Sorry, to such thing, at least not for an automatic. You have to pull the pan and replace the filter and gasket if you want to change the Transmission Fluid. Note that you don't get any of the fluid out of the torque converter when you change the transmission fluid, so it's just a partial fluid change.
Standard or automatic?
No drain plug. Filter is located inside the transmission pan on the bottom of the tranny.
Replace the drain plug gasket and don't over tighten it.
the size of drain plug and the oil level check plug is 17 mm on s-10 1999 manual transmission
To drain the oil on a 1991 Chevy S10 Blazer, located the oil pan drain plug. Use a wrench to remove the plug and the oil will flow into the receptacle you have provided.
On the transmission, right side just above the drain plug. Fill it until it's just below the filler port
The wrench size should be 15mm.
The drain plug would be at the lowest point under the engine. It will take a 15mm wrench to remove it counterclockwise.
The original engine oil drain plug wrench size would be 15mm.
The oil drain for the engine is located at the lowest point on the bottom of the engine oil pan.
The drain plug is at the bottom passenger side of the radiator. It takes a 1/4 inch extension to fit into the head to turn it.
Bottom right corner on the radaitor. It's there just hard to see.