ARRMA 3S and 4S DIFF MAINTENANCE AND TEARDOWN.

After I put together the 6S video on this there were many request for a 3S in 4s so here it is. I hope it’s helpful guys. 

[@wildgoose6596]

Finally I understand the use of the little lever @ 24:50 on the battery tray! That lever is absent on the 3s granite and big rock, but they left it on the 4s Mojave. Only the Mojave chasssis is much longer, and so that lever is nowhere near the power module. As an engineer, the existance of that little lever on the 4s Mojave hurt my brain. Now I understand it's purpose in the shorter wheelbase chassis and that it is simply a carryover artifact. Because of your video, I will be able to sleep tonight! Lol! 😂

[@BarstoneRC]

lol glad it was helpful buddy and thanks for watching

[@Boogie_the_cat]

Thank you. Very helpful video. I have the clicking when accelerating. I'm a big old noob, so i bought both F and R diffs, because since they're plastic, i imagine both will eventually break. I've never torn down my Granite before, and i see I'll need a longer 2mm hex for the drive shaft removal. D'oh! My diffs arrive in 9 days, so I'll have to get a driver with a long thin nose before then.

[@m2cracing168]

Awesome breakdown and explanation, always more to learn! Thanks for posting this!!!

[@BarstoneRC]

Glad you enjoyed it!

[@ronswitzer6057]

Awesome video!

[@BarstoneRC]

Glad you enjoyed it

[@Hungrybird474]

Hello , back k to RC after a hiatus of life 😂. They’re so much better now , drones too , I only have a few of each , 3 , but they’re fun for me . A 1/16 hbx 16980sa has proven to be the car that got me to get a arrma Kraton 6s and rlaarlo cf onmi terminator . Today , after 5 days my Kraton 6s went weird and started restarting itself after it sat motionless while on , controller was left on as well . Had to abandon for a phone call and it was like 20 ft away so I couldn’t hear it until afterwards walking closer . I thought I needed a new servo because it would not power on normally with the sounds . It would make it half way through when it got to steering it wouldn’t finish the beeps . The servo ,str, needed unplugged for a couple seconds and now it fires up like it always has for 5 days . I wonder what caused it to lose the i itial connection and if it will happen next time I take it for a ride ? If anyone knows what causes this thanks . I do like it .mid like to be prepared so I ordered a better servo ( according to reviews ) .

[@BarstoneRC]

I’ve had that happen before, and it kept randomly not working, and inevitably ended up being the servo

[@ramos.nitrorc]

this was soo helpful thanks. Now I need to buy diff fluid!

[@BarstoneRC]

Glad it was helpful!

[@redndeyes]

Those 3s diffs are why my bigrock sits in a box and waits for the maxx to get home for story time.

[@blacksheeprc8113]

Good information nice video buddy

[@BarstoneRC]

Thanks 👍

[@lukerecore]

And I made the decision to get my outcast 6s exb. And I'm like McDonald's I'm loving it

[@RON4RC]

Great how to vid bro Thankx for that I really should do my 3s senton atho I do know that we input gear is plastic teeth on it. Never done the diffs just the input once. Front one. 😊

[@BarstoneRC]

Thanks bud a lot of people really like 6s one so I put this together

[@daledavis8093]

I have the Arrma Big Rock 3s , ive noticed most that have Arrma's don't show or talk about it

[@BarstoneRC]

They’re a great line of cars. That’s why I’ve tried to put a couple videos out on maintenance on these things and the differentials.

[@kjetilpedersen583]

​@@BarstoneRCIs it easy to oopgrded to 4s switch the diff and to something else.Alu metal part 〽️ Can I use any Arma parts to big Rock 3s 😊nice video thanks for sharing this and really good info 😊

[@frederickgrassie3383]

Wish I saw this video before I removed the 3 diffs from my kraton 4s v2.5!!

