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  1. #1
    RC Qualifier RCWilly's Avatar
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    TRX-4 Conversion To TRX-6?

    So I discovered that there are many parts of the TRX-6 that are listed on eBay. There are chassis rails, the intermediate axles and other stuff that the TRX-6 has that the TRX-4 does not. I was wondering if anyone is planning to or has done a TRX-4 to TRX-6 conversion? As far as I know, I'm pretty sure the transmission and the front axle are the same (possibly the rear axle). Still doing some research, so if anyone knows more, please leave some comments! Thanks!

    btw: If I am able to do the conversion, I will probably mod the Defender body to be a Defender 6x6.

  2. #2
    RC Qualifier RCWilly's Avatar
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    Heres a list of what I came up with that needs to be added:
    - 2 shocks for the last axle
    - Intermediate axle
    - links to secure the 3rd axle
    - 1 shift servo for diff lock of 3rd axle
    - Fenders
    - Longer chassis rail
    (there's probably more that I am not aware of...)

  3. #3
    RC Qualifier TITANIUM94010's Avatar
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    The shift servo for the diff locker is shared with the last and middle axel, so you only need one, unless you want them to be separate. You'll need Traxxas part 8843.
    Last edited by TITANIUM94010; 04-09-2020 at 03:34 PM.
    Jumping: maneuver and pray it won't break.

  4. #4
    RC Qualifier RCWilly's Avatar
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    Ah, ok. Thanks!

  5. #5
    RC Qualifier RCWilly's Avatar
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    So I have both wheelbases, long and short (defender + Bronco). I know its more practical to convert the Bronco into a 6x6 since the TRX-6 is based on the short wheelbase, but I like keeping the Bronco a 4x4, and I like having the fenders on the chassis itself instead of the body. I also took a rough estimate of their differences, and there does not seem like a lot. The front of both trucks (the links, steering and everything) are completely the same. For the rear of the Defender, the rear links and driveshaft are just a tad bit longer than the Bronco's. I checked to see if the rear axle of the TRX-6 and the TRX-4 is the same, but unfortunately, it is not. However, only the actual housing is different (diff, shafts, and portals I assume are the same).

    I took a search on eBay and here's what I found so far:
    - TRX-6 Chassis with bumpers, and sliders without transmission (https://www.ebay.com/itm/Traxxas-TRX...4AAOSwOfFeYmt5)
    I think this is perfect because I can just move the electronics, transmission, and axles onto this chassis.

    - Metal Driveshafts (https://www.ebay.com/itm/Aluminum-Dr...kAAOSwDXld2LAQ)
    This also solves the wheelbase issue for the driveshaft and is sort of an upgrade.

    - Complete Set of Suspension Links (https://www.ebay.com/itm/TRX-6x6-Mer...AAAOSw8DJdlOcb)
    This solves the wheelbase issue and has additional links for the third axle.

    - TRX-6 Rear Axle Housing (https://www.ebay.com/itm/Traxxas-883...IAAOSwYZJd0J0W)
    This changes the TRX-4 rear axle to a TRX-6 rear axle.

    - Middle/intermediate Axle (https://www.ebay.com/itm/TRX-6x6-Mer...0AAOSwsFJdlOcX)
    The third axle is needed to go between the front and rear axles.

    - Two Additional Shocks (https://www.amainhobbies.com/traxxas...ra8260/p668361)
    For the third axle.

    - Two Springs (https://www.amainhobbies.com/traxxas...ra8040/p668317)
    For the two additional shocks : )

    I think that's about it to make the TRX-4 a TRX-6 (but I still might be missing something). I will probably upgrade the ESC and motor in the future, but I think its OK for now.

  6. #6
    RC Qualifier RCWilly's Avatar
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    LOL
    I forgot the most obvious thing!
    - the tires
    (https://www.amainhobbies.com/proline...68339?v=759962)

    Everything adds up to around $319 so far (cheaper and more fun than buying a TRX-6!).
    Last edited by RCWilly; 04-09-2020 at 04:52 PM.

  7. #7
    RC Qualifier TITANIUM94010's Avatar
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    Heres a list of things you might need:

    -Hex nuts for securing wheels

    -Wheel hubs (may vary based off of rims)

    -Lots of screws

    -Body mount tower (depends on what body you're using)

    -Wheels

    There might be some more stuff, but that's I can come up with for now.
    You might want a stronger motor for the car, because the stock motor is used to power the standard TRX4, and this thing's got a whole other axel and some other added weight. The stock motor will do fine if you don't really need too much torque or power, but a better motor would help.
    Jumping: maneuver and pray it won't break.

