what exactly is the difference in a trans brake and a line lock. and what will do better at the track.
I asked this too
http://www.foxtbirdcougarforums.com/showthread.php?t=1931
trans brake apparently holds the tranny in 1st and reverse at the same time, while a line lock holds the front (or rear) brakes. trans brake is more expensive than line lock. line lock can be used to launch or to do better burnouts without wearing the rear brakes (as opposed to power braking it)
trans brake will retain more torque. better for actually launching the car.
A trans brake in conjunction with a high stall convertor will allow you to lanch at a higher RPM. Used alone a trans brake is of little or no use. The object is to raise the RPM's to get the engine torque output to accel the mass (CAR) faster. It will also shorten the life of your trans. If in raising the RPM's, you overcome the service brakes, then a trans brake in used to control the launch. IMHO don't waste money on it for street use. Fred