Ok,,, Looked at your pics on a full size computor screen instead of my 2" phone. You have a 10 bolt front with 8 lugs, this was used in the later 80s on the 3/4 ton trucks. Likely you have 3:73 or 4:10 ratio. SO DO NOT PUT IT IN 4X4 untill the ratios are confirmed the same. (ok thats my disclaimer) Now back to the meat and taters. The rear is a semi floater (SF) 14 bolt that is differant than the commonly refered to 14b. The semi uses a 9.5" ring gear and the common "full floater" (FF) uses a 10.5 ring gear. Easiest way to clean up the rear is to find a FF 14 and swap it in. as there are thousands in farm trucks and junk yards nationwide. Otherwise, ordering parts for the SF 14b will always be a bastard child. your not going to kill it as I will stand up to alot of abuse, but parts, lockers/ etc will always be a special order and $$$.
Now,,, the front.. You will likely have to take the end of the brake hose that hooks to the caliper and drill it out, the reason is that when moving from half ton to 3/4 ton the banjo bolt diameter increases. I have had to do this for years on the bastard truck I have as the lines were for a 2wd and I put a 3/4 ton axle under it, then put a 1 ton dana 60. Dont worry about drilling out the center bolt hole, your not taking anything major out, and pump a little fluid through to make sure its cleaned out...... If you choose not to drill, you will be making plenty trips to the parts house to match up a hose that will work... Just remember that you mating to a late 80s 3/4 ton GM front 7" caliper.
