forward is reverse?

[MonsterMaxx]

You cannot simply 'flip the diffs' like you could with stock housings and turn the support collar around because the support posts are a part of the housing.

As the above user notes you did not read and/or follow the instructions. It's pretty clear in there that if you have a Nitro that you put the ring gear on the side of the case with the large 'N' engraved in it. If you have an electric you put the ring gear on the side with a large 'E' engraved in it.

At this point you have assembled it with the ring gear on the 'N' side which is why it goes backwards in your 'E'lectric vehicle.

You 'may' be able to simply turn the carrier around inside the case, however this will likely cause you to do the setup again,,,which may be a good thing. Since you didn't read/follow the instructions on a major point like which side to install the ring gear on, chances are you didn't follow some of the finer points as well.
There's lots of good info in those instructions, please read them.

I'm not bashing on you, we've all been there. Opened up a new gee-wizz and put it together without ever considering [instrustions] and thereby done it wrong.
Don't worry, reading the instructions won't make you any less of a man.:002: