i have 4.10s in a 2000 scsb 5.3 on 35s , it does good, but 4.56 would be better especially if you were to go bigger than 35s. 75mph at 2100rpm with 4.10s
2000 Z71 scsb 6in lift, 35s, 4.10s, flowmaster, cold air intake
1972 4x4 chevy shortbed 7in lift, 36s, cammed 5.3, built 65e...in progress