  8. #8
    RC Qualifier RCWilly's Avatar
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    Yeah, thanks! I think screws may be an issue (I will reuse all the screws that are on the TRX-4, but having that extra axle may need a few extra screws. I'll take a look at the TRX-6 exploded view and figure it out). I think that I will use the stock motor for now, and understand more at what it is (will be) lacking (maybe power, torque or both). I might go with a Hobbywing Axe 3300kv (with the 550 motor). I was originally going to try to extend the Defender body with a second one, but I haven't really thought of a way to combine them together without it having a visible seam on it. I might go with a Unimog body from the Axial 6x6.

  9. #9
    RC Racer
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    Thanks for this thread... I have a TRX-4 sport that I plan on converting to TRX-6 as well !
    I was basically going to breakdown the TRX-4 and cross off the parts on the TRX-6 parts list and the buy whatever isn't crossed off.

    Your thread may save me that trouble

    Someone here in Montreal built one that has 6ws. It's pretty cool. I may do that later on if the build doesn't cost me too much.

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  10. #10
    RC Turnbuckle Jr. Greatscott's Avatar
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    Very interesting thread, looking forward to seeing how a conversion works. You guys are laying the groundwork for a project I have planned in the near future... A TRX8.
    Submarine Qualified, Chief Inducted, Navy Retired

  11. #11
    RC Qualifier RCWilly's Avatar
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    A TRX-8. That's a cool idea. Also, what bodies are you guys planning on to get/modify to fit the TRX-6 (and TRX-8)? I may try to extend the stock Defender body with a second one, or a Unimog 6x6 body from Axial.

    I also found a cheaper way to get the intermediate axle. The intermediate axle is the same as the TRX-4 rear (everything same except the diff cover is replaced with part #8846, and need one additional 6x13x5mm bearing and one additional 5x11x4 bearing for the driveshaft)

    $40 TRX-4 rear axle: https://www.ebay.com/itm/NEW-TRAXXAS...wAAOSwn35aothz

    $4 part #8846: https://www.ebay.com/itm/Traxxas-884...-/293334831655

    $3.50 5x11x4mm Ball Bearings (2): https://www.amainhobbies.com/traxxas...a5116a/p668300

    $4 6x13x5mm Ball Bearings (2): https://www.amainhobbies.com/traxxas...a5180a/p628261

    Total cost for the intermediate axle is now $52 instead of $80.
    Last edited by RCWilly; 04-10-2020 at 02:17 PM.

  12. #12
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    For my part, I was thinking of some kind of flatbed with a half cab

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  13. #13
    RC Qualifier RCWilly's Avatar
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    Yeah, a flatbed sounds cool. Are you going with a Unimog cab?

    I also revised the list of items for the conversion (costs about $45 less):

    - TRX-6 Chassis with bumpers, and sliders without transmission (https://www.ebay.com/itm/Traxxas-TRX...4AAOSwOfFeYmt5)
    This will be the base chassis. The transmission and electrics will drop straight in, as well as the axles.

    - Metal Driveshafts (https://www.ebay.com/itm/Aluminum-Dr...kAAOSwDXld2LAQ)
    Can’t really find the plastic driveshafts, so this will do. It’s like an upgrade : )

    - Complete Set of Suspension Links (https://www.ebay.com/itm/TRX-6x6-Mer...AAAOSw8DJdlOcb)
    Since the Defender is the long wheelbase, and the TRX-6 is based on the short wheelbase, this basically solves the wheelbase problem and provides the links for the third axle as well.

    - 6x13x5mm bearings (https://www.amainhobbies.com/traxxas...a5180a/p628261)

    - 5x11x4mm bearings (https://www.amainhobbies.com/traxxas...a5116a/p668300)

    - Diff part # 8846 (https://www.ebay.com/itm/Traxxas-884...-/293334831655)

    - Just need the diff pinion: (https://www.ebay.com/itm/Traxxas-827....c100667.m2042)
    The 4 parts listed above are the parts needed to turn the rear axle of the TRX-4 into the intermediate axle of the TRX-6.

    - Rear Axle of TRX-6 (https://www.ebay.com/itm/TRX-6x6-Mer...AAAOSwXChdlOcj)
    This is the complete rear axle of the TRX-6 and has the long cable for the diff lock.

