new to the club

i have a 97 & 80 model jeep. both have 4in lift. 97 has a 4 cyl. and 33 no power. what gears would u prefor or would u change motor? only has 70,000 mileson it. the 80 so far i have redone the frame. it has 2 piece rear axles junk they keep breaking does anybody have a fix 4 it? it has a 304,33tires thanks 4 any feed back.