ok i have read the thread here and i dont know what the hell you want to do... so here are your options..
1. replace the d28 ttb with a d35 ttb out of an explorer
2. find an early bronco (66-77) and use the front axle, coils and radius arms from that under your ranger
3. if you want to run leaf springs (i dont see any reason why you would want to) then pick up a set of axles from a 78-79 f-250, that will give you a d44 that is set up for leaf springs, high pinion axle and disc brakes, torch off the spring hangers, weld them back on where they need to be and enjoy the rough ride!!