I just finished my GR3 with Gorillamaxx Single speed transmission and when testing the drive train out it seems the the rear is going in the correct direction and the front is going in the oppiset direction. I tried to reverse the from diff left to right (flipped it over) and the problem still exists.
Well I am stupid.... I took it apart and put it back together unflipped so it was the same as I first said. So I took it apart and put it back together again the right way and now it is working as it should.
So remember to always test it before putting it back together....
Thanks for the tips, also when you flip it remmeber to cut off the little tab that was on top as well..