* 4L60E (4-speed automatic): This was by far the most prevalent transmission in the 1994 Blazer.
* 700R4 (4-speed automatic): Less common than the 4L60E, but possible depending on the engine and trim level.
* Manual transmissions: While less common in full-size Blazers of this era, some models *might* have offered a manual transmission, but this is far less likely than an automatic. If a manual was available, it would likely be a 5-speed.
To know for sure what transmission is in a *specific* 1994 Chevy Blazer, you'd need to check the vehicle's documentation (owner's manual, build sheet, etc.) or look at the transmission itself (though identifying it visually requires some knowledge).