You can get the about the same performance from a tru-trac as a locker unless you have a front wheeled jacked in the air all of the time. With the tires planted the tru-trac pulls like a train and is nicer on the street. Even if you do jack up a tire, just apply light brake presure and both tires will pull together like a locker. I've played with the tru-trac for years, it's a great unit. Unless your a hardcore rock crawler, it's all you need. I run the TT in the front and rear and it makes for one caplable off roader with good strret manors. A totally locked front and rear is over kill unless your into extreme rock crawling. If you like trail riding and enjoy driving your jeep on the street, the TT is more than capable, it also strengthens the diffs unlike the lunchbox lockers. The TT doesn't pop and jerk and still keeps the jeep street friendly while still allowing it to climb tree's off road.
1987 wrangler, 258 I-6, 5-speed.
2007 liberty sport 4X4, automatic
2009 ford ranger 4x4 FX4 OFF/ROAD, 5-speed