This gear diff is the answer that you have been looking for. Finally a diff you can set and forget. Great sturdy, quality construction makes this a breeze to assemble and it slips right into the M05 or M06. Get an extra set of outdrives to set you up for a long time. Only thing missing was the two bearings for either side of the differential.
This is now the go to diff for the Mini. Set it and forget it. Fill it with 300000 oil for a M05 and you have a spool like diff the doesn't need to be maintained like a ball diff. In a M06 fill it with 2000 and it comes out of the corner hard. Easy to build and zero leaks. Outdrives will not fit a M03.
This gear diff is a must have for any mini racer! With 300000 weight oil (or higher for tighter diff), your mini will drive much better.
Power through corners with ease and off the line in a flash.
Highly recconmended as once set up, you can just forget it and have hassle free driving!