4.10 will yield worse mileage than the 3.73s
Unlikely with the tire size he is running.
How much worse? And are 4.10 gears 4.10 gears? Or do i gotta get em specially for a Dana 60/44/30 or rockwell or whatever. I apparently don't know sheet about this
Gear sets are specific to the differential. Sometimes with changing ratios you need to change the carrier. I know the Dana 60 has a carrier break, might be 4.10 and down, without looking it up i dont remember. The 11.5 rear requires no carrier change for the available ratios.
01 GMC 2500hd ecsb Dmax/Alli. 4" exhaust to 5" single stack,EDGE Insight CTS, EFI Live Moonshine tuned, Suncoast stage IV, Complete Kryptonite front end with PISK , 305/55/R20 Cooper Zeon's on Rockstars. Eaton E-locker. So cal stage I heads, and a little bit of laughing gas.
07 LMM LTZ CCSB. S475 over stock compounds, 40% over dipper sticks, Suncoast tranny by Freedom Diesel, Air Dog, ATP tuned.