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Old 06-21-2013, 03:36 AM   #1
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Default Spec-R gear diff gears wearing out

On a previous car, I had to replace the gears in a Spec-R gear diff. Last night the front diff on my sons car went aswell. Has anyone else had problems with the gears wearing ? I've ordered the carbon ones to replace them, but I don't think that the gears should wear out after only about 5 months use. Weren't gear diffs supposed to replace the maintenance needed for ball diffs ?
VBC Wildfire D08, Yokomo BD7 RS, Schumacher Atom, Tamiya M03, M05 (outdoor Mini), M03RWD, MF01-X, BSR M-Rage, ABC Gambado, Associated TC4 (outdoor car).
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Old 06-21-2013, 04:26 AM   #2
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maintenance free doesnt meen that they last forever
changing gears after 5months are perfectly normal

a balldiff needs rebuilding after every practice session, or more often if you want it at its best, thats a BIG difference in maintenance
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Old 06-21-2013, 08:55 AM   #3
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Yes, 5 months from a set of gears is normal. If you Mod they won't last 5 months. You can get the gears to last a little longer if you check and reshim the gears to reduce lash as they wear.

Gear diff are no less maintenance intensive than ball diffs if you are a serious racer. That they offer is higher poerfomance than ball difs in some conditions. In others ball diffs are faster.

I rebuild Gear and Ball diffs once a month. My ball diffs would easily last a month of weekly races.
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What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
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