Originally Posted by sschreiner5
I think they are intended for different things; the line lock is for burnouts and a trans brake is for holding the car on the line while waiting for the green light. I would guess is common to have both.
Line lock allows you to spin the tires and do burnouts. If you're on regular street radials I would actually advise against this... On street radials most people go to the track and try to put on a smoke show on street tires. Bad idea. There's a point that is very easily crossed which your tires are too slick rather than sticky. I personally drive around the water box back up to where my back tires are barely barely just in the water and then spin them briefly... Now on drag radials I have wrinkle walls and stick to the same thing but spin them a little more and will every now and then put on a pro stock smoke show just for shits and giggles... And to intimidate the little jap burner next to me lol jk. (eh seriously though
Trans brake: now from my understanding this essentially puts the car in first and reverse at the same time... Allowing you to rev the car up and go nowhere until you release it. I recommend an upgraded rearend and tranny to handle that all of a sudden back breaking power and acceleration. Basically like how nuetral dropping your car is bad, this can do some similar shit. And from personal experience I can tell you, on our cars please don't do This without subframe connectors and maybe a strut tower brace and nicer suspension... I did this to a stock car once (yeah I was young and dumb once(maybe still am)) and didn't care about the car. Had a friend write me an estimate on straightening everything out... No good. Several hours on the frame rack.
On a personal note, idk how often you have spent time at your track but this is my recommendation... Spend some time with your car the way it is and learn how it feels and moves. I know this doesn't sound big, but going from a car to doing several major mods and getting back in can be dangerous. You might as well drive a 2.2 cavalier and then go try to drive a vette. Completely different animals. I barely recognized sarge after I dropped in my other motor. I started to learn how the car seated after a launch and when to shift (manual valvebody) and stuff that I never had to think about with my 305. So get a list with your priorities and relearn the car after you cross each one off... For real.