. 7 2 ▁reduction ▁g ear ▁ratio . ▁The ▁N V 2 4 7 ▁transfer ▁case ▁is ▁m ated ▁to ▁front ▁and ▁rear ▁ax les ▁containing ▁Je ep ' s ▁Vari - L ok ▁differential s . ▁Vari - L ok ▁differential s ▁also ▁use ▁a ▁ger ot or ▁to ▁transfer ▁tor que ▁between ▁the ▁whe els ▁on ▁either ▁side ▁of ▁the ▁ax le . ▁ ▁The ▁major ▁advantage ▁of ▁Qu ad ra - D rive ▁was ▁that ▁the ▁combined ▁ ▁transfer ▁case ▁and ▁progress ive ▁lock ing ▁differential s ▁in ▁each ▁ax le ▁could ▁automatically ▁control ▁tra ction ▁between ▁all ▁four ▁whe els . ▁However , ▁only ▁the ▁center ▁differential ▁could ▁be ▁perman ently ▁locked , ▁and ▁only ▁in ▁ 4 Lo . ▁ ▁The ▁Qu ad ra - T rac ▁II ▁system ▁included ▁the ▁N V 2 4 7 ▁transfer ▁case ▁with ▁the ▁standard ▁open ▁front ▁and ▁rear ▁differential s . ▁ ▁The ▁ 4 5 R FE ▁and ▁ 5 4 5 R FE ▁automatic ▁transmission ▁in ▁the ▁W J ▁was ▁notable . ▁It ▁included ▁three ▁planet ary ▁g ear ▁sets ▁rather ▁than ▁the ▁two ▁normally ▁used ▁in ▁a ▁four - speed ▁automatic . ▁This ▁gave ▁it ▁six ▁theoretical ▁spe eds , ▁and ▁it ▁would ▁have ▁been ▁the ▁first ▁six - speed ▁transmission ▁ever ▁produced ▁in ▁volume , ▁but ▁it ▁was ▁program med ▁to ▁only ▁use ▁five ▁of ▁these ▁r ati os . ▁Four ▁were ▁used ▁for ▁ups h ifts , ▁with ▁a ▁different ▁second ▁g ear ▁for ▁down sh