well i dnt know if this will help but i just put 14s and power balls on mine and i get a pretty high lock u. but in order for me to get that high lock up.they had to xtend my uppers trailing arms 1inch. it make a big differencein the high cuz i had 10s b4. but when i lock it up i can fill the drive shaft grinding. its cuz the drive shaft is being push into the tranny and also the u joint from the axle is binding. i plan to put a slip yoke on it soon. shud stop that shit. ill try to post pics of my set so you can see.
i did adjustable uppers and 5" dropmounts and i got like 4" of lift extra but the drive shaft does bind,def getting a slipyoke next.i have 14's and can stretch them alll the way out but i need more coil to take advantage of the extra suspension travel