I'm stripping gears which leads me to believe something is binding...but I've taken it apart and everything seems fine, except the spider gears are rounded out allowing more slip than I want....I was told the sirio .27 was a diff killer....and I upgraded my front and rear diffs to 7.5 gears and they hold fine.....and yes I am using 10,000 wt silicone in the center.....any thoughts on what's going on here....I just got the sirio and tried it for a week and went through 2 centers.....I put my RG back in yesterday so I could play today and it seemed fine, No slipping...I love the sick speed that sirio has but if I only get a few tanks out of my diff then it will be going somewhere soon....