Originally Posted by
theproffesor
You can run a diff in the front, there are no rules against it. I have one in the front of my Tamiya Evo6 that I run. You want to put a very heavy fluid in it though. 500k - 2.5million weight.
I also run a diff in the front of my Serpent Eryx. I use 2.5 million weight fluid. Car has crazy good turn in and the longer you run, the better the front grips. I recommend it highly. Plus, it's a lot less wear on the drive gear than a spool.