@Tankcruiser I will do a more thorough write-up but just wanted to get you started.
The front differential outer seal part # is : GM 19257296
The front differential Inner seal part# is : GM 12471617
The outer front diff seal behind the LF CV axle can be installed with a regular flat-base seal installer. The inside seal between the diff and oil pan cannot. There is a raised portion where the intermediate shaft enters and using a flat-base installer will damage the seal.
The rearmost differential mounting bolt is a real peach. You will need a 18MM wrench and will likely need to remove the cross member under the steering gear. The cross member is easy, but observe all the small 15MM bolts that face forward, you can leave two of them, I believe the outer most bolts.
The cross member houses four 21MM bolts that secure the lower control arm brackets. Those require 177 foot-pounds so you will need a big torque wrench. Don't hammer away with an impact to tighten, don't risk breaking loose the welded nuts. Those bolts also keep the frame from sliding in the lower control arm when braking, ask me how I know......alignment shop's fault.
Also this is important, there are two short 15MM bolts that mount in close proximity to the high pressure lines of the PS gear, don't use the long bolts there.
Maybe you can get the diff to turn over once removed, I had to unbolt the A/C compressor and move it forward.
If you have over 140K miles on the front hub and bearings, I would replace those while you are at it.
When you pull the diff seals, observe the small roller bearings of the bearing adjuster just past the seal, make sure they are all there and in good condition.
The seals need to be flush when installing, the last 10% is where you have to beat on them a little as the tabs fold over inside the seal.
I'll add a few pics later from my cell, hope this helps.