Walker is also real here. After riding in and driving Bro John’s 350/ALASKAN rig with 3.73’s at length over steep hills and across the fruited plain, I have come to the conclusion the best overall gear ratio for an F-350 SRW SC SB or CC LB that carries a medium weight truck camper (2500-2900 pounds dry weight) is…..
4.10 or 4.11:1. Bigger size pinion. Sturdier ring gear. You can get lockers and limited slips.
The only problem is Ford does not currently offer that gear ratio in an F-250-350. I think in some F-450/550’s (maybe) you can get 4.10’s, but their stock ratio is around 4.56-4.88:1.
Mind you, I still like the 4.30’s with the gasser and my driving style.
2020 Ford F-350 XLT FX4 4WD SRW SB SC 7.3L Godzilla Gas TorqShift 10R140 397 amps dual Alt dual batts Frnt Dana 60; Rr Dana M275 E-locker 4.30's 4580/4320/4066# payload 7243# curb wt. 11,300# GVWR 5-er prepped. 2020 Northstar Laredo SC, 12v compressor fridge, cassette, 320w Solar sub zero insulation.