The true name for a line loc, is roll control. its designed to keep stick cars from rolling out of the starting lights at the drag strip, its not made to hold the car under power, I have never seen one on the rear brakes. to hold the car under power, we use a trans brake. it holds the trans in 1st and reverse at the same time, untill you release the button. now thats a good time

 

I agree totally. But it does help keep from cooking the rears in the burnout box.

 

line lock needs to be on the wheels that arent drive wheels. i installed 2 on my f350, 1 front 1 rear, but its for a parking brake. i dont think any axle could handle a brake stand with my tires