Heya. Yeah, stock diff. I've built so many of these and have seen so few failures in my FWD cars. We did see an increase in failures a few years ago when the M06 became popular, but not nearly what I've experienced n the past year with the M04.

Diffs are built carefully - well beyond instruction manual levels. I've even gone so far as to deburr all the internals and break in the gears manually, followed by cleaning and inspection afterwards. AW grease is always used.

The motors are 18t versions of the "Hobbywing style" cans. They spin around 2200kv and have a little more torque than the 13t. When my race finished o Friday, I picked up my car and the motor was HOT. I don't think the gasket would have made a difference in this case.

The only conclusions I can come to are that the extra wheelspin created by a very loose diff in a RWD car is creating extra heat/wear internally. As to my breakdown on Friday, I'll go through the bearings again very carefully and look for signs of heating on the gear shafts.

Thanks, Jim