Small update. I pulled the wheels off my truck and got the mounting flange measurement from the Dana 70.
Dana 70 Dually axle measurements:
Leaf spring centerline measurement is 43 3/16”
Wheel mounting flange is 72 ½”
Wheel offset is 7 7/8”
2003 (Drum brake) Dana 80 Dually measurements:
Leaf spring centerline measurement is 43 3/16”
Wheel mounting flange is 72 5/16”
Wheel offset 7 7/8”
Which means, the wheel mounting distance on the Dana 80 is 1/8” narrower than the 1st Gen Dana 70 and not enough to make any difference.
And since the wheel offset measurements are the same, the tire foot print will be in the same place they are now and the tires will not rub the inner fenders or stick out any further than they already do now using the stock truck bed.
1998 Freightliner FL70 Crewcab, Cummins 8.3
Sold
1992 W350 Clubcab, Getrag
BHAF, Stans 4" exhaust, H1C, GDS 60mm, 16cm housing, tweaked pump, Kdp, Autometer guage package.