Originally Posted by FLHX1550

That is the beauty of using the #P66 B-Fast kit. It has carbide diff balls and ceramic thrust balls. Also the diff rings are much harder than the stock AE ones. With much harder components, the life goes way up. I only have recently gone back to running AE cars, but in my 22 and my XXX-SCT, I went thru 2 diff kits per car in a year of racing. And from October to April I run 2 nights a week with buggy and one night a week of SCT.

Put it together with the right parts, break it in, and set it right, they will last 2-3 months. At that point I turn the rings over (they are softer than the balls) and it will feel like new for another 2 months. They are an exceptional value IMO.

I think that people in general try to run the diff as loose as they can, which will help rotation around the corner. But not every track requires it. That and people tend to run their slippers too tight, because they have the punch on the ESC turned up too high. All in which will "bark" the diff because it is getting too much load from the motor.

Maintenance wise, the gear diff IMO is just as much work, as the outdrives are made from softer steel and tend to get notched quickly (which can cause binding in the corners when the car rotates = push) and they tend to wear out the diff housing at a fast pace, causing more binding / leaking.