▁shared ▁with ▁all ▁ 1 9 7 3 ▁G M ▁A ▁body ▁cars , ▁the ▁most ▁extensive ▁red es ign ▁in ▁their ▁ 1 0 - year ▁history ▁The ▁ch ass is ▁was ▁as ▁new ▁as ▁the ▁bodies ▁- W heel base ▁dimensions ▁were ▁a ▁sport y ▁ 1 1 2   in ches ▁for ▁coup es ▁and ▁ 1 1 6   in ches ▁for ▁sed ans ▁and ▁station ▁w ag ons ▁on ▁an ▁all - new ▁st urd ier ▁per imeter ▁frame ▁with ▁increased ▁front ▁and ▁rear ▁susp ension ▁travel , ▁larger ▁ 8 ½   inch ▁rear ▁ax le , ▁wider ▁ 6 - inch ▁wheel ▁rim ▁width , ▁ref ined ▁rear ▁control ▁arm ▁bush ings ▁and ▁new ▁shock ▁absor ber ▁location , ▁new ▁body ▁mount s ▁and ▁improved ▁front ▁susp ension ▁geometry ▁- ▁The ▁left ▁wheel ▁was ▁adjust ed ▁to ▁have ▁slightly ▁more ▁positive ▁cam ber ▁than ▁the ▁right ▁which ▁resulted ▁in ▁a ▁more ▁uniform ▁and ▁stable ▁ste ering ▁feel ▁on ▁high - c rown ▁road ▁surfaces ▁while ▁maintain ing ▁excellent ▁fre ew ay ▁cru ise ▁stability . ▁Clear ances ▁for ▁spring ▁travel ▁were ▁improved ▁for ▁a ▁sm o other ▁ride ▁over ▁all ▁types ▁of ▁surfaces ; ▁the ▁co il ▁spr ings ▁at ▁each ▁wheel ▁were ▁computer - selected ▁to ▁match ▁the ▁individual ▁car ' s ▁weight . ▁Power ▁bra kes ▁with ▁front ▁disc ▁bra ke ▁cal ip ers ▁were ▁now ▁standard ▁on ▁all ▁' 7 3 ▁C ut lass es . ▁▁ ▁Add itional ▁new ▁features ▁were ▁an