i run mine with the center unlocked and with thicker oil in the front and rear so i dont get that horrible one tire ballooning and breaking the cups. thats the problem i was having one tire would balloon and the cup would break, this engine has way too much power for one wheel to take. i would suggest some thicker oil in the front and rear than using the grease. i think the grease is 3000 or more so i would go up from there, i think i have 20k in the front and 25k in the rear, i dont remember it was a long time ago i will ckeck to see if i still have the bottles.