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Old 11-06-2005, 10:52 PM   #1
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Default TC4 diff problem....

am rebuilding my second hand TC4 onto a 3 racing ssg graphite chassis, and had real trouble getting the diffs to work at all!! After several rbuilds, check the manual etc, I finally realised the balls were smaller than the thickness of the gearwheel and were not making contact with the diff rings!!! Took a skim off the gearwheel in my lathe and its fine now, but surely this should not be necesary?

Anyone else had this problem?
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Old 11-06-2005, 11:15 PM   #2
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My guess, the previous owner rebuilt the diff with the wrong balls.
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Old 11-07-2005, 01:53 AM   #3
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I had the very same problem last weekend.

Just rebuilt my TC4 diffs with metal diff halves and I found that one diff worked perfect the other locked up straight away like a spool

Now from new my TC4 always had one very poor plastic diff and I guess metal diff halves just high lighted the problem more.

Ordered new diff ring gears from AE and the problem was solved.

I think AE had a batch of gears made that were just too wide, nothing to do with diif balls at all.

If you think about it a worn out plastic mould would allow a little more plastic to creep in making the gear thicker, I expect AE got a new mould made or refurbished the old one.
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Old 11-07-2005, 03:37 AM   #4
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thanks Mark, I had a rebuild kit to hand and even the new balls made no difference. Agree its almost certainly the gear that was too thick, oddly the front diff is fine!!!!

I have metal diff halves as well although even reverting to plastic ones didnt help. Took me an entire afternoon fiddling about before I solved it, I am not a fan of associated's quality control!!!!
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Old 11-07-2005, 06:53 AM   #5
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when the TC4 first came out, there were many people who had that problem. their was a bad batch of diff gears, at the time AE would replace them for you ,but i'm sure since it is second hand you just need to go to your LHS and buy some new ones.
Good luck
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Old 11-07-2005, 06:59 AM   #6
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Either that, or your trying to build the diff with the thrust balls (friend tried to do that )
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Old 11-07-2005, 07:46 AM   #7
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thanks Blackcat, worthwhile suggestion, but no, I know the difference between a diff and a thrust!!!!!

Interest about the bad batch of gears, thats almost certainly the reason......
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Old 11-07-2005, 01:03 PM   #8
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Assoc did have a batch of diff gears that where to thick and there are only two ways to fix the problem 1 is to just buy new diff gears or 2 you can dremel the excess material from the gear. I actualy did dremel my first set and they worked fine.
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