    - Two Additional Shocks (https://www.amainhobbies.com/traxxas...ra8260/p668361)

    - Two Springs (https://www.amainhobbies.com/traxxas...ra8040/p668317)
    Shocks and springs are for the third axle : )

    … And total comes to $274 (previous was $319)

  14. #14
    RC Turnbuckle Jr. Greatscott's Avatar
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    Quote Originally Posted by RCWilly View Post
    A TRX-8. That's a cool idea. Also, what bodies are you guys planning on to get/modify to fit the TRX-6 (and TRX-8)? I may try to extend the stock Defender body with a second one, or a Unimog 6x6 body from Axial.

    .
    For this I will go full custom, and full 3D. But, the back 2/3s will be flatbed.
    Submarine Qualified, Chief Inducted, Navy Retired

  15. #15
    RC Qualifier RCWilly's Avatar
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    That's cool! Now I'm just looking at real 6x6 trucks and the body options that I have...

  16. #16
    RC Qualifier RCWilly's Avatar
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    I am thinking of having something like this for a body (Land Rover 6x6):

    https://classicoverland.com/black-mamba/

    (Probably going to do it with two Defender bodies)

  17. #17
    RC Qualifier TITANIUM94010's Avatar
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    Thats a very nice looking truck!

    I'm planning to make a low COG Veloci-Raptor body for my TRX6, to use as the basher/performer, because the G wagon body right now has turned my car into a shelf queen.

    I'm not sure about how I'm going to connect the bed to make it smooth and not show any lines. I might have to go Hardbody or 3d printed for the bed, but that kind of destroys the performance.
    Jumping: maneuver and pray it won't break.

  18. #18
    RC Qualifier RCWilly's Avatar
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    Nice, the Hennessy Veloci-Raptor also looks pretty cool. I think I also might have the body connection issue. What I am going to try to do is to use a sheet of polycarbonate as support for the inside, and then cover the connection line on the outside with a thin strip of sticker that is the same color as the body. I've also seen a deeper bed made for the G wagon body (maybe it's possible to use it on the Veloci-Raptor?) (link here: https://www.ebay.com/itm/Truck-Bed-C....c100677.m4598). Anyways, I hope the body turns out the way you want it to! Happy trailing! : )

  19. #19
    RC Qualifier RCWilly's Avatar
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    OK, guys I made a mistake. Well, sort of... The cost should be about $150 more because of the shipping : (, but I am trying to revise another less cost list.

  20. #20
    RC Qualifier RCWilly's Avatar
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    OK, guys. I've managed to actually reduce the cost of the build. Here are the links to the build.

    Screws ($7): https://www.ebay.com/itm/NEW-TRAXXAS...YAAOSwOMlaotet

    Chassis Rail ($40): https://www.ebay.com/itm/Traxxas-882...6/352923862738

    Chassis Parts ($50): https://www.ebay.com/itm/TRX-6x6-Mer...gAAOSweJxdlOcQ

    Shocks With Springs ($35): https://www.ebay.com/itm/NEW-TRAXXAS...sAAOSwZGRbYkMZ

    Metal Driveshafts ($40): https://www.ebay.com/itm/Metal-Drive...2CT7A&LH_BIN=1

    Rear Axle ($55): https://www.ebay.com/itm/TRX-6x6-Mer...AAAOSwXChdlOcj

    Diff cover for intermediate axle: https://www.ebay.com/itm/Traxxas-884...-/293334831655

    6x13x5mm-ball-bearings: https://www.amainhobbies.com/traxxas...a5180a/p628261

    5x11x4mm-ball-bearings: https://www.amainhobbies.com/traxxas...a5116a/p668300

    Just need dif pinion: https://www.ebay.com/itm/Traxxas-827....c100667.m2042

    (four bottom adds up to be $27, install the four parts on the rear axle of the TRX-4 to make it an intermediate axle) Also keep in mind that I did not add the tires and wheels and things like that. This time, I also kept the shipping price in, and hopefully I did not forget something this time. : )

  21. #21
    RC Qualifier RCWilly's Avatar
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    btw, the total cost is about $220.

  22. #22
    RC Qualifier RCWilly's Avatar
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    Ok, guys, there are a couple of clarifications that I have to make:
    - the TRX-6 is based on the long-wheelbase, so the front is completely the same, with the exception of the fenders (somethings above are not necessary)
    - some items listed above are out of stock, or unavailable (can't find another rear axle, so I may have to get a rear TRX-4 axle and change the housing)
    I will wait for the things to go back in stock or get it from other places...

  23. #23
    RC Racer
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    I finally did a parts comparison by using exploded views of both a TRX-4 sport along side a TRX-6. For the axle, my cost is in parts to be built as I couldn't find any already built.

