YEP, they dont engaged as well, but like I keep on saying, a welded, a vlsd, a helical are just alternative until enough money is saved to buy a clutch type. Yes, they are more expenssive to maintain, but is a whole diff world... i have drifted cars with welded, vlsd and clutch, i must say that the tight transsition with the welded diff were a bit harsh, understeer was created, the clutch was almos the same but it was more predictible, the vlsd which is the one i have in my car sucks, but i compensate by going faster and suspension setup.