I'm running a detroit locker with a 3.42 gear. The locker does it's job and is bullet proof. I'm also running a SBC and believe a 3.36 might be more highway friendly. With that said I am planning a 200R-4 upgrade with my current gear ratio that should make the car highway friendly. BTW, when the locker engages it's like running a spool...both tires hook/spin at the same speed.