thanks Phizinza for backin me up, lol, i am work on cars lol, i got my sub for 250 and like to beat the sh*t out of it i ran a est 220 shot of nos lol ( again est with fuel jet size, NOS jet size and fuel pressure) also i am running a sh*tty HHO set up and have upped my MPG from 23 average to 34 avg, again this is just a sh*tty weekend set up i plan on making a nice on lol. like i said i know you arent supposed to run 4wd on pavement, lol i aint no noob but i have seen like 3 classifieds for push button trannys with a " locking center" so that is why i figured you people on here would help clarify things, i am also currently building a LSD set up just like the phantom grip, yeah i know metal on metal and not friction discs lol o well, the diffs are like dime a dozen, and a few of my co workers ( father of one has alot of machines from his old machine shop) anyways we are in the process of fabing up a "locker" what will either of these be worth to you folks we plan on selling them but way cheaper than the phantom grip 300$,disclaimer *i have no affiliation with phantom grip and this is just a similar product not a phantom grip product and i will not say that they are a " phantom grip"