Ok I have never changed out front diff oil my bad. Figure these parts do not spin unless I am in 4x4 so how do I go about doing job? I quickly looked under there all I saw was big steel plate with 2 bolts.

They are always spinning when moving, they're just not under load in 2wd. The steel skid plate will have 4 bolts total to remove, then you can drop it down. Remove the fill plug on top of the diff, then the drain plug at the bottom. Refill to just below the lip of the fill hole. Buy two quarts of whatever's in the manual and you'll have some left over.

_________________
05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

Anyone else ever notice that the oil drained from the front diff always appears significantly contaminated/black, etc?

The used oil from my rear diff always looks like I just put it in.

Regardless of weight used (at 15k)

_________________
06 CRD Limited. IMII, GDE TCM, Carter transfer pump, Upgraded oem primary, 2 micron secondary, 3 inch mandrel straight pipe.
Transgo shift kit, EHM, fcv butterfly removed, egr plated off. 19 3/8 solid flex fan, no electric fan, 10k lb aux trans cooler.
Frankenlift II, Mopar skids, allj's rails, 235/85 km2 on stock rims

Small diff(less oil) and covered by your skid so does not cool as well as the rear diff.