Is this the best ALL aluminum differential for Traxxas 4x4 Slash, Rustler, Stampede?

Purchase Cobra Racing Aluminum differential:

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In this video, I do a quick review on the Cobra Racing all aluminum differential for most of the Traxxas 1/10 scale cars. This differential is compatible, but not limited to:

Traxxas Slash 4x4 / ultimate / platinum
Traxxas Rustler 4x4
Traxxas Stampede 4x4
Traxxas Bandit 4x4
etc...

Made of ALL aluminum T6, the differential is built like a tank and will never break on you. Comes with a full set of rubber sealed bearings.

[andrewfrench]

I've tried 3 different ones for rustler not saying who's but gonna try this one from you soon hope this will hold up and solve this plastic housing junk

[Cadenclipz]

Just bought one trying to find the one that’s best for the rustler all the other ones keep stripping and breaking hope this is the one I’ll buy for now on thanks man

[Jarcademis]

I’ve been looking for a replacement for my stock plastic diff on the Rustler 4x4. Does this one come with the internal gears as well?

[leecalhoun]

So the diffs come without fluid? Is there a seal so I can fill with fluid? I’m about to check out with the diffs and housings but I want to make sure first.