Yea thanks for the realization of the community here and im sorry for my ignorance but i have tried navigating thru the website to try and find answers why do you think i signed up for the god forsaken website the amount of ads on here are numbing i see why you guys are this way. But i don't think i belong here im probably better off scouring the internet to answer simple questions at least my slang and lack of grammar would be understood instead of criticized. But you guys do your thing here. keep it rolling.,.
Premium gas? no, you dont need to put premium, but thats a debate in itself.
What model you have? Well, all LCs are "base" with the same engine. Yours is a 99, which some came with Rear lockers.
I still do not know what you are asking here. Does your LC have problems? Curios about a feature? Most if not all have been covered, and you can search it here or on google.
The FAQ here and that SLEE link is a great way to start reading.