Differential fluid capacities - 2000 GMC New Sierra 1500

I believe there is a special blue fluid for the differentials I want to say versatrac? But don't quote me. Your vehicle owners manual is the best resource for fluids capacities and bulb types. Fyi

I have confirmed the fill plug is located on the Differential cover (rear facing) Closer to the left about half way up. Although Summit after market Differential covers has a drain plug the OEM cover does not. You will need to suction the old fluid out then add the new fluid. From what I can see the fill plug is 13mm. Capacity is .7L. Used Volvo Rear Axle Fluid (API GL-5 Low friction part #1161329). Also I read that it requires one aluminum crush washer (same size as engine oil drain plug). I don't know about reusing the origional.

CAPACITIES
Engine, 2WDwithout filter..........3.5 quarts[1]
Engine, 4WDwithout filter..........4.0 quarts[1]
Cooling System, Initial Fill..........8.5 quarts
AMSOIL Antifreeze and Engine Coolant
Automatic Transmission, Total Fill..........7.4 quarts
Manual Transmission, 2WD..........4.2 pints
Manual Transmission, 4WD..........8.4 pints
Differential, 2WD Rear..........3.2 pints
Differential, 4WD Rear..........2.7 pints
Differential, Front..........2.7 pints
Transfer Case,..........4.6 pints

1. Add extra oil when replacing filter.
refill check oil level.

TORQUES
Oil Drain Plug.....22-29 ft-lbs
Transfer case
Fill Plug.....18-25 ft-lbs
Drain Plug.....18-25 ft-lbs
Manual Transmission
Fill Plug.....18-25 ft-lbs
Drain Plug.....18-25 ft-lbs

2000 TOYOTA TACOMA 2.7L 4-cyl Engine Code 3RZ-FE

Engine Oil Grade 1......API* All TEMPS......5W-30 Optional ..10W-30
Engine, 2WD, with filter..........5.5 liters
Engine, 4WD, with filter..........5.4 liters

Manual Transmission,......GL-5/ GL-4 All TEMPS......75W-90
Automatic Transmission,A340E......AF3 / A43D......AF3

Differential, Front/ Rear W/ ADRD......GL-5 ALL TEMPS......75W-90
Differential, Front Less ADRD......GL-5 ALL TEMPS......80W-90

Transfer Case,......GL-4/GL-5 ALL TEMPS......75W-90 Gear oil.

Capacity:
Cooling System, Initial Fill..........8.5 liters
Automatic Transmission, A340E Initial Fill..........1.6 liters
Automatic Transmission, A340F Initial Fill..........2 liters
Automatic Transmission, A43D Initial Fill..........2.4 liters
Automatic Transmission, Total Fill
4 speed A340E..........7.2 liters
4 speed A340F..........10.1 liters
4 speed A43D..........6.5 liters
Manual Transmission, ..........2.5 liters
Differential, With ADRD Front..........1.2 liters
Differential, Without ADRD Front..........1.1 liters
Differential, 2WD V6 Rear..........2.6 liters
Differential, 4WD Extra Long Rear..........2.5 liters
Differential, Short WB With LSD Rear..........2.7 liters
Differential, Short WB Without LS Rear..........2.6 liters
Transfer Case, Electronic..........1.2 liters
Transfer Case, STD..........1 liters

check your owners manual under fluids and capacity

There should be a filler plug on top of the diff housing, it will have a square recess that will accept a 3/8" drive extension for removal.

Standard Differential, Rear W/ SGRX......GL-5 ALL TEMPS......80W-90
Standard Differential, Front......GL-5 ALL TEMPS......80W-90
CAPACITIES: Differential, Front..........1.5 liters Differential, With SGRX Rear..........1.9 liters Saginaw rear axle has a removable rear cover without fillplug. Differential, Without SGRX Rear..........1.8 liters

ES250, ES300, SC300 AF(DEXRON-IIE (R) Automatic Transmission Fluid) Differential is serviced separately in 1990-91 ES250 and 1994 ES300.
CAPACITY, Initial Refill*:

ES250 2.5 liters 2.6 quarts
Dry fill capacity: 6.5 qt. (6.2 liters)

5.7 liter V8 Engine code 2: Fluid capasity: Engine oil with filter 6.6 liter 5W-20,  Cooling system: Total fill 13.7 liter Automatic transmission total fill 13.3 liter Front differential 1.7 liter Rear differential 2.23 liter Transfercase 1.8 liter
4.7 liter Engine code N Fluid capasity: Engine oil with filter 5.7 liter 5W-30 Cooling system: Total fill 13.7 liter Automatic transmission total fill 13.3 liter Front differential 1.7 liter Rear differential 2.2 liter Transfer case 1.7 liter
3.7 liter Engine code K Fluid Capasity: Engine oil with filter 4.7 liter 5W-30 Cooling system: Total fill 10.0 liter Automatic transmission total fill 13.3 liter (W5A580 7.7 liter) Front differential 1.7 liter Rear differential 2.2 liter Transfer case 1.7 liter.
Hope this helps, and good luck. 

Here are the Fluid CAPACITIES & MORE:
Engine, with filter..........4.6 quarts[1]
Cooling System, Initial Fill..........12.0 quarts
Automatic Transmission, Total Fill
4 speed 4L60, 60E..........11.0 quarts
Manual Transmission, NV1500..........5.7 pints
Manual Transmission, NV3500..........4.2 pints
Differential, with 8.6 ring gear Rear..........4.0 pints
Differential, with 7.25 ring gear Front..........2.5 pints[2]
Differential, with 8.25 ring gear Front..........4.2 pints[2]
Differential, with 9.25 ring gear Front..........5.9 pints[2]
Differential, Front..........2.5 pints
Differential, Rear..........4.0 pints
Transfer Case,BW4472..........2.5 pints
Transfer Case,NV136/236/246..........4.0 pints
Transfer Case,NP207..........4.6 pints
Transfer Case,NP231, NP233..........2.3 pints[3]
Transfer Case,NV231/233..........2.1 pints[3]
1. After refill check oil level.
2. Do not use synthetic lubricant in axles using RTV sealant.
Synthetic lubricant will chemically atack RTV sealant.
3. Identification: check tag on case.