o Just a word of advice the Mugens have spiral cut
gears,they are not straight cut like most other brands
so that being said as the gears rotate the gear mesh gets tighter.
I have never stripped gears in my Mugen on the diffs but I did not
shim them tight either.You have a drive train that rotates with
less resistant with this style of cut gears and stronger to
because you have more surface area but leave a little
back lash or you will blow diff gears....