Hello,
I'm just wondering where the fill hole for the rear differential is. I just crawled under the car (in the parking lot) and felt around but could not find it. Is it on the passenger side or the driver's side?

Also, I checked out the fluid in my transfer case. It looks like the ghetto shop put in the right fluid (red transmission fluid). Hooray! What color should the differential fluids be?

o yes, and I already know what differential fluid to use, just it's color... Black?

On my 98 Blazer, it's located on the passenger side right above a flange that is located halfway on the diff. I use 80W-90 which is black. Not sure what color synthetic is.