I have 4.10s, and I take around 2k rpms going 70mph. I assume with 4.56 you would take around 3k rpm. Definetely worth it if you are mud boggin/hauling stuff.

 

When I ran the calcs on my truck, for 33" tires, the difference between 4.10's, and 4.56s at 65 mph was only like 200-300 RPM......

 

OP has a lot to think about.

 

i dont do much hwy right now but looking to go from florida to oklahoma soon and i do not haul or tow often but will be towing my car when i go. unless i find a delivery job that i can use my truck for lol.

 

If you don't tow or go 4 wheelin' there's really no need to drop $1000 on a gear swap.

If you do decide to get gears, go with the 4.56 . I put 3.73's in my mustang, and when it was all done I wish I had gone with the lower 4.10 gear. What I'm trying to say is, whatever gear you THINK you want, go with the next step up and get the lower gear lol.

 

I'm at about 2200 rpm at 60mph with 265 tires and 4.56 gears. I am getting about 10mpg on average. Power is great!!

 

That is great advice. I don't think that 4.10 gears would have been a good choice after running the 4.56 gears...