To be sure, you'll need to consult a repair manual specific to your 1993 Silverado 350's transmission. A Haynes or Chilton manual would be helpful, showing diagrams and precise locations. You can also find diagrams online through sites that specialize in automotive repair information.
Caution: Working near the transmission can be messy and potentially dangerous. If you're not comfortable working on your vehicle yourself, it's best to take it to a qualified mechanic.