It is a rubber plug in the front cover.
Just fill it until the lube runs out the fill hole. It is now full.
The front differential is an "open" differential. No limited slip components there.
Unless you have a 4x4 or 6x6 unit, there is no front differential.
The front differential uses 80w90.
I have a 1999 dodge durango 4x4. oil was shooting out through a hose that came on the front axle I know that oil has
All Ford Rangers have a rear differential , and if they are 4X4 equipped , a front differential also
On a 2004 Ford Expedition , 4x4 : The front differential has a tube ( hose ) coming off the top of the differential ( the biggest part of the case where the gears are )
Dana 35
My 2001 durango slt plus 4x4 has 9.25 rear axle and 8.25 front
32mm
Your front end will clunck and bang and lock in 4x4,and may completely lockup.
85W90 gear oil.