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Old 12-17-2020, 02:33 PM   #1
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Default topher builds a(nother) TRX4

Getting one last build in for the year, this time going back to one of the first trucks I owned, a trx4. I originally had a trx4 bronco, it was one of my favorite trucks after putting a few upgrades on it. I sold that one as a slider earlier this year to help fund the other builds and have missed having one ever since.

This will technically be my 4th trx4. I had another bronco that I bought shortly after the first one, so my friend could drive it. But didn’t keep that one too long. Then I built a trx4 sport kit which was eventually converted to the trx10.2 and has now been all parted out.

With this one I decided to get my favorite parts from the past builds and put them all in this one. So after some time gathering parts, I have this whole mess of fun to get going on. Electronics will be a mamba x with slate 1900kv motor and a hh v3 servo, all ran on 4S. This will be my first 4S rig.

Going to start with the chassis and axles today and will try to post pics as the build comes along.

Still no idea what I’m going to do for paint yet, or the body for that matter. I think I’ll start with the sport body in the kit and possibly work the mst fj body on it down the road.
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Old 12-17-2020, 02:39 PM   #2
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Nice man! I love the trx4 chassis, it's so capable even out the box. I have 2 right now, a blazer I put a JKU body on and wheels but pretty close to stock and a bronco with a lift kit, 2.2s and a velenion system and a few other odds and ends. Both work really good for me on really wet rocky ares like low streams.

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Old 12-17-2020, 02:40 PM   #3
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Default Re: topher builds a(nother) TRX4

Looks like a good start tb. Ive got a trx4 bronco ive been toolin with myself. Not sure what i wanna do with it yet
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Old 12-17-2020, 02:42 PM   #4
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Default Re: topher builds a(nother) TRX4

Nice to see you going back to your roots. Your trx 10.2 was a fave of mine. Anxious to see what you'll do with this one. Are you keeping the portals?

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Old 12-17-2020, 03:10 PM   #5
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Default topher builds a(nother) TRX4

Gotta love the TRX4. Canít wait to see what you do with it!
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Old 12-17-2020, 04:22 PM   #6
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Default Re: topher builds a(nother) TRX4

BUZZZ NICE PARTS those Yeah Racing Alloy Axle Housings are the BOMB not only do they fit perfect they add a nice even weight distribution I noticed better clearance and they can take a beating!!! im using them on my four wheel steer TRX4 ill be building soon!!! Right on Awesome Builds lots to to take in always BUZZZZZ......
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Old 12-17-2020, 04:41 PM   #7
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Default Re: topher builds a(nother) TRX4

Thanks dudes! And Max-D yes keeping the portals on this one.

Got the front axle done for now. I used most of the stock internals except the ring and pinion, and aftermarket parts for the rest of it.

Went with yeah racing axle housing. Ssd portal covers. Samix v2 chubs. djx shock mounts. Treal knuckles. HR high clearance steering link. Traxxas overdrive ring and pinion.
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Old 12-17-2020, 06:28 PM   #8
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Default Re: topher builds a(nother) TRX4

Sweet, another TB build!

Nice to see another TRX-4 build! Always enjoyed watching your other ones conquering some ridiculous lines! Great rigs and Iím still in love with mine even though it seems to see more shelf time than rock time here lately!

Looks like youíve got a lot of cool goodies to make another great performing rig! Love the look of the completed axle! Nice and beefy!

Liked and subscribed and canít wait to see what you have planned for it!


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Old 12-18-2020, 06:17 AM   #9
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Default Re: topher builds a(nother) TRX4

Some serious beef on that axle!

Always good to have a TRX in the fleet. Great trucks.
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Old 12-18-2020, 06:39 AM   #10
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Definitely a beefy axle!

The TRX-4 kit is one of the best builds. Everything just goes together so nicely.
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Old 12-18-2020, 08:17 AM   #11
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Default Re: topher builds a(nother) TRX4

I appreciate the comments gents. The front is one beefy axle for sure, as you can see I took a slightly different approach with the rear.

