I have had a number of problems over the years with Ball Diffs. It's true that some are much better than others but I don't have any experience with the ball diff in the Durga (car is unbuilt on shelf) so I can't comment on it. Is it by chance the same piece that's in the Dark Impact? I did have a Dark Impact and the rear ball Ball diff worked well. The Front diff was a different story. The rear only required adjustment once in a while but the front would need rebuilds and adjustments often..

On the other side of the coin I did have the Proball in an SRT many years ago and it was a constant headache even with mild power it required a rebuild after almost every weekend of racing. The Ball diff in my B4 has also been a source of frustration sometimes requiring a rebuild after just a couple of runs. In my opinion the B4 is the worst ball diff i've come across. It works well and is nice and smooth for a pack or two but after that you need to be prepared to rebuild it.....I know other will disagree but that's my experience.

The main problem I've had with them is they tend to slip when you apply big power and eventually they get so loose that they burn up or actually melt the diff gear. This happens a lot with the B4.

I really wish Traxxas made a sealed Diff for the slash/rustler/pede as I feel tuning with diff fluid gives you the best of both worlds. I refuse to pay for the FLM piece and I refuse to add that much rotating weight to my gearbox.