Traxxas TRX4 2-Speed Transmission Disassembly

[@jasonsrcstuff9278]

Super helpful to lower the intimidation level for someone who has never torn into a transmission like this. Thank you for sharing your knowledge and experience!!

[@TotalScumbagRC]

4years later in sitting here feeling intimidated haha

[@STEVOD313]

I just built this kit yesterday it took me 12hours to do,it was only my second kit I’ve ever built, it was a lil complicated but did learn a lot about how the rig works!

[@T_gaming28]

I was thinking of putting a 2-speed transmission kit in my truck but 12 hours maybe not

[@DriftomaniacsRC]

very usedul. Coming up on 1am EST and i've just finished the strip down and grease as it had been in heavy water sat unused for two weeks. The 2 speed shaft was stuck. This in turn meant I could go knowhere fast or slow...This video saved me a lot of heartache and time. Thanks for the great video

[@mfathi007]

Couple of things to note. First the grub screw used for the pinion gear is VERY long ( not sure why Traxxas used such a long screw) and if you push the pinion back to have 100% contact with the spur gear then you'll notice that the grub screw will actually hit the spur. I think that's why Traxxas has the pinion gear so far forward. Mine was the same. Second, when you take the trans out to grease the gears pay close attention to the micro servo for the high and low speed selector. When you try and put it back on the trans make sure that there is no tension (or very little) on the servo saver. If there is a lot of tension, then simply turn the arm till the tension is reduce to minimum. This will save your servo in the long run and fix a noisy servo.

[@ToGrimmToWin]

M Fathi yes this is why people burn them up

[@urududuruuddu476]

M Fathi i

[@TWO.FourGhzCharliesRC]

You can spin the pinion around and use it either way. 👍👍

[@thatonesportsman450]

lost high gear. and didnt know how to take it apart. Thanks for the help!

[@jackbk2721]

Thank you so much just need a reassembly vid now XD

[@BrothrBob]

I like detailed dialog you go thru when pulling the transmission apart. It gives me an ideal what I'm looking at when I tear mine apart for future repairs. Great Video too~!

[@jeffreyyerdon6014]

Very helpful. Just snapped the rear portal axle on my TRX Blazer, so your vid will be very helpful in replacing it with an upgraded one. Thanks.

[@SteriluxGaming]

Thanks for this video. It is very high quality and very well explained in showing us the transmission.

[@RCGIGSportugal]

thanks for all your work Josh!

[@hybrid5132]

is there like a video on how it works or any other 2 speed transmission for rc crawler?

[@lror]

Thanks for your videos Harley 👍 Mines a day old and I opened the portals, diffs, transmission and transfer. To my delight everything was greased and other than the spur gear and engagement drive dog all gears were metal 😃

[@ToGrimmToWin]

LROR Land Rovers Off Road so your saying yours had more metal gears inside the transmission?

[@lror]

Eric Bostick Everything is metal gears except the engagement dog for the 2 speed and spur.

[@ToGrimmToWin]

LROR Land Rovers Off Road yeah I know I just don't count the spur as it's not as important

[@ToGrimmToWin]

LROR Land Rovers Off Road that's a big improvement over this and maybe a little more forward weight

[@Sgtfroso1]

Just got my trx 4 yesterday and found the front portal hub was missing a bearing! Insane front axle slop.

[@ToGrimmToWin]

nice that I read comments and now know the trans has metal gears now

[@Wittyusername82]

Eric Bostick yup, just had mine apart, all steel gears.

[@mactone007]

Thanks bro I just got my trx4 it was making a rubbing noise right out of the box eventually the noise went away it's probably same rubbing on the housing and my motor in esc get hot in crawling not bashing I'm going to take it apart and check thanks again bro

[@FrenchieRoboGuy]

Thanks you saved my blazer It had working crawling mode but trail mode was broke down

[@noodlesflawed4800]

Ryobi..Good. This truck gives me a chubby. The gizzards are a work of art and actually make real 4x4's somewhat primitive in comparison. Working on our Rc's is as much fun as it is bashing them. Traxxis have a history of tough trucks and my 3.3 Nitro Revo as never broken down once in 7 years and the only damage to my Revo was when my Jack Russell caught up to it and ripped the tyres appart.

