Arrma 1/10 Out Drive Defect

ajdragon

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Arrma RC's
Raider
Hi

I don't know how many of you have noticed this when you rebuilt your diffs but it would seem that the out drives for the differential are too short for one side, the diff cap side. Putting a out drive in the diff cup is a perfect fit but when it comes to the diff cap the out drives are to short or the holes are not far enough out to make a snug fit. Even with out the seals in place, once I put the pin in the hole the out drive is almost completely locked up in the diff cap, if I try hard enough I can get the out drive to rotate but doing so starts to destroy the spacer that is under the pin. Below is a picture of what I am talking about, you can see a ring on the NEW spacer where the pin is digging in and I did this just by turning the out drive by hand. After taking it off it is already starting to look like a cone.

Even on the video in this post you can see that he is having to force that pin into place.
https://arrmaforum.com/threads/arrma-diferential-rebuild.744/.

I know that some of you may think that it is supposed to be that way and that it just needs some braking in, but I can assure you that this is not the case. I have the same problem in both of my transmissions, the spacer in my original diff is in even worse shape and it has only bin run 3 or 4 times. And just so you know this is not the older 2013 design. I will try to move the hole a little bit further out on the shaft with a drill bit or a tiny file. I will be contacting ARRMA in the hopes that they will fix this problem, if they don't my Raider XL will get put back to stock form and then sold.

IMG_2743.JPG
 

ajdragon

Well-Known Member
Messages
690
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317
Arrma RC's
Raider
Hi

Well I spent about a half an hour grinding out the center of the diff cap in order to get the spacer to sit further into the cap. The out drives on both sides now rotate with the same amount of resistance. I so need to get one of those mini metal lathes, it would make these kinds of mods so much easier.
 

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