Changing the front oil wont change that. I would start in the center with 300k-500k oil and if you still want to do the front and rear it depends on you. I'm going to try 80 in the front, 500 in the center and 90 in the rear. I'm almost certain that's the #'s I've seen from a few bashers out there. I might put something heavier in the rear but I'm unsure as of yet. Any way...start in the center so the rear wheels get more power and go from there. Don't forget to heat the screws so you don't stripe them out.