Gear diffs Vs ball diffs
Advantages:-
1) don't slip and can not come undo during a run (although the seals can give up and the oil empty changing the feel)
2) a definite adjustment, 10 people build 10 diffs with the same brand of oil all will feel almost exactly the same .. 10 people builds each build a ball diff your likely to get 10 different feelings ... makes transfering / recording set-ups easy
Disadvantages
1) weight (not too much of a problem these days)
2) limited steps to the adjustment (whatever the oil weight steps are)
3) longer to adjust (have to dismantle the car, depending on design that can be a PITA .... trust me .. not something you want to be doing 5mins before your run)
4) messy to adjust (trust me .. not something you want to be doing 5mins before your run)
5) can make one hell of a mess if a seal goes ... usually a full strip down to get everything washed clean!
I've run with both types (in both 1/8th and 1/10th as I am old enough to remeber the geared diffs in 1.10th Kyoshos & Tamiyas and ball diffs in 1/8ths, mainly on-road) and to be honest if I was designing a competition car these today I'd use ball diffs in 1/10th but geared in 1/8th (purely because they 1/8th cars put a lot of load on a diff and ball diffs are harder to make stand such loadings.
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