Well, you will definately get better traction, and 4.10s will knock some time of the quarter mile times. The one problem about 4.10s on a 5 speed, don't expect to practically use 1st gear, as first gear would end at 30 mph, a very quick gear. And maybe highway gas milage goes down somewhat (1-3mpg I hear is common) with maybe a 1-2mpg possible increase in city, but if you're not concerned with highway milage then it's nothing. None if it exactly increase torque or horsepower, t-lok only senses slipage, then engages clutches to use the other wheel to see if you can go, and the gears only increase acceleration through ratios, but decrease top speed.