Gears I would do 4.10s or 4.30s. I wish we had that in our 02 F250 but the 3.73 Limited slip does fine but we are running 285 75 R16s but we do pull heavy loads to. I want to upgrade the transmission cooler on ours too. I belive if you get a tuner then it will do great for shift points on the transmission. Everybody here recomends the Mikes 5 star tuner but we don't have that we have the Bully Dog Chip and it does great.
Alaska prices are spendy for anything... but three and a half large... but that was for everything installed, new seals, new bearings, new gears and a new locker. Actual gears were only $259 each set and the locker is 807. Bearings and seals were another 500... you get the idea... a little less than half was Labor.
Ouch.. I've got to get a bid for that exact swap, was hoping you'd say closer to 2
I have a '08 F350 crew cab, long bed with 275-65-20" tires which are 34.2 inches tall. I have the 4:30's and sometimes wish I had 4:56's especially when towing, just for that extra oomph. Personally I would go with the 4:56 gears.