I know 30 k seems real thick for the center diff, but it seemed to unload to much with up to 10 k in the diff. I was watching a team drivers car at one of the state races and noticed his front tires did not balloon anymore than the rear did. After asking him about his set up he was running 50 k in the center diff. That is where I got the idea from. Just about every track in Florida is high bite so I think the center fluid may be an advantage.