I can't recall if I trimmed the tabs on mine or not. I actually use them on my Viper to help remove and install the trans though. They have holes in them, so my dad and I made up some brackets that bolt to our transmission jack and reach up and locate in those holes to lift the trans by the tabs. The bottom is anything but flat and isn't symmetric at all, so it likes to roll around on transmission jacks. The tabs do a nice job of letting the adjustments on the jack actually do something. I think I recall using at least the front ones on my Dart for that reason, but I might have trimmed the rear ones for clearance.