Ford 4000 gas, hydraulic level check

[Patches]

A friend recently picked up a 4000 gas Ford, year unknown, and can't figure out where to check hydraulic fluid level. Can anyone help???

 

[showcattle]

There is no dipstick for the rear end. Should be a check plug on the side of the rear end. Fill until oil runs out the check plug.

 

[DLTTrekkers]

Checkplug on R side

 

[Patches]

Thank you gentlemen, I'll pass this on