Stuck with the yeah racing housing but didnít add any other weight. There is an underdrive gear inside (and an OD gear up front). Added some aluminum portal mounts from eBay that allow me to outboard and mount the shocks to the portal mount instead of the shock mounts. The front axle has a similar feature on the Samix v2 chubs

Tim, I agree this kit is a joy. From the way the parts and hardware are packaged together, consistency in hardware sizes, and of course the fit and finish. Even with parts from 7 different manufacturers in the front axle I didnít have one fitment issue.
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Old 12-18-2020, 08:52 AM   #12
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Default Re: topher builds a(nother) TRX4

How heavy is the front axle compared to the rear?

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Old 12-18-2020, 11:05 AM   #13
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I’d estimate the front is about 300g heavier than the rear.
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Old 12-18-2020, 04:34 PM   #14
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Default Re: topher builds a(nother) TRX4

Great looking axles you have there brother! You really can't go wrong with a Trx-4. I love mine! Can't wait to see what you end up doing with it! Always great builds coming from you! Keep up the great work!
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Old 12-18-2020, 11:09 PM   #15
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Default Re: topher builds a(nother) TRX4

Yep, axles to make the rock crumble in fear. I imagine they help keep the Bronco tires below that big beautiful body. Looks great Topher, thanks for bringing another build!

There sure are a lot of good crawler platforms these days. The TRX4 really deserves some credit for that. Seems to me Traxxas lit a fire under the ass of the competition.
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Old 12-19-2020, 11:09 AM   #16
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A little more progress, got the chassis together. I forgot the sport didn’t come with the front battery tray, but since I’m using the Samix shock towers I’ll need to figure something else out anyway. I may work on fitting the pack to the tray opposite of the esc and receiver once I get electronics in.

A keen eye may notice an extra pan hard mount in the rear. No plans for 4ws but I had those towers around as spares after pulling them off an old trx4. You can see how much the pan hard mount bent on these HR towers (do not recommend) but they’ll do just fine in the rear. The Samix pan hard mount is much sturdier.

Building shocks and mounting the links to the chassis today, will try to knock out some electronics work before mounting the axles as well.

Still need to figure out paint!

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Originally Posted by AnimalHippie View Post
Great looking axles you have there brother! You really can't go wrong with a Trx-4. I love mine! Can't wait to see what you end up doing with it! Always great builds coming from you! Keep up the great work!
Thanks J! I love me a trx4 as well, solid platform up and down.

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Originally Posted by smog View Post
Yep, axles to make the rock crumble in fear. I imagine they help keep the Bronco tires below that big beautiful body. Looks great Topher, thanks for bringing another build!

There sure are a lot of good crawler platforms these days. The TRX4 really deserves some credit for that. Seems to me Traxxas lit a fire under the ass of the competition.
Thanks Smog! I appreciate it. The rex definitely seemed to up the competition with the other big manufacturers and that’s always good for us.
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Old 12-19-2020, 04:15 PM   #17
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Default Re: topher builds a(nother) TRX4

Looking good, and holy cow 300g? If that doesnít keep the front planted, I donít know what will lol.


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Old 12-19-2020, 08:48 PM   #18
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Didnít get as much done today since I slacked a bit, built the shocks. Used a 42.5wt oil but it feels a little thick for the pistons in these shocks. Might drop down to 25 but will give this a shot first.

Hereís a pic of the rear suspension to illustrate the out boarding of the shocks to the rear portal mounts. I ended up switching the rear shock towers to some that look like stock but are aluminum. Flipped them around to give the shocks a little bit of a forward lean.

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Looking good, and holy cow 300g? If that doesnít keep the front planted, I donít know what will lol.
Thatís the idea
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Old 12-19-2020, 09:27 PM   #19
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Default Re: topher builds a(nother) TRX4

Lookin good tb! May need to pick up a set of those portal cases. Kinda like the idea of them outboard like that
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Old 12-19-2020, 09:48 PM   #20
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I have to agree, I like the shocks mounted on the portal too.

How come you only put Samix shock towers up front and not in the rear?


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