MyG37 - 2011 g37x rack and pinion - What's the difference between RWD and AWD?

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2011 g37x rack and pinion - What's the difference between RWD and AWD?

I cant figure out the difference in the rwd and awd rack and pinion my gfs 2011 g37x rack and pinion is leaking pretty bad. I cant find many rack and pinions that are compatible also im not sure if it has 4 wheel steering. Im trying to learn all the ins and outs of her car.Any advice or links where to find rack and pinions are also appreciated Also anything i should know about her car is appreciated. And i do love cars i have a lifted f150 and a gsxr 750 just sold my 92 fox body i love working on cars!