69
    ok, i can check those things out. any other thoughts?

  4. #4
    RC Champion
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    Feb 2020
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    Quote Originally Posted by sparkyal View Post
    ok, i can check those things out. any other thoughts?
    As RCWilly says, at the moment, check this things.

  5. #5
    RC Racer
    Join Date
    Aug 2020
    Posts
    107
    open up the axles and look over the gears make sure none are broken. my trx6 had the ring and pinion wear out in the mid axle and did similar things

  6. #6
    RC Turnbuckle Jr. Greatscott's Avatar
    Join Date
    Mar 2004
    Location
    N. Idaho... Da Sticks!
    Posts
    8,147
    Make sure the hexes on your rear wheels are not stripped.

    Make sure your shift servo for your diff lock is working.
    Submarine Qualified, Chief Inducted, Navy Retired

  7. #7
    RC Competitor
    Join Date
    Apr 2018
    Posts
    69
    Ok, it looks like the diff lock was not fully engaged. like i mentioned, i put in new servos (the originals burnt out) and with the new receiver it runs off of a turn knob...i was not turning the knob enough to fully engage the diff lock.

    thanks everyone!

  8. #8
    RC Champion
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    Feb 2020
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    Quote Originally Posted by sparkyal View Post
    Ok, it looks like the diff lock was not fully engaged. like i mentioned, i put in new servos (the originals burnt out) and with the new receiver it runs off of a turn knob...i was not turning the knob enough to fully engage the diff lock.

    thanks everyone!
    Mate, check the lock wires and micro-servo horns and springs.

  9. #9
    RC Competitor
    Join Date
    Apr 2018
    Posts
    69
    Good call, I'll check it out. the diffs are great, but it adds complexity.

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