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Old 04-27-2005, 06:36 PM   #1
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Default Freeing up TC3 Diffs

Hey everyone. Ive heard that for the TC3, you need to do some work to free up the diffs. How do you do this? Is it a complicated procedure, or relatively simple? I want to make this thing as efficient as possible before my assault on the sportsman class. Thanks!!!

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Old 04-27-2005, 07:53 PM   #2
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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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Old 04-27-2005, 08:03 PM   #3
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First you need to make sure the assembled diff fits in the gearboxes free. You should be able to turn the housing over & the diff should fall out. Some of them you have to grind some material of the side where the large diff bearings rub, top & bottom gearboxes. Then shim them. R.W.
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Old 04-27-2005, 09:12 PM   #4
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just buy the tc4 diff cases and be done with it.
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Old 04-27-2005, 09:23 PM   #5
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read through this forum

http://rctech.net/forum/showthread.php?s=&threadid=29

all you have been asking has been discussed there
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Old 04-27-2005, 09:24 PM   #6
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Quote:
Originally posted by mtc3od
just buy the tc4 diff cases and be done with it.
hey thats a better idea. since they have retooled the mold for the cases they have been nicer
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Old 04-27-2005, 09:26 PM   #7
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The TC4 diffs still take a little work...but still better than before...
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Old 04-27-2005, 09:28 PM   #8
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Quote:
Originally posted by mtc3od
just buy the tc4 diff cases and be done with it.
Are the tc4 diff cases a direct replacement for the tc3 cases?
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