8 3/4 vs 8 1/4 weight

Both have 3" axle housings, use the same backing plates, drums, same shock mounts, I think you'd be lucky to save 20 lbs, probably less. IF you really want to save weight, go to the 7.25. I just did a weight by weight comparison of the 7.25 vs 8.75 and the weight is pretty substantial....... so is the strength