[@ToGrimmToWin]

Noodles Flawed I love traxxas but tuey break easier than any brand I have owned they just have the vest part support

[@patrickholland7677]

Thank you .. saved my transmission ..

[@T0bimaru]

I did notice my 1979 Bronco TRX-4 RTR is identical EXCEPT it came with all metal gears out of the box. Not sure when TRAXXAS made this change. Worth a look if you're unsure!

[@HarleyDesignsInc]

I think all TRX in regular production got the metal gears. This was an early version.

[@michelebonomo6901]

Bravo! Grazie per i tuoi video. Sono stati di aiuto per me!!!

[@christophermendez3700]

Thank you did you grease the gears on reassembling the transmission?

[@augustinewillie136]

i know Im randomly asking but does someone know of a tool to log back into an instagram account..? I was dumb forgot my login password. I would appreciate any tips you can give me!

[@justusjaziel2340]

@Augustine Willie Instablaster :)

[@augustinewillie136]

@Justus Jaziel Thanks so much for your reply. I found the site through google and im in the hacking process atm. Looks like it's gonna take quite some time so I will get back to you later when my account password hopefully is recovered.

[@augustinewillie136]

@Justus Jaziel It worked and I finally got access to my account again. I'm so happy! Thanks so much you really help me out :D

[@justusjaziel2340]

@Augustine Willie Glad I could help xD

[@helmydewa]

One of the best gearbox in my opinion, but in only works if you want low ratio with TRX4 axle, that axle has low ratio too, i think about 8:1 or more i guess

[@lotust251]

my spot hear was not aligned as well. I just checked. Im glad I did the grub screw was rusted pretty bad after only a few fresh water crossings.

[@potjnkye86]

Great to see the insides and out. I have seen alot of steering servos going out though.

[@HarleyDesignsInc]

+Nitro Revolution RC yeah, without a typical servo saver like Traxxas normally runs, they are going to be hard on servos.

[@Bagman57]

Nitro Revolution RC And I heard it doesn't have a lot of power too.

[@brycemcdermaid7995]

Gary T. Can confirm

[@rcaddict420crawling8]

Power is definitely there servo sucks (but what stock servo doesn’t?)

[@BradleyNeilSipaun]

do you need to lubricate the transmittion?

[@Future-v3c]

What type of oil for transmission gear?

[@TOPRCBrasil]

Nice vídeo! Good Job, greetings from Brazil!!

[@hybrid5132]

is there like a video on how it works or any other 2 speed transmission for rc crawler?

[@ACE999]

Be nice to see a clip on how, and what's involved to alter the gear ratios for even lower gear crawling? Love your work, BTW!

[@THEMASKEDMASTER]

✌🏻😎🏴󠁧󠁢󠁷󠁬󠁳󠁿I think it’s time to actually take mine apart to clean it. It’s so intimidating but it need to be done. Ok I’m scared 😂 You have no idea how many times I have watched this but never actually started to disassemble it 😂.

[@kennethjensen7358]

Nice job Josh. So there are no grease in it when you get it from Traxxas? 😮 I thought there will be a lot more in it 🙂

[@rpmwithabdullah3473]

Bro I did fit the pinion gear to the full touch in the housing now am hearing loud noise, I don't know if it's from that or from the center gearbox, my crawler how ever does a speed of 40 mile per hour I installed a powerful motor what do you think happened, maybe the Bailon gears went bad?

[@TWO.FourGhzCharliesRC]

Thanks, great video!! 😊

[@humblerc841]

great info josh, thanks!

[@rustandoil]

I'm not keen on RTR Models, if I were fortunate enough to be able to get one of these, I would have to take it apart and put it back together "my way"

[@tomv3361]

😀

[@hybrid5132]

is there like a video on how it works or any other 2 speed transmission for rc crawler?