[@alexh.9550]

On 3s lineup those screws that hold the differential output axles that are IN THE axle that is on the differential and idk how the hell do I reach those? You will have to buy a thin screwdriver I think or is there another way please? Screwdrivers are not cheap that I want and I’m scared to strip them out, I’m thinking to buy wera hex ones because they have an anti strip anti slip feature which is w cool. Help on how to get those screws another way.

[@BarstoneRC]

I have a set of MIP hex tools. They are long enough and best tools in the hobby

[@trentgalloway]

Very cool .. I need to bust mine open. Thought you might cut the relief hole for the spur gear while ya were in there and had the motor out. Should eliminate all the dirt that piles up?

[@BarstoneRC]

I don’t believe in doing that at least where I run because too much dust in fine dirt especially at the motocross track piles up in there and eats up the gears

[@RC4us]

I just now had to replace a diff in mine 15 hard months lol

[@kevingalea92]

I don't understand why most people when they do repairs on there cars they leave it dirty myself I always clean everything and I feel it takes no time at all to use a wet wipe or what ever to give it a fast clean before working on it or better yet after running the car

[@arq.andresfelipemoralesvar9593]

Good Sir thanks so much for this video! As a beginner in rc I find this super helpful, got an Arrma granite around 20days ago and already stripped the rear input gear lol. I ordered the metal ones from Arrma and I lowered the ESC punch to 2. I think I should learn to drive before I do crazy stunts so my drivetrain lasts longer 😅 I have a question about the shimming on both diffs. I ordered the same that you have “ARA210007” how to tell if I need to shim or no? That’s the only thing that scares me about the installation on diffs. Anyway thanks a lot for the tutorial, I’m saving this to my rc playlist I subscribed to your channel :D

[@BarstoneRC]

Thanks for the sub buddy normally I only shim the 6s diffs and when the differential is sitting in the housing, if there is play from side to side, when it’s fully seated, you know you need to shim it

[@arq.andresfelipemoralesvar9593]

@@BarstoneRC thanks for your reply!

[@Hungrybird474]

Hello . Did I hear you say all the newer models come with steel gearing instead of plastic ?

[@BarstoneRC]

I do believe that’s true on some models

[@winterwof6230]

hello, I was just doing this for myself and the video is super helpful but for the motor should the gear thats showing when you take it out spin freely or should it be difficult to push and spin?

[@BarstoneRC]

The big gear should spin freely the smal one should have a little feel to it as your spinning the motor with it.

[@winterwof6230]

@@BarstoneRC ok, so just to double check the big gear in the red section thing as you pull it off as in the video should spin freely?

[@winterwof6230]

and is it ok to just spray some WD-40 in there or no?

[@winterwof6230]

@@BarstoneRC i took the cover off and found what you were talking about the small ger spins fre ish but it squeks is it ok to spray it with WD-40?

[@BarstoneRC]

@winterwof6230 yeah when it not on the pinion gear

[@crabwalk1891]

What weight fluid are you running in the center diff?

[@BarstoneRC]

50k

[@lukerecore]

How r u feeling this morning?? It's going to be a good day today for bashing or wrenching 😂

[@BarstoneRC]

Well, I got a head to the airport in a couple hours and head out for work so unfortunately that we know bashing or wrenching lol

[@readeracingRC]

Nice vid and informative.. but more importantly... If I may ask .. what is the date of the tat that you have on your wrist. Just checking.. Have Fun.

[@BarstoneRC]

The one on my left wrist is my sobriety date in 2016 and the one on my right is the date. I beat cancer.

[@readeracingRC]

excellent brou. mine sober is 1-25-2013. congrats my friend. always great to hear of someone fortune. or there grateful moments. lol Have Fun

[@BarstoneRC]

@readeracing750 congratulations on yours also buddy

[@anthonyj.grossi4763]

Dude, put down the pipe!

[@BarstoneRC]

What pipe? I don’t have a pipe, but maybe I should find one?