Gonna make this posting to see what you folks think. Been toying with a SF 14 bolt swap ( see recent post on axle swap), but this could be expensive on my limited income (I'm retired). So, what I thought of, is this. I have a 10 bolt rear from a previous C10 project ('86) that's complete, drum to drum, sitting on the garage floor. Checking on Rockauto, the drums from my '89 2wd Cheyenne have a height of 3.6". The '86 drum is the same. The axle register hole is 3.1" for both. Where I'm going with this is, because my truck is strictly a "grocery getter" ( no hauling/pulling/towing etc.), I'm thinking of pulling the axles from my current rear, taking off the 10" brakes/backing plates, and putting on the 11" duo/servo brakes and new backing plates from the '86 rear onto the '89 housing. Gonna have to check the bolt pattern on the axle housing flange to see if the earlier plates have to be changed. I would imagine they're pretty close to the earlier axle. Also, the earlier axles use a 1/2-20 stud whereas the '89 axle uses 14mm-1.5mm studs, so I'll have to open the drum bolt holes a little for stud clearance. Sound feasible? I'm sure some will say "Why not just swap rear ends?" I could do that but I don't know if the axle pads have the same spacing. Would hate to pull my rear and find the locating holes are off by a couple of inches. It'll be easier for me to just pull off the inspection cover, yank out the C clips and pull the axles. When you get to be my age (76) things aren't as easy as they used to be. It'll be a sad day when I can no longer wrench on my cars. Anyways, let me know what you think. Thanks