[@scubasteve2908]

Great video quick and easy instructions

[@yaboibigchungus5139]

awesome video will defo help me when I go to remove and strip my gearbox down quick question does the gearbox come already lubricated or does that not need to be lubed up? need to strip axles and gearbox down some time soon as hearing nasty grind

[@joedesalvo3316]

was going to buy this at the local hobbyshop the other day but I picked up their last SCX10 2 kit.

[@joeshmoe3490]

What makes the scx better?

[@nealedmondson3191]

joe shmoe the scx10 is a proven platform. The trx-4 is new and plagued with problems allready. Just as this video shows the internal gears are plastic lol. The portal axles are breaking, the shift servos are failing, the steering servos are failing. The trx-4 is a bashers truck. All that lockable diff shit is a disaster waiting to happen. Ive owned nearly every crawler/trail truck and the trx-4 i will never own. Traxxas always has to put its foot in the door on everything. Traxxas should stick to making basher vehicles. The scx10 and scx10-2 have a much more simple setup that is WAY MORE RELIABLE.

[@joeshmoe3490]

Neal Edmondson. Thank you for your feed back

[@MrDannyisr]

Neal Edmondson lots of BS, I own TRX4 and it’s super reliable. I’m rock crawling with it. Zero problems so far. I seen people putting 6s brushless in them, and really abusing them, and they hold amazingly well.

[@yinyeung674]

MrDannyisr Neal is obviously a axial fan boy that cannot accept the fact that traxxas has built a contender to the scx10 with more features. There could be cases on the internet of trx4 failing parts. But that does not reflect all trx4 are breaking down right out of the box. I am sure if I dig deep enough I will find people have problems with the scx10 as well.

[@EricsRC]

Needed thus. Juat got the K10 and hope this is the same.

[@franku211rc]

very informative again.... thanks again

[@MystikalDawn]

any idea how to take up some of the forward/backward slop in the transmission? Doesn't look very scale with your hobbywing fusion FOC when you come down off of an obstacle slowly and the truck lurches forward and stops for a second then continues on when the gears catch up.

[@JustGetHype]

Awesome! Thanks for the great info and tutorial!

[@lawinvlog865]

Hello idol sending my support konik bell all ingat lagi enjoy

[@hmerbay2]

Is this gearbox the same as the trx 6 ?

[@Bangbangboom51]

would you recommend putting grease on those gears? even light grease from tamiya maybe? Thanks.

[@wadecaton4017]

Bangbangboom51 the silicon grease from Traxxas works very well. Mine is so quiet now especially in high gear.

[@macp349]

@@wadecaton4017 the silicon grease that helps seal and waterproof the radio box? I just built the kit and mine is SO loud. Was thinking of taking transmission apart and regreasing everything

[@Bagman57]

Glad you did this tear down and that you found that problem with the pinion gear. I'll check that when I get mine. Also couldn't you turn the pinion gear around so the collar is toward the motor or is the collar too thick?

[@HarleyDesignsInc]

+Gary T. You can flip it I believe but there is room to properly mesh it without having to.

[@Bagman57]

Harley Designs Ok just wondering thanks.

[@eric1138]

Thank you for doing a take down of the transmission, portal axles, and remote locker. It's now time to cut to the chase on the elephant in the room. What is your plan to add more forward weight bias that this vehicle needs?

[@HarleyDesignsInc]

+eric1138 with the body off, the weight balance isn't bad for a trail truck. If it was for Comp crawling, I'd look at some sort of small saddle pack style batteries.

[@eric1138]

That sounds like a good idea. Move the ESC and the receiver box reward and put the saddle packs in their place.

[@eric1138]

I don't do competitions but negotiating over obstacles during a trail run is for me the reason for the hobby.

[@Bagman57]

I'll be putting on weighted wheels and tires on mine just as I have on my SCX10 Jeep. 6oz on the front, 4 on the rear.

