▁design ation ▁of ▁" Z G ". ▁ ▁Eng ines ▁ ▁Production ▁Num bers ▁ ▁Second ▁generation ▁( W J ; ▁ 1 9 9 9 – 2 0 0 4 ) ▁ ▁La unch ed ▁in ▁September ▁ 1 9 9 8 , ▁the ▁red es igned ▁W J ▁ 1 9 9 9 ▁Grand ▁Ch ero kee ▁shared ▁just ▁ 1 2 7   parts ▁with ▁its ▁prede cess or ▁( most ly ▁fast en ers ). ▁The ▁European ▁model ▁was ▁c oded ▁W G . ▁The ▁spare ▁t ire ▁was ▁re located ▁from ▁the ▁side ▁of ▁the ▁cargo ▁compart ment ▁to ▁under ▁the ▁floor . ▁( Like ▁the ▁ 1 9 9 8 MY ▁Z J , ▁the ▁rear ▁tail gate ▁glass ▁opened ▁separately .) ▁The ▁two ▁heavy ▁push rod ▁V 8 ▁engines ▁were ▁replaced ▁by ▁Ch rys ler ' s ▁then - new ▁Power T ech . ▁The ▁new ▁V 8 ▁engine ▁produced ▁less ▁tor que ▁than ▁the ▁old ▁push rod s , ▁but ▁was ▁l ighter , ▁offered ▁better ▁fuel ▁economy , ▁and ▁provided ▁similar ▁on ▁road ▁performance ▁figures ▁( the ▁ 2 3 - g all on ▁fuel ▁tank ▁was ▁replaced ▁with ▁one ▁of ▁a ▁ 2 0 . 5 - g all on ▁capacity ). ▁The ▁straight - six ▁engine ▁was ▁also ▁updated . ▁A ▁red es ign ▁of ▁the ▁int ake ▁manifold ▁added ▁. ▁While ▁other ▁Je ep ▁vehicles ▁used ▁the ▁M op ar ▁ 5 ▁x ▁ 4 . 5 ▁b olt ▁circle ,