Totally agree on the B-Fast RC diff upgrades. I build my with them about a couple of months ago and they still feel great with no 'slippage'.
If however you're going to rebuild with standard issue AE parts, then probably the single most important part to change is the thrust plates (and balls if they've been run a while or been overtightened). I dont do anything extra special with mine, just AE black grease on the Thrust and AE clear grease on the main balls/plates.
As for adjustment, I've never been a fan of the 'whack it up tight, then back it off 1/2 a turn', it just strikes me you're likely to dent the plates with the initial tightening. I on the otherhand, tighten until the diff just about works, then slowly tighten about 1/2 turn at a time. After each tighten I then check for slip by locking one diff half and pulley/gear in my hand/allen driver, while trying to tun the other diff half with another allen driver. Once there's no slip while in you're hand, then assemble in the car and check for slip by locking a wheel/spur and turning the other wheel (adjust as required until no slip)
Finally.. Power up you car, with one wheel locked still, slowly (I mean slowly) apply a small amount of power for a minute or so. Then repeat with the opposite wheel locked. This will 'bed' in the diff. As a final double check, check for slippage again after the bedding in process.
i realise this might take longer, but I've always ended up with great long lasting diffs this way.
Jamie, feel free to find me at the weekend and I lend a hand if you need.
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