[@OverlandFoo]

Very helpful thanks Harley

[@sumuduv]

Thank you so much... really helpful...

[@toddwanke602]

Very helpful - thank you!

[@qwanjinn]

Thanks for posting.

[@rickdarris2294]

I had the 2 speed transmission lock up on me while I had it on the bench. Still trying to figure it out. As a result, I lost a set pin and need to know what size they are and where l can get them. Thanks

[@JayDawgDrummer]

So ive taken my 2speed trans apart cause i noticed a few bearings were almost seized up and didnt spin well, replaced all of them and also put a bit of grease in there aswell, and when i put it back together it almost feels like the gear mesh is skipping allot, havent put it back in my rc yet. Ive watched a couple videos on youtube and cant seem to spot what i placed in wrong? Seems i put everything together properly, the teeth dont seem to be disfigured so i have no clue why its clicking like teeth are skipping, do you think its from too much grease? Or

[@TotalScumbagRC]

I need to pull mine apart and am feeling a bit intimidated by it, sitting down to watch you video, let's go see :)

[@blackhawkrc5271]

because I want to put a tire carrier on the back but I don't know if I can take those off

[@verynick]

Since there’s slipper clutch l, is it safe to change gear while in motion? Someone mentioned it should be parked before changing gear

[@anythingcars1389]

Don't shift when you are moving

[@GastonMaqueda]

When I reasembly it, I can us the same washers of the slipper clutch or I need to install new washers?

[@HarleyDesignsInc]

You can reuse them!

[@HarleyDesignsInc]

But you need to put them in the correct order

[@daviddeleon7850]

Is it good to add grease to the transmission?

[@nmnn422]

That’s why I bought the kit version

[@juantabby4787]

Wouldn’t it be cool if you could make it 2wd on the fly?

[@macp349]

That would be cool. I HATE with a passion 2wd version of almost all models of RC. They just slap a motor on the rear axle and call it done. I do, however like checking out the driving characteristics of just 2 wheels spinning, so I'll take out a driveshaft every now and then.

[@RCGrid]

Basically identical to the summit transmission with the shifting fork and dog carrier

[@HarleyDesignsInc]

+RC Grid yes, just a smaller size and with a integrated T-case.

[@HarleyDesignsInc]

+DeviousRC 66 the summit is their design and it's only like the summit in the fact that it has two constantly meshed gears with a Drive dog to engage them. It's a solid design and would make no sense to bash them for using it.

[@RCGrid]

Harley Designs I agree, no purpose in re-designing something that worked flawlessly for years

[@but531]

Complicated transmission this shows that the designers do real good work.

[@blackhawkrc5271]

I have a question can you take off the back tire and all that stuff to put up bumper

[@HarleyDesignsInc]

What do you mean to put up bumper? Can you take all the stuff off, of course, it just bolts onto the body basically. You could easily put a new bumper on it, you would just need to trim off a couple small tabs that tie into the bumper when installed. You can see those tabs in my overview vide.

[@dragonmodel9262]

Hi,do you know if there would be any point in changing the motor or pinion gear if thats possible? Or is this one good enough for real slow crawling?

[@HarleyDesignsInc]

+dragon model the stock gearing in low gear is very low, about 60:1, which is slower than any other model out of the box. For example an Axial SCX10-2 is about 47:1. So you shouldn't need to change gearing yet.

[@dragonmodel9262]

Hi,thankyou very much for the reply about this and for the information. Good info I didnt know.Good to know the motor is good too ty. I already ordered this model and will get it soon.TY

[@dragonmodel9262]

Oh yea it was good to see axle and transmission from the inside. Good video thank you about the pinion gear adjustment.

[@jackbarneykoda6787]

I need to swap the transmission because it’s broken. But I can’t remove it because the battery tray screws are stripped and the skid plate screws are stripped! So I’m officially fu(ked

[@Daniel-sk4wb]

lol same thing happened to me jajaja i drilled them out strip out couple Allen wrenches yea it’s a mess

[@travismerrix4391]

How well will this trans really hold up with those plastic gears?? Is it a thing like axial gen 1's change soon as it comes out of the box and are there any upgraded metal gears out for it??

