Octavian, Da Smak, what you are looking at is an optical allusion. The diffs are not different and the pitch is not different. As far as the slot in the Diff Cas being bigger than the Gear well that is what Horizion/Sportwerks have it is bigger than the gear but the cross pins that holds the gears in place does not have any slop in it when the gears are installed. I know it looks weird when the gears heated up they melted into the plastic caseing. All if the internal beveled Gears are the same. NOW some of them you see there may be worn more than others just that some of the diffs that were blown out that day were original from a parts truck that I bought that was abused quite badly. But other than that they are all the same gears. If you still dont belive me look up SWK3082 this is the diff gear bag that is the internal gears for Mahem/Turmoil and Mayhem ST. In the ST book it is part #78 In the mahem book it is Part #84. [link=http://www.horizonhobby.com/Products/Default.aspx?ProdID=SWK3082]http://www.horizonhobby.com/Products/Default.aspx?ProdID=SWK3082[/link]