Thought I'd give an update. Finally received the differentials, after I repaired the stripped one. Stripped the rear again a few days ago and installed the cobra racing ones. They didn't quite line up with the screw holes, but was able to get them installed by brute force. Haven't tested them yet, haven't had time. I would have just trashed them and got the Traxxas pro built, but since I paid $135 for the pair, I couldn't throw them away. Conscience wouldn't let me try to sell them to some other unsuspecting soul. I'll update again when I actually get to run the truck. When these go out, which I'm sure they will cause I do run it hard, I'll have to also replace front and rear bulkheads due to forcing the fit. All things considered, save your money and headache, and go with another brand.