the simple answer is that nissan's CVT transmission is made for FWD applications (altima, maxima, quest, etc) and the 7spd auto was made for the RWD based applications (370z, G37 coupe and sedan, M sedan, etc). also, i'm sure the torque rating of the CVT is much lower than a traditional automatic that's had time to evolve and become robust. the CVT actually makes a lot of sense in a FWD application since the packaging of it is, i believe, quite a bit smaller than a traditional automatic, especially a 6 or more speed auto.
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Patrick // 06 Frontier 6spd Nism osis // Mods: Uprev Tuned @ Z1 Motorsports: 257whp & 292 ft lbs
09 Pontiac G8 GXP // M6 // Sunroof // Tint... For now
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