    The total I came up with was about 550$ USD through several online retailers (and at least half is out of stock). This doesn't include shipping, import and currency exchange to CAD$.
    I gave this list to 3 LHS. One has come back at 950$ CAD.
    The second is working on it and counting parts he has that are new but stripped from broken down models.
    The third didn't even answer lol.

    But at this point, with this estimated cost, plus the loss of a TRX-4, I prefer to just buy a TRX-6...

    I really wish they would just come out with a kit already
    Here is the list I came up with:

    TRA8850. (Rear driveshaft)

    tra8849

    tra8196. 2 gear conversion

    tra8837. axle housing

    tra8841. tlock cable

    tra8847. diff cover

    tra8831. links

    tra8832. links

    tra8836. rear mount

    tra8195. tlock diffs

    tra8281. tlock set

    tra8282. diff gear set

    tra8283. tlock cable

    tra8835. skid plate

    tra8820. bumper

    tra8829. chassis

    tra8818. exhaust pipes

    tra8828. rear fenders

    tra8830. chassis cross member

    tra8245. suspension links

    tra8245. suspension links

    tra8227. front/rear axle mounts

    tra8260. shocks

    tra8246. int diff cover

    tra8253. portal housing

    tra8253. portal housing

    tra8255a. stub axle

    tra8255a. stub axle

    tra8255a. stub axle

    tra8258. portal gear

    tra8258. portal gear

    tra8251. portal gear cover

    tra8251. portal gear cover

    tra8269. hex

    TFE4522. Fast eddy bearings

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  24. #24
    RC Qualifier RCWilly's Avatar
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    True, it would really be awesome if Traxxas came out with a TRX-6 kit. It would be even better if it has no body and no electronics (I have a custom body in mind that I can to make (Defender 6x6 pickup), and I also have an idea of what electronics to get (FS GT5 Radio+reciever, Hobbywing axe 550 3300 kv brushless system, Savox Servo)) except the shifting servos. It would also be amazing if they came out with another different body for the TRX-6.

    btw, you can get whole transmissions, whole axles, and driveshafts on eBay (it also costs less, but it still adds up to some $300).

  25. #25
    RC Racer
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    About 10 mins after I wrote, the 3rd LHS answered me

    The total came to 850$. Seeing the size of the order and I am a regular customer, he offered 20% off to total 680$

    So looks like I will have a summer project

    Should have it all in stock for May 4th, which is so far when the government should be allowing businesses to start opening again.

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  26. #26
    RC Qualifier TITANIUM94010's Avatar
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    Happy building!
    I've got myself a summer project too, a tamiya XV01 kit, which still is out of stock but worth the wait. Hopefully it goes well.

    Good luck!
    Jumping: maneuver and pray it won't break.

  27. #27
    RC Qualifier RCWilly's Avatar
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    Nice, great to hear that you guys both have a summer project. As for me, I still have online assignments and stuff from school (I'm in highschool btw), so I may have to wait until June to get started on the conversion.
    Meanwhile, stay safe out there, and have fun with your projects!

  28. #28
    RC Racer
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    Nice order arrived today...
    This TRX-4 should be a TRX-6 hopefully by the end of this summer

    I love Traxxas

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  29. #29
    RC Turnbuckle Jr.
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    Nice. Shipping is crazy sow right now. Not complaining much, just stating facts. Throw tracking out the window.


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  30. #30
    RC Racer
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    Quote Originally Posted by Gripdog7205 View Post
    Nice. Shipping is crazy sow right now. Not complaining much, just stating facts. Throw tracking out the window.


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    Same here... I have parcels coming through Canada Post and none of them have even changed status in over a week lol
    But an order this size I went through my LHS. They ordered a few weeks ago during shutdown, but they have been open for business since yesterday good to have them back

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  31. #31
    RC Qualifier RCWilly's Avatar
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    Shipping seems to have gotten better now, I hope you guys have already received your packages

    As for me, I am probably going to wait a few more months before starting this project. Most parts are out of stock, and my other cars (Slash 2wd, UDR, 4 Tec 2.0 ) are due for upgrades. (The Slash has not received any upgrades for over a year).

    In the meantime, I would probably upgrade the ESC and motor on my Bronco to the Hobbywing 1080, and HH 21T Trailmaster motor, and upgrade the ESC and motor on the Defender to the Hobbywing Axe (to get it ready to be turned into a 6x6). The UDR would probably get a new rear diff and a stronger servo. And the Slash would probably get the LCG conversion kit and aluminum steering bellcranks.

    (I'm still going to turn the TRX-4 into a 6x6, just at a later date)

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