Almost every piece and component of the 370Z has been redesigned from the previous 350Z model. The wheelbase is 4 in (100 mm) shorter at 100.4 in (2,550 mm) and an overall length 2.7 in (69 mm) shorter at 167.1 in (4,240 mm). The overall width has been increased by 1.3 in (33 mm), the rear track by 2.2 in (56 mm), and overall height reduced by 0.3 in (7.6 mm). The smaller exterior dimensions and use of more lightweight materials helped reduce weight.
The 370Z features a front aluminum subframe, aluminum-alloy engine cradle, aluminum door panels, an all-aluminum hood, and an aluminum hatch. Front body torsional rigidity is improved by 10 percent with an extensively revised body structure, which includes a new front suspension cradle to reduce front body lateral bending, new rear structural reinforcements, and an underbody "V-bar" to help reduce rear lateral bending.
Rear body torsional rigidity is improved by up to 22 percent and rear body vertical bending rigidity is improved by up to 30 percent. Additional enhancements include the use of a carbon fiber composite radiator housing and strengthening of the rear fender and hatch areas. The new structure weighs slightly less than the 350Z.