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Old 05-31-2010, 02:58 AM   #1
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Default Spec-R Gear/3 racing diff review

hi guys lets talk about any problems good and bad where having with the Spec-R diff and what other aftermarket parts can be fitted in replace of standard parts and what oils work the best for brands of cars.
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Old 05-31-2010, 03:04 AM   #2
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OK ill start there is a problem with the geared diff it looks like the shim in behind the crown gear compresses into the o-ring slot and then the pin comes out of the crown gear and strips the crown gear pin slot any ideas what to do as this has happen 3 out of 5 races.
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Old 05-31-2010, 03:38 AM   #3
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HK many peoples same your case !
so they keep to use NT1 Rear gear diff !
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Old 05-31-2010, 03:43 AM   #4
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Make sure that the crown gear sits fully into the slot, when building one of mine the gear wouldnt sit down fully.

I had about 6 runs in a T3, small very high grip track running 10.5 no problems so far. I have a 416 version fitted in a 3Racing Sakura, only had about 3 runs, but no problems.

In the Sakura i used 3000wt oil, this is silky smooth, but a bit too tight
In the T3 i mixed 1000 and 3000 (need to get some 2000) and it was very good, lots of drive out of the corner, a touch more steering than the ball diff, and felt like it did not unload as much through fast on power corners.

Thanks for the heads up on the pin issue though, i will keep an eye on them.
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Old 05-31-2010, 03:54 AM   #5
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Quote:
Originally Posted by Besercoe View Post
Make sure that the crown gear sits fully into the slot, when building one of mine the gear wouldnt sit down fully.

I had about 6 runs in a T3, small very high grip track running 10.5 no problems so far. I have a 416 version fitted in a 3Racing Sakura, only had about 3 runs, but no problems.

In the Sakura i used 3000wt oil, this is silky smooth, but a bit too tight
In the T3 i mixed 1000 and 3000 (need to get some 2000) and it was very good, lots of drive out of the corner, a touch more steering than the ball diff, and felt like it did not unload as much through fast on power corners.

Thanks for the heads up on the pin issue though, i will keep an eye on them.
i think to fix this a larger shim is needed to be used the same size as the crown gear because the smaller shim can easily collapse into the o-ring slot but its only a short term fix i think with larger shim.
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Old 05-31-2010, 04:00 AM   #6
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HK many peoples same your case !
so they keep to use NT1 Rear gear diff !
They use NT1 gear diff on the TRF416? Or is it just the gear?
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Old 05-31-2010, 05:51 AM   #7
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They use NT1 gear diff on the TRF416? Or is it just the gear?
t3
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Old 05-31-2010, 06:56 AM   #8
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as the NT1 diff mod fits the T3, i assume it fits the 009 aswell? if so can someone post any necessary mods or is it a direct fit?
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Old 05-31-2010, 07:30 AM   #9
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Can someone post part numbers for the Xray parts needed to make up the gear diff !!
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Old 05-31-2010, 08:15 AM   #10
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haven't gear diffs been tried before in Elec TC? If they were better than a standard ball diff, wouldn't the manufacturers already be using them?
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Old 05-31-2010, 08:35 AM   #11
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They work a treat in mod and faster stock classes when running on asphalt.
Also no more diff rebuilds and failures.
Been trying to get a Serpent gear diff for a while now.
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Old 05-31-2010, 08:39 AM   #12
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Quote:
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Can someone post part numbers for the Xray parts needed to make up the gear diff !!
Found it p/n 535000 complete front gear diff.
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Old 05-31-2010, 08:47 AM   #13
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Quote:
Originally Posted by jonest View Post
They use NT1 gear diff on the TRF416? Or is it just the gear?
yes use 416 pulley mod. !
& next week have new for tamiya diff cup in NT1 rear gear diff to use .
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Old 05-31-2010, 08:47 AM   #14
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Quote:
Originally Posted by Team-RTR View Post
as the NT1 diff mod fits the T3, i assume it fits the 009 aswell? if so can someone post any necessary mods or is it a direct fit?
Yes fit !
u can see T3 topic had posted some photo ago
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Old 05-31-2010, 09:13 AM   #15
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Parts in the post here. Pics a few posts further down. Looks like a total hack job.

http://www.rctech.net/forum/electric...ml#post7120864
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