I used the super heavy diff locker stuff. (doesnt fully lock it, but its pretty good)
I just upped my punch control to 50%.
The wheels are stock but the tires are not.
Just as a small test of the MMM fan, i just flipped my buggy over and ran it unloaded till the fan kicked on. (not to long) The fan kicked on for about 15 sec and shut back off. So its working right.
more testing tomorrow.
Thanks all!!