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Thread: c0bra turns a trx4 into a hard body monster truck!

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Old 06-06-2020, 09:10 PM   #1
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Default c0bra turns a trx4 into a hard body monster truck!

Like the tittle says I picked up used (but still new) trx4 chassis kit, yes itís that one from YouTube fame thanks to Harley designs and the scale builders guild.

Anyways the plan is to mount a tf2 lwb rtr body to the trx4 and turn it into a monster truck! Now this will be my second trx4 monster, no there isnít a build thread for the other one (bronco with axle upgrades and 1 rtr servo left). Anyways this one is going to be somewhat similar but also still different.

First things first were to get rid of the fender wells as they created a clearance nightmare and mount sport shock towers all around. I will try to switch the front back to the fenders, but the rear is staying the way it is. I also removed he stock sliders and mounts in order to get the holes cut in the bed



Then after attacking it with a Milwaukee rotary tool and a razor knife to clean up the edges a bit



The edges arenít the cleanest and it couldíve been a little smaller but oh well itís a monster truck anyways so itís going to get scratched up.

Next step was to mount the sliders back on with out the extensions and radio box. Iím not going to use the radio box as nothing I have is waterproof. Then I attacked them with the same rotary tool to trim the sliders back and then drilled the slider extension holes all the way through and trimmed the sliders down flat. I also cut a notch in the front to clear the body mounts. Only pic I have is before trimming the the slider flat. Then I removed the shift servo (going brushless on 3s)



Then after designing and printing my own body mounts which took way too long, got half way through and had to restart due to the printer not having anything coming out. Anyways 5 hours into a 3 hour print and the mounts were finally done. I do need to make a v2 as the spacing between holes is a bit off. Then some screws later and magic finally happened



Well maybe not magic but who cares. Next steps are to order the axle upgrades if going to be using, basically replacing the plastic with aluminum, and will be getting a locker for the rear. Once all of the parts are in as well as the servo, Iíll rip the truck completely apart and put it back together with a new chassis (already have) and the long arm kit (also have). Iíll also make sure the screws are the correct size, so far the work Iíve done I didnít really care how long the screws were since the plan was to just do a mock up first anyways.

Anyways Iíll probably be picking up a savox 2290 and a mamba x esc. I already have a pro4hd and a roc412hd, both around 3000kv, sitting around begging to be used. Kinda leaning towards the pro4 for this. Also will be getting a receiver for my mt44 and a powershift light kit.

Wheels and tires are up in the air, maybe 2.2 pitbulls or smt10 wheels?


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Old 06-21-2020, 04:59 PM   #2
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Default Re: c0bra turns a trx4 into a hard body monster truck!

Once I put trx4 sport wheels and tires on the truck that the tires rubbed the back of the wheel arches really bad, so I made an adjustment on the mounts and then they rubbed the front of the arches. Finally on the third version of the mounts they are just about perfect!



Then I realized that with cutting off so much of the stock sliders, there isnít really a heck of a lot of room to mount electronics so I made a small printed plate that attaches to were the xl5 esc is meant to



Print didnít turn out perfect but itís good enough for what I need. Next on the list is to rebuild the chassis how it should be as its currently thrown together and get rid of that 2 speed. Wile doing so Iíll put on the lift kit with some wraith 2.2 wheels I have sitting around. They wonít stay but they will work for now.


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Old 06-25-2020, 04:24 PM   #3
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Default Re: c0bra turns a trx4 into a hard body monster truck!



I went through the truck and rebuilt the chassis correctly with new uncut rails and installed the long arm kit. Instead of going with the included shock oil I opted for 50wt instead to have a fairly stiff suspension.

Unfortunately I canít find 4 spare 2.2 wheels and tires and I donít want to steal the ones off the bomber or bronco just yet.

Next is to wait for a bunch of axle upgrades to come in from locked up and put everything in and test that the front locker still functions


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Old 06-26-2020, 09:30 PM   #4
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Default Re: c0bra turns a trx4 into a hard body monster truck!

really cool
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Old 07-04-2020, 09:02 AM   #5
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Default Re: c0bra turns a trx4 into a hard body monster truck!

I got all of the axle upgrades, just need to find time to put them all on.


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