I can say that the Kyosho diff uses standard size balls... I replaced them myself thinkin they might be out of round. That may or may not be important. I would think that more balls is better since the load would be distributed along more surface area.
I'm also not a huge kyosho diff fan because I had to add more shim to my motor, but I seem to be the only case of this.
I could only get a Kyosho ball-diff.
I am thrilled with it, best hop up yet for me..
As for the amount/size of the balls within the diff, this is one of those arguments from 1/10 scale racing days, although 1/10 scale ball-diffs are slightly different as it uses wafer springs and has recesses for the thrust balls in the pressure plates of the diff. A heavier duty ball-diff overall!
I personally came to the conclusion that it's six of one and half-a-dozen of the other. The same!
Kyosho use 5 or 6 thrust balls of a larger size. GPM use more for a smaller size. I think it works out the same.
The upside is that GPM have different sized spur gears, but I ask the questionas to whether anyone would use them?
Most tinkerers make adjustments on the pinion gear as it's simpler.
From 1/10 racing I know it can be hard to keep track of the various spur/pinion combinations that work best!
I think buy what suits ytou best, price, availability and backup.
One thing I do know, is that every little part of the Kyosho ball-diff can be purchased seperately. Can GPM's ball diff be ordered in parts?
Would anyone want to replace a diff if they only needed a solitary part for it? I wouldn't!
I use the spur gears alot actually If you have the stock motor mount, using the 40T spur will let you fit up to a 13T pinion, where if you leave the 42T on, you can only fit up to about a 10T.
The K ball diff has worked out nicely since I added a little (1/32 inch) of shim to it. Even raced and took 2nd, 1st, and 2nd in the amature league last thursday with it! I don't know why my diff was oversized but it seems to be fine now that I added the paper shim in.
[03/22/17] MZR was on vacation, didn't... : All kidding aside, the host experienced a bit of a server meltdown last week and efforts to restore the site to a new server took longer than anticipated.
The current server is temporary until - more»
[11/25/15] Did You Hear? Our Black... : Hey Racers,
We're getting started a bit early with our Black Friday sale this year. Generally we're not supporters of retailers opening early on Thanksgiving, but in our case, we're - more»
[06/30/15] shop.tinyrc.com: Have You... : Hey All!
Just a quick reminder to everyone that we post all of our shop.tinyrc.com Newletters here on the MZR Forum. If for some reason you miss them in your email inbox, you can always see the - more»