with a 318 swap you will need to upgrade the rear axle to a Ford 8.8 or a Dana 44 rear. I'd got with the 4:1O's going lower will weaking the gears.
Rubicon Rich ,05 TJ Rubicon: PatriotJeepers.com
86 CJ7 258,T18,Scout Dana300,twin sticks,Dana44's,4W Disc, locked,35's,YORK OBA,Warn 8274,fullcage.
51 M100 1/4 ton Jeep trailer