[@robertg.tibelljohansson7869]

The Summit 1/10 and the Brushless E-Revo 1/10 has plastic gears, and they hold up fine.

[@HarleyDesignsInc]

+Travis Merrix Traxxas has very good plastic gears and there is a lot of reduction in the car. They will probably be fine for quite awhile.

[@travismerrix4391]

Thanks everyone I didnt own anything traxxas didn't know if it was like the scx10 that need upgraded out of the box

[@humblerc841]

Travis Merrix Traxxas plastic tends to be much more durable than axial.

[@ToGrimmToWin]

just so you know traxxas made a running change and the plastic gears are now metal

[@tiziano316]

Very strange at 4:00. Your low gear is made of plastic but on my trx-4 is made of Steel. Why? They change like this? I was lucky! 😅

[@HarleyDesignsInc]

They changed it very early, this was a prerelease truck.

[@tiziano316]

@@HarleyDesignsInc ah ok, thanks dude!

[@PhiddyPford]

What's the whole grease story ? Do we need some or just set pinion and go ?

[@HarleyDesignsInc]

+Mike McElligott personally, I'd add some in the transfer case and portals.

[@allmightygreat1892]

Thank you outstanding

[@Off-Road10]

should we be concerned there's no lubrication in the transmission?

[@HarleyDesignsInc]

+The Car Enthusiast Channel I would recommend adding some grease, at least in the transfer case where it is metal on metal. The metal on plastic or plastic on plastic likely isn't as important, however still somewhere I'd add some.

[@potjnkye86]

Harley Designs Again thanks. headed to the LHS Thursday and I'm still on the fence. I got burnt bad with the gen 1 X-maxx. the diffs would not stay in one piece. but I love these videos ocer any other. we get to see the insides and engineering that goes into vehicles were looking to buy. thumbs up from this guy. I personally would like to see a nitro trail truck. sure it would be loud and your habe to carry fuel but ever since I had 2 lipos explode in my home I've gotten rid of almost all my electrics.

[@bigchungus824]

can the transmission be locked in 2nd gear manually?

[@HarleyDesignsInc]

A zip tie would hold it into place likely.

[@rickkatevas6221]

Thank you....

[@xianyongli4267]

1:10 obviously assembled not according to the manual...have to take some space~

[@richardfazio2417]

I just greased my trans n noticed u have lplastic gears, in mine they were all metal.wuts up with that.

[@HarleyDesignsInc]

+Richard Fazio Traxxas made a running change. Bonus for you guys!

[@ToGrimmToWin]

this is nice to know now I am sure I'm going with the trx4 as it's only 40 more than a scx10.2 rtr and 50 more than the hpi venture

[@pabllo2004]

Any chance to put that transmission into FTX kanyon any one try that?

[@malitkies]

Starting to think I may just wait for the TRX-4 portal axles in the wild and in general veer away from the TRX-4 as a whole vehicle, and or just scalp the portal axles and put some other random axles underneath it than sell it lol.

[@ToGrimmToWin]

malitkies the transmission is now all metal gears

[@asaf4626]

You destroyd this

[@rdpancake]

hmmm the gears in my trx4 are all metal?!

[@HarleyDesignsInc]

+Firstruss Lastdale that is a running change Traxxas made. It's great for you guys!!!

[@t.t.6398]

Very strange.... mine is one of the very first TRX-4's and ALL the gears inside the transmission are metal, no nylon gears.

[@HarleyDesignsInc]

It was only on the pre-release versions. It just wasn't known at the outset that the change would happen.

[@tomv3361]

So thats why my sport is louder than those defenders..mine came with all metal gear transmission, here I see some plastic gears

[@tomv3361]

So complicated compared to axial

[@RobertCarrizal]

where was 4 speed LOL!!!

[@jesseharriott4253]

So much plastic in this garbage

[@jaxsonmunck3854]

What size pinion is it