I changed my diff fluid yesterday, I just jacked up the rear, the tires werent off the ground but really close. When it started coming out the fill hole I quickly put the bolt back in (to account for it not being level). Do you guys think this is fine or should I jack up both the front and back to assure its level?

 

One way to do it is leave plug out then lower rear and then jack back up and put plug in

 

Im not able to get under the car when its all the way down

 

I did the same thing yesterday, replaced the diff fluid. Once I see the fluid start dripping from the hole, I started to lower the car and as soon as the drip slowed down, I jacked the car back up and put the bolt back on.
You are fine since a little or less of the fluid it's not going to make much different.

 

its fine.

 

I meant fill it the way you did then lower it without plug to remove excess then raise again to put plug in.

 

I did the change with the rear end slightly jacked up, but without the additional steps in post no.. 6 above. After 40,000 miles so far its all good. When I do it again in a few years I will do those additional steps however.

 

Get 2 sets of these:

https://www.ebay.com.au/itm/144718600363

About $USD35 per set.

It will get you 2-3" of clearance.

It should be enough to enable you to get underneath.

 

Seems the thread said it's fine, the indie garage 10 years ago told me it is not fine. He said the vehicle needs to be level so if you can't get under then it would need to be on 4 jack stands. At the time I think it was $40 labor to have him do it and me supply the gear oil. Today, I get it, it's likely 2 or 3X and we're all looking to do what we can and save.

 

Do it the way I said and level will be correct. As always whether transmission or differential before draining make sure fill plug can be removed.

 

but when you jack it up after letting it drain from the fill plug being level more oil will drip out

 

This is jot a difficult task by any means.
If you have the capability to raise the rear end you can also raise the front end.
It only takes a few extra inches to reach and work. Jack up the front end, put a couple bricks (example) under each front tire then raise the rear end accordingly.
If you’re skeptical enough to start a thread, there’s no reason to not do it properly.

Jack stands, ramps, etc. are ideal but I’m guessing you don’t have those…

 

I got jack stands, a jack, and a set of ramps, but the ramps are not a low profile. Also, jacking up the front of the car seems sketchy, You gotta shove the jack way back there and can hardly tell what its resting on, and theres tons stuff you could mess up if not jacked up in the right place

 

It shouldn't because angle will prevent that just like it is overfilled if put plug in after filling. Take a glass of water and tilt it backwards and you will see what I am talking about.

 

That would work if the hole was in the center of the cup, if its not then water would come out. same as the diff since the fill hole is not located in the middle.