05-14-2022, 06:11 PM | #1 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| TRX Based 8x8
Howdy folks. after building a couple TRX-4 and SCX10 II 6x6 conversions (pics below), I wanted to challenge myself and go for an 8x8. So, if ya'll are interested follow along!! Disclaimer: I don't have it all figured out, so I might be leaning on the community for ideas and solutions Here's my TRX-4 converted rig. For which I started a thread: TRX-4 to 6x6 Conversion Guide and the SCX10 II based one. This build will be based on the TRX-4/6 platform. Step one is extending TRX-6 chassis rail to accommodate the additional front axle. After staring at the parts I had on hand, I decided to lop off the front section of the TRX-4 rails and use that as the chassis extnsion. Proof of concept below: |
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05-14-2022, 06:18 PM | #2 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8
The rails have to be hammered flat to remove the curve where the stock rails sway outward to accommodate the skid/tranny mount. I have brass strips lying around, but for this joint, I really wanted to use steel as there'll be considerable stress (I think) on that joint. Again, scrounging around for something suitable, I decided to use TOOL steel Step one: fit then drill and tap one side. |
05-14-2022, 06:26 PM | #3 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8
And joined!! Here it is with a TRX-6 rail for comparison. I purposely left the extension long at the front until I figure out what needs grounded/filed off to accomodate a bumper mount. So that's all for now, I'm waiting for delivery of a second hand TRX-4 I bought on FB Marketplace which will be the donor truck for a lot of the parts. |
05-14-2022, 07:42 PM | #4 |
I wanna be Dave Join Date: Jun 2020 Location: The Big Island
Posts: 2,010
| Re: TRX Based 8x8
Sweet build idea man! Good idea with the chassis as well. When you hammered the frame straight, did you heat it up at all or just a cold bend? __________________ Amain Addict |
05-14-2022, 08:28 PM | #5 |
RCC Addict Join Date: Jan 2019 Location: Corvallis, OR
Posts: 1,561
| Re: TRX Based 8x8
Very cool, looks good so far Sent from my iPhone using Tapatalk |
05-14-2022, 10:36 PM | #6 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8 |
05-14-2022, 10:37 PM | #7 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8 |
05-15-2022, 08:05 AM | #8 |
I wanna be Dave Join Date: Sep 2011 Location: Douglassville, PA
Posts: 4,224
| Re: TRX Based 8x8
Sweet... been debating doing this as well, but on an older SCX platform. Curious to see how it comes along!
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05-15-2022, 08:16 PM | #9 | |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8 Quote:
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05-18-2022, 09:33 PM | #10 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8
Mo parts arrived Was slammed at work this week, but over the weekend I hope to move this along. The deal on FB Marketplace fell thru, so I've ordered a new TRX-4 Sport kit from which to source parts. Last edited by JimInMiami; 05-21-2022 at 08:10 PM. |
05-19-2022, 12:33 AM | #11 | |
I wanna be Dave Join Date: Jun 2020 Location: The Big Island
Posts: 2,010
| TRX Based 8x8 Quote:
Three steer axles?? __________________ Amain Addict | |
05-19-2022, 11:50 AM | #12 |
Pebble Pounder Join Date: Sep 2021 Location: Canada
Posts: 114
| Re: TRX Based 8x8
If you need a place to send all those un-needed locking diff parts, you just let me know ;) I just picked up a used sport that could use selectable diffs 👍 |
05-19-2022, 11:58 AM | #13 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8 The selectable diffs can easily be locked with a washer, but if you send me a couple of spools, I'll trade ya |
05-19-2022, 06:47 PM | #14 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8
It begins.... The challenge of this build will be figuring a way to mount the frontmost axle's links, so for now I'll concentrate on the front end seeing as the rear setup is pretty much the same as the TRX-6's. |
05-21-2022, 08:04 PM | #15 |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8 I think that for clarity the axles should be referred to from front to back as axle 1, axle 2, axle 3 and axle 4. I wanted to hang axle 2 today but first had to change it to a "pass thru" axle so that the second pinion will drive axle 1. I used part # 8846 which can be seen in the pic above instead of the stock diff cover. A couple of bearing and a second pinion and it's good to go. Hung As I never liked the two-part unit that comes stock, I'm using a Bowhouse RC skid for those wondering. |
05-21-2022, 09:08 PM | #16 |
RCC Addict Join Date: Jan 2019 Location: Corvallis, OR
Posts: 1,561
| Re: TRX Based 8x8
This is very cool, looking forward to seeing how you tackle the “obstacles” Sent from my iPhone using Tapatalk |
05-21-2022, 10:14 PM | #17 |
I wanna be Dave Join Date: Jun 2020 Location: The Big Island
Posts: 2,010
| Re: TRX Based 8x8
Looks good so far! I’m really interested in seeing how your links will work out on Axle 1. __________________ Amain Addict |
05-24-2022, 07:13 PM | #18 | ||
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8 Quote:
Quote:
Rather than fabricate a custom mount for the links, which given my limited skills would've posed a challenge I decided to try and use the stock rear link mount for the TRX-6. That's part #8830 in the exploded view: https://traxxas.com/explodedviews/TR...assis-Assembly But.... two problems: 1) There's not enuf room between shock mounts for axles 1 and 2. 2) My front rail extension is not straight, it's "W" shaped. After staring at this for three days I hit on an idea: Step 1 reduce the length of the link mount, here is the modified version next to the stock one: A band saw comes in handy to get an accurate cut here, btw. Next cut away at the rails to allow the link mount to sit in the channel. I'll clean those cuts and repaint later, I just wanna know if this is gonna work for now. Trial fit in the chassis rail. With this arrangement the link mount will not interfere with the shock mounts, but I'll really only know if everything also clears the steering mechanism for axel 2 once I reassemble. Thanks for following along, and stay tuned! Last edited by JimInMiami; 05-25-2022 at 06:54 AM. | ||
05-27-2022, 03:45 PM | #19 |
Pebble Pounder Join Date: Oct 2015 Location: Mt. Prospect
Posts: 119
| Re: TRX Based 8x8
I built an 8x8 on Axial frames using HG axles a last year and getting the steering and drive shafts to clear each other took a lot of trial an error. I ended up using fairly short links on the front but the thing still flexes pretty well. Custom Built 8x8 With Tonka Cab |
05-31-2022, 07:54 PM | #20 | |
Quarry Creeper Join Date: Jan 2020 Location: MIAMI
Posts: 417
| Re: TRX Based 8x8 Quote:
The cab's arrived Yes, I know it's premature to be buying the cab seeing as I haven't even sorted out the chassis yet, but even if this build's a fail, I can always use it in something else. Check out the detail! | |
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