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I'm not sure what line lock is, but unless the road is slanted or its wet the truck normally stays straight, and you see what my limited slip did, i don't see why everyone bashes them on here.
A line lock locks up the front brakes only, thus making burn-outs and tire warm-ups easier. They apparently also help with launches during races?
LOL, I have limited slip on my truck - or I'm supposed to. Maybe they bash them because with 92,000 miles it never, ever works anymore? Imagine this: An extended cab, long bed (4x4) truck with a stick shift... put it on just-rained-on roads in stop and go traffic, and you have the most maddening low-speed tire spins at just about every green light (even worse a the white 'stop' line is painted there). So embarrassing... like I want to spin out at each light...
I have the 8.8" rear end. Not sure if the LS's are stronger in other rears, but mine was gone before I got the truck, and now I have only one wheel pushing that large of a truck around... soemthing's wrong with the design IMHO.
I have a '97 F-150 with the Limited slip rear. One of the problem is that the limited slip system is clutched baised, which means it wears out. I also purchased my truck used and the limited slip had always "worked", but after having the rear end rebuilt (it blew up after 150,000km) and a new clutch put in, it really grabs hard now. The clutch they pulled out of the back was completely shot/worn.
Having said that, starting on a uphill with a empty truck in the rain is just as embarising with limited slip. Both tires just spin and you sit there, slowely creeping forward.
My LS works just fine with 140k on the drivetrain. I might have to make another video like that in the spring when I burn up some tires on my summer wheels.
Gamma - It does help you launch better at the track because the tire is warmed up and you clean all the dirt and crap off the tires.