Fluid Capacities for Jimmy Drive Trian

I have a 1992 GMV Jimmy (VIN: W model) 4.3L v6. 4x4. I want to use synthetics in the drive train but can’t find information on fluid capacities for the reservoirs.
The ones I can find from owners manual or Chilton/Haynes repair manuals are:

Engine Oil: 5 quarts-----------------------(4.73150 Liters)
Automatic transmission:
180C: 3 pints------------------------(1.41945 Liters)
200C: 7 pints------------------------(3.31205 Liters)
700R4, 4L60, 4L60-E: 10 pints-----(4.73150 Liters)
Transfer case:
NP 207: 2.3 quarts------------------(2.17649 Liters)
NP 231, 233: 2.2 pints------------- (1.04093 Liters)

***All capacities are approximate.

I can’t find capacities on:

Rear Differential: ???
Front Differential:???

Also, I don’t know what model Auto Transmission and Transfer case I have!

Obviously I can just drain and refill but synthetics being expensive I would like to estimate and buy the necessary volumes.

I appreciate any input on this.

It's getting pretty cold here in the Yukon so I had to jump the gun. These are approximates I’ve gathered from draining.

Engine Oil: 5 quarts---------------------------(4.73150 Liters)*
Automatic transmission:
180C: 3 pints--------------------------(1.41945 Liters)
200C: 7 pints--------------------------(3.31205 Liters)
700R4, 4L60, 4L60-E: 10 pints-----(4.73150 Liters)
Transfer case:
NP 207: 2.3 quarts--------------------(2.17649 Liters)
NP 231, 233: 2.2 pints--------------- (1.04093 Liters) *

Rear Differential: ----------1.90 Liters*
I pumped out the rear instead of removing the plate. I’m not sure how much fluid was left.
Front Differential:----------1.25 Liters*

***All capacities are approximate.

*Indicates my capacities

Still, I don’t know what model Auto Transmission I have!

u either have the 700R4 or the 4L60.

92 uses the 700r4, 4l60e didn't start on our trucks till 93 :)