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Spec-R Gear Diff in the M-05 Mini

Spec-R Gear Diff in the M-05 Mini

Old 10-16-2012, 05:04 PM
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Default Spec-R Gear Diff in the M-05 Mini

I've run the TA-03 ball diff in my M-03 and recently in my M-05 mini for years and I never had much to complain about. Built right with AW grease and tightened properly they last forever.

When Spec-R came out with their new gear diff for the M-05 I was pretty excited. I run one of their gear diffs on my FF-03 Pro with excellent results and thought that the one for the M-05 would be just as good.

I bit the bullet and ordered one directly from Spec-R. On arrival, I wasted no time with the install and went racing. The thing lasted one race day before one of the internal main gears snapped in half along with the steel washer. The diff is destroyed and I must say I'm not impressed. The outer housing, main O-ring and the diff outdrives seem fine but the remaining internals are junk. The main housing might also be ruined as the gears ground themselves into a paste with the silicone diff fluid. What a mess.

Anyone else had any issues with these gear diffs?

Last edited by SteveM; 10-16-2012 at 06:52 PM.
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Old 10-19-2012, 06:26 AM
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I've since sent Spec-R two messages and haven't had a single response. Not great customer service and I'm not impressed. I went back to the TA-03 ball diff for now.
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Old 10-21-2012, 06:17 PM
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I received an email from Spec-R today to thank me for using their products and also to say they are sorry that I experienced an issue. I was offered free shipping for replacement parts. Sadly, the diff was a complete write-off with the exception of the two out drive cups. Not not of an offer considering the $50 price tag.

I can not recommend the Spec-R gear diff for the Tamiya M-05. It's too fragile and much too expensive for even a silver can motor.
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Old 10-21-2012, 07:49 PM
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Spec-R gear diffs in FF03s have also had reliability issues with the internal gears. Count yourself lucky yours has been reliable.

Purchase the 3 racing gear diff as more robust than Spec-R. Fits the M05 and M06. Use a heavier weight oil than the one provided. The out drives will wear after a lot of use and are available as a spare part.
http://os.3racing.hk/products.php?products_key=5321
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Old 10-21-2012, 09:48 PM
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The ball diff with ofna diff lock lube is the way to go!!!! It will start very tight, and loosen itself over time , giving the performance of a slipper spool, that won't break in hard crashes....
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Old 10-22-2012, 05:46 AM
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I was using the TA-03 ball diff built with AW grease instead of traditional diff lube and tightened as tight as I could get it and blue Loctite to keep it that way. I have had excellent results with this diff, but when the Spec-R unit was released I thought it was worth a try. Big mistake unfortunately.
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