I guess I got to you too late-using the stock outdrives will just cause you to chew up your diff and idler gears in due time. There is too much clearance between the bearings and outdrives.
This is a known issue for quite some time now, unless it has been rectified. The TRF201 steel outdrives or FF03 alloy outdrives provide a much tighter fit making sure that the diff gear does not wobble.
Second problem is that the ball diff has to be darn near tightened until the spring at the other end is fully collapsed before it stops slipping. The reason why people who race the FF03 in non-TCS races use the Spec-R gear diff with the Spec-R gear box.
Now that the FF03R is out, you can simply buy the Tamiya gear diff and gear box and be TCS compliant if you are setting up a car to race in that series.
The reason you need to get a new gearbox with the gear diffs mentioned is that the stock FF03 (non-R) gear box is too narrow to fit either Spec-R or FF03R gear diff.
While you are at it, get the alloy spur gear mount as the plastic one has a lot of run-out.
(Last edited by FuriousFlip : 7.25.12 at 5:06 pm)