Please don't get under the back of the car with just the lift holding it up. Go to Sears and buy 2 more jack stands for $25 and you're good to go.

Stupid way to die if the lift fails.

 

i used spare tire jack up as safety lol
So that i just re worked on diff just now, the oil seemed to b fine.
The diff oil was clean but still i drained a lil and refilled.
AND I ENDED UP with a problem lol. i think i hear kocking(?) or pop corn making sound from diff.
what could have gone wrong? i torqued the bolt to 25ft/lbs...
If somethin have gone wrong then mayb it's from not putting in exactly amount of fluid i am suppose to...

 

good thing about changing diff fluid is you don't have to take off the wheels. I would find a slight slop that levels off. Jack up the back and secure both sides of the front wheels with either bricks or blocks of wood or something else that will provide firm support. you don't need that much slope, just slight slope to clear your drain pan. Jack up the back on the bottom of the slop hopefully leveled off. open the plug, let it drain til it stops, then bring the car back down as far as you can close to the pan, allow it to drain more completley, raise car back up and make sure everything is secure then rescrew drain plug and add differential fluid. Do at your own risk. Throwing your spare under the car while you're going to be under it is a good safety measure too.