I'm rebuilding the 700R4 in my '84 K5. It's a stock 350, soon to be supplemented with headers, 3.5 inch exhaust and a 2.5 inch lift with 33 inch tires. I'm just going to regear the 10 bolts cause they will be plenty strong for as hard as I'm going to run it(it's for hunting, badweather driving, the dunes, an ocassional mudding session and amateur trails). My buddies and I have ran plenty of Dana 44s, 10 and 12 bolts hard in this same manner and have never had problems. I don't want to go through the headache of 8 bolt wheels cause I simply don't need that kind of strength. If they made 4.30s for 10 bolts, thats what I would go for, but they don't! Since I'm going to regear, the obvious choice was 4.10s, but I got to thinking about maybe going to 4.56s since I have the overdrive. What do you all think? The motor will at the most someday have 300 horsepower, but not likely. Probably closer to 250-275... I just want something reliable that isn't likely to get stuck and will climb snotty hills and logging roads.