There's a couple of things to do:
1. Make sure it is shimmed properly (tight, but not too tight) the drive pinion should butt up against the diff gear, but not put pressure on the gear)
2. You can file the gears down a bit. Take an exacto knife and trim the burrs on both sides of the teeth on the drive pinion and the diff gear. (this takes aloooot of time though) (Running the gears for a couple of weeks will accomplish the same thing naturally, you'll notice every time you rebuild your car after running it gets freeer every time). You can also shave a little bit off of the edges inside of the diff cases (but make sure you check your shimming again after doing that)
3. After you tighten the diff cases down, back the screws out a very little bit (1/10th of a turn, if even that much) and pull up on the shock tower. This will free it up alot, but be careful if you loosen it too much you'll get slop in your gears and strip them very easily.
The insanely free drive train of the TC3 is its primary strength, it gives you better efficiency (resulting in cooler motors) and more zip coming out of the corners. But don't overdo the freeness, it's very easy to shim a little too loose trying to get it free, but you'll just strip out your gears if you hit anything.
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