The starter solenoid is located piggy back on the starter.
It is in the transmission itself.
The shift solenoid on your 1994 Chevrolet Blazer, is located on the top of the transmission. The solenoid will be labeled.
Inside the transmission, just above the pan.
Behind engine, bolted to transmission.
It is on/inside the starter.
The starter solenoid in on the starter
The solinoid is located on the top of the starter. Generally the starter is located on the front of the car, or the left side of the engine, next to the transmission.
It runs up along the driver side of the engine .
On the top of the transmission, with a harness headed to it, should be about 3 bolts to take off, then valve comes off... shift solenoids are in there