HELLO,,been thru this (putting a 2 wd cab on a 4x4)yes the tranny hump is the only problem,BUT do not do like i did thinking all u have to do is change the hump,,not true,if you look back under the seat that hump run's all the way back under seat and is different clear back.(least mine was)you have to change the hump PLUS cut out that piece under seat and use the one from old 4x4 to clear the t-case..i posted some stuff about mine along time ago,i'll see if i can find it..if not if you want to go thru my post's it's in there somewhere.good luck
here is link to pic's.
http://67-72chevytrucks.com/vboard/s...54#post1439254