1997 silverado k2500 5.7l refrigerant capacity

most cars have it printed on decal the body under hood it will say 134-a capacity 2.3lb ,when adding Freon allways follow detailed instructions .if system has been emptied you may have to use Freon with oil in it

Total PAG oil capacity is 8 ounces if completely empty
Total Refrigerant charge is 1.6 pounds
oil replacement with just changing certain items as follows.
Compressor Replacement add 2oz
Condenser replacement add 1oz
Evaporator Replacement add 3oz
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Look for a light blue label in the engine compartment, the refrigerant capacity and oil capacity are on that label. But, being a '97, that label might be long gone. That information can also be found in a service manual. Manuals can be purchased at parts stores and you might even find one at a library. You could also call a dealer's service department and ask them.

After completely evacuating system, 4 lbs.

Short bed models have 26 gallon capacity and long bed models have 34 gallon capacity.

Tow capacity for that vehicle is about 10.000 lbs (adjusted for wear and age). This number reflects max tow capacity with good tires (proper rating and good condition) with all suspension components in good used condition. The capacity of your tow hitch must also match your load and assumes proper trailer weight distribution and tongue weight.
For best results, I also recommend that you use a good quality synthetic gear lube in the differential and synthetic fluid in the transmission, as well as a trans cooler if not so equipped.

Engine Oil with Filter 6.0 quarts (5.7 liters) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling

There is a sticker under the hood that tells you it is a 134a system and how much refrigerant it holds, and what kind of a/c oil to use. My guess is around 2 pounds, but it is an exact science. Too much or too little will cause it not to cool

5 quarts

5000lbs, but you didn't specify if it is 2 or 4 wheel drive, 6 or 8 cyl.