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Old 10-06-2014, 10:09 AM   #1
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Default tc4 gear diffs????

Do they accually exist? If so, where can I find em?
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Old 10-06-2014, 10:41 AM   #2
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No they don't exist, but you can try retrofitting another car's gear diff to make it work..... The ball diff works fine in the rear with a front spool or gooped(ofna diff lock lube) steel front diff....
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Old 10-06-2014, 11:26 AM   #3
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I think the TC4 is pretty much the same as the SD from Yokomo (in its various incarnations). And no, the SD doesn't have a gear diff either. Nor can you directly use something from something else as far as I know. And believe me, I've tried.

The only thing that worked was to machine down a bit of the housing of the TB04 (or EVO6) Tamiya gear diff and strap the SD crown to it. The pinion needs a bit shaved off the tip as well to clear the diff housing. I guess you can try to use the Tamiya crown and pinion as well (so no need to machine the diff housing), but you'll have to modify the pinion to fit the SD input shaft or adapt some Tamiya input shaft if there is one that can be adapted. This is not sure information because I am not sure the relative positions of the pinion and crown from Tamiya will mesh correctly in the SD gearbox. In principle they should.

The issue that concerned me is the Tamiya plastic (or reinforced composite) seems to be a bit crappy (or not as good as the Yokomo plastic).

A benefit would be if the TB03 pinion/crown could be used because that would bring the internal ratio down a tad therefore pinions/spurs of a more terrestrian size could be used (especially in spec classes). Not that big a deal though.

I have a couple on order and will try to bodge some more to see what I can stir up.

I may or may not post the outcomes.

Hope this helps.
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Old 10-06-2014, 11:30 AM   #4
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tc4 and b44 share a lot of diff gear parts, I would bet you could use the conversions for durango diffs that we have been running in the b44's
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Old 10-06-2014, 11:34 AM   #5
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The Durango diffs are humongous, they won't fit in a TC car gearbox, trust me, I have two Durango offroaders. Nor will the B-Max4 diffs or the Xray buggy (whatever that is) diff.
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Old 10-06-2014, 11:57 AM   #6
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The new B44.3 comes with gear diffs, being they are the same transmission wise...
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Old 10-06-2014, 08:50 PM   #7
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They look huge as well, can you measure the outer diameter of the crown for us?
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Old 10-06-2014, 09:13 PM   #8
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Only one guy did the gear diff mod, and it was a lot of work....
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Old 10-06-2014, 10:41 PM   #9
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Quote:
Originally Posted by bertrandsv87 View Post
Only one guy did the gear diff mod, and it was a lot of work....

Are you talking about me or someone else?

What gear diff did he use?
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Old 10-07-2014, 12:27 AM   #10
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Don't we go through this exercise about every three months????
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Old 10-07-2014, 12:40 AM   #11
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I am talking about Jeff's modded lightweight Top Photon gear diff ....
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Old 10-07-2014, 01:14 AM   #12
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Is that made with one of these:

http://www.rcracinguk.com/bmz_cache/...ge.150x112.jpg

If yes, I had a look at it but I am not satisfied with the build quality of that. I bought two of these for evaluation and they came prebuilt with some very sticky oil inside. Looking at the way they seal, I am not confident they wouldn't leak should you use a lighter oil.
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Old 10-07-2014, 01:24 AM   #13
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Quote:
Originally Posted by THEBIGBULL View Post
Don't we go through this exercise about every three months????
Three months ago my mod was not done, so there you go, you've got some new developments to report wherever it is you go through this every three months.
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Old 10-07-2014, 04:13 AM   #14
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Quote:
Originally Posted by niznai View Post
They look huge as well, can you measure the outer diameter of the crown for us?
I'll ask and report back.
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Old 10-07-2014, 04:30 AM   #15
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Thank you.
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