The transmission in a 1994 Chevy dump truck varied greatly depending on the specific model of the truck (e.g., C/K series, the engine size, and the options chosen. There wasn't one single transmission used across the board. To determine the transmission in a *specific* 1994 Chevy dump truck, you'd need to check the truck's vehicle identification number (VIN) or look for a tag on the transmission itself.
Common transmissions found in Chevy trucks of that era include various models of manual and automatic transmissions from manufacturers like Allison and others. Without more information about the truck, it's impossible to state definitively which transmission was used.
