[QUOTE=coldfusion]Dun know if they are cast or machined. But they are def option steel ring gears from kyosho. Is it written on the tag whether cast or machined? will go back and check tonite.
Anyways, i know the manual in the pack says you don't need to shim the steel option gears but after running once i chipped one of the tooth on the small gear and damaged the ring gear at the front.
From that experience, i diregarded instructions and decided to add shims to keep the free play at minimum without binding of course and it seems to work for a few meets. This is with two small shims just after the big bearing before the pin and the small gear.
But the last time i serviced the gears i noticed some freeplay even with the two shims at the rear and added another small shim. Not sure if it was binding but after last weekend's race i found out i damaged both the ring and small gear at the rear again. It was razor sharp!
Serviced it last night and changed the god damn ring and small gear again for the third time, removed the third shim and left just two shims in there. added some ring gear grease and packed it back. will test it again this weekend. The front seems to only need one shim. If this @#$$ ring gear strips again i'm going to sell the car and get a RRR!!!