I was looking around my Front Differential on my 1980 4x4 Luv to change out the old fluid. The Rear was easy as there is a drain-plug, and a fill-plug. I can only see a fill-plug on my front differential. It's half-way up the case, just like on the rear. But nowhere a drain. I searched the list already, read through my Hanes Manual, and checked the online Chilton from my Library. Nothing in particular is on the list, and the other's just say, "change the front Differential fluid at 30,000 miles". So now the dalema, how has other's on the list changed their's when it came to routine maintenance? Do I have to try to find a Gear-oil pump to try to vacuum the old oil out? That's what I assumed, but wanted to know for sure before I try to go find one to buy. I know once emptied, I fill fluid to till it starts leaking out the fill-plug, tighten, and go. Thanks for your time and any answer's. Aloha