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Got my two like a week ago...
Haven't run yet but we are running and testing tonight. My 962c is pretty dialed on our track from where I last left the setup so the baseline should be prime for testing.
My first impression out of car is VERY NICE. Usually Kyosho ball diffs I consider to be the gold standard. I love their shim adjuster, etc. but they are simply gritty and spring a bit too tough unless you mess with them a bunch. The Atomic was silky smooth out of the box and the spring is much lighter. To give you an idea of range, you cannot lock down this diff so the spur gear will always turn some. What it looks like is they found a tension range appropriate for the little motors with no torque.
As for weight difference, I didn't bust out my scale but it seems comparable to Kyosho ball diff. The construction appears to be aluminum (pressure plates and adjuster) and titanium (axle and spacers) so it is not as heavy as it looks!!!
One mod I am looking at as I type is Dremeling a small opening in the axle housing to access the adjuster nut. The idea is put a finger on the adjuster nut and turn the wheel to adjust with no tools!!
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