Currently using worn cone style in my lower power car Yes it does want o go single at times but I found by jacking around the shocks in the rear I can cheat the bad unit make it think its always sure grip just like the open rear's I used. By the way back in the 60's and 70's all the Chrysler mechanic's I knew said the cones lasted forever In my case 55 years old cone and clutches were all junk units, boy do times thinking and tech change