rear drive shaft

Putting a 4 spd in my ‘71 40, with a 3 spd TC. Keeping the 3 spd brake drum. Looking for a couple of 4 spd drive shafts to allow me to shorten the rear and lengthen the front on mine. Need pinion flanges as well if anybody has those used. Thank You

Hi mud, I am going crazy these last few months and thought I'd type up my thoughts and ask the mud folks what they think. This all started after I had my local fabricator friends help me 3 link my 80. Please take a look at my notes below and let me know what you think? The Truck: 4wu 3 link...