Gears...

[PDXDave]

What ring and pinion ratios are you guys with the 6.0 running with 35's?
I want to regear and swap to an ARB in the rear...

[Big_ern_101]

6.0, 37s, 1 mile of lift and a CCV pop top running 4.30s. Seems real happy for mainly freeway pounding and gravel roads. Gets around 15 MPG in mixed driving.

Using some napkin math, 4.10s would be perfect for you with 35s.

To be frank I could use some deeper gears off-road, but I would probably just change to a transfer case with more reduction or get a doubler if thats what has to happen.

[PDXDave]

Copy that.
That's pretty much what I was thinking, and with the Atlas T-case, we can change out the low gear set easy enough for more reduction off road.

[Nrobert10]

Not sure if this helps since you asked about 6.0’s. My 7.3 running 35’s with 4.30’s seems good on-road and gravel roads. Like Big stated wish I was geared lower for any off-roading

[Twoxentrix]

You should take Van weight into account, and if you plan on towing.

I run 4.56 with 35's (also have dash controlled ARB lockers on both front & rear), BUT my van weights just shy of 12k lbs so that extra gearing works in my favor.
I find this combo good for long uphill grades since it keeps me from having to downshift (i remain in overdrive as well). The offset is I run 2300rpms to do 70mph. The extra rpms increase your drive train temps a little (this has been addressed through several other mod's), but they also help keep the EGT's down while under load.
I rarely ever consider gas mileage, but occasionally check just to see if I encounter any large deviations from my norm. Really doesn't matter if I'm on flat land, or mountainous areas, I've been consistently between 12.5 and 13.5mpg...and I tend to drive with a heavy foot. YMMV.

[PDXDave]

I'm 10.5 loaded and I'm waffling between 411's or 456's
My 96 Landcruiser is on 315's and it's running 488's with no complaints, but it also reveals a lot higher than a 6.0 psd

[JoeH]

I have a 6.0 in my 10,500lb rig and have 4.10 gearing with 35s. 2000rpm at 68mph. If I had a gasser I might prefer 4.30 or 4.56 for a bit more torque but it's not needed with the diesel.

[Vanimal]

7.3 on 4.30 w 35's.

[SteelheadJones]

Vanimal that’s the combo I’m planning. How do you like it? Have you made any mods to your 7.3?