it could be jsut the opposite as to which tire breaks loose, it completly depends on which tire has more traction, typically in a one wheel burnout scenario you sitting in the drivers seat has enough impact to get the right rear to hold while the left spins

also for the gen public a good FIY is that in a one wheel spin your speedo says 30 for example, your like ohh wow cool im doing a burnout at 30, but really since only one tire is spinning its double the speed so its spining at like 60, (mph or km/h is completly up to you, use what ever your comfertable with), your differential is made up of spur gears , and is suppost to turn as one solid unit untill you start to turn then one tire slows down while the other tire makes up for the speed difference, total tire speed is always what your speedo says x2 [between the 2 tires] so if your going around a corner doing 40, the inner tire slows down to say 30, your outer tire speeds up to 50, in a straight line your tires would return to doing 40 each.. the diff being of spur gears, 2pinions and 2 planets (some people call them different names sometimes) well your crown turns and your planets turn with it, the pinions connected to your axle shafts are what drive the wheels, when one pinion stops the system doesnt stop in its tracks, the planets actually start to turn around the stoped pinion, and through gear multiplication that tires spin is transfered to the other tire, and since your rear end isnt a torsion (which is a style of helical type gears that make up your rear end) each tooth on your spur gears slap each other, and a highspeed one wheelburnout can lead to your detenating your rear end, with an LSD you dont have to worry a clutch type system engages when theres noticed tire spin, which enages the other tire so now the whole diff can continue to turn as one solid piece, so you dont have to worry about detenating your rear end. if people have the money get a torsen rear end, helical style diff, no gear slapage, when one tooth is released the next gear is grabed gradually, it sorta walks itself...

google some pictures of open style diff, LSD, and torsen put what i said into imagination, its really cool!

.. lol after 30 sum min of looking i found it

 

I have to say I know that by experience, I blew out the rear end in a 1999 F-150 because of that, from burning out in a parking lot. Needless to say I could have done without the 1,400 dollar lesson. The smoke and everything was fun but definitely not worth it, haha.

 

that really sucks the big one...

 

Ok... lets get one thing straight. Air lockers are not for just front wheel drive vehicles. ARB is the most common air locker and they make one for about any rear end. Also, like you said you don't really need an air locker. If he wants to be able to unlock or lock it with the push of a button, he should go with a Detroit Ected. Its an electronically actuated locker. But if it was me, I would go with a detroit True-track because it is a posi but it doesn't have clutches that will wear out and it doesn't take a special lube. I do a lot of 4-wheeling and I actually bult my own 46 ****** with a 4.3 chevy, and dana 44 axles in it both of which are locked. When it come to traction aids that is one of my srong points. Whichever way you go... if it had "Detroit" on it then it is a high quality Item and you will be 100% satisfied with it.

 

DONT back up and throw it in drive to burn out! you will be putting a new tranny and rewar end in it if you do!

 

Thats not power braking!! Power-braking is when you hold your foot on the brake and burn the tires by applying gas with your right foot. I can only do it in an auto but I've seen many do it with a stick. Hurst makes a thing called a Line-Lock, it locks the front brakes and not he back so you can do extremely good power brakes. DON'T EVER BACK UP AND THEN THROW IT IN "D" (OR 1ST)!! Do you know how bad you can mess up your car? Twisted driveshafts and torn-out rearends and don't forget stripped gears in your tranny!! Are you stupid?

 

yeah who ever does teh back up thing , has been lucky he has no repairs yet...