* Transmission type: Both Blazers need to have the same type of transmission (automatic or manual). Even within automatic or manual, there are different models (e.g., 700R4, 4L60E). They must be the same.
* Engine type: The transmission must be compatible with the engine in the 1996 Blazer. Even if the transmission *type* matches, the internal components might be different depending on the engine's torque and horsepower.
* Bolt pattern: The transmission's bolt pattern must match the bellhousing on the 1996 Blazer's engine.
* Year-specific differences: Even within the same transmission type, there might be subtle internal differences or external mounting points that changed between 1993 and 1996.
In short: You'd need to identify the *exact* transmission type in both vehicles (look for a tag on the transmission itself) and cross-reference that information with a parts catalog or a mechanic specializing in these vehicles. Simply knowing the year is insufficient to determine compatibility. There's a higher chance of compatibility if both Blazers have the same engine. A direct swap isn't guaranteed, and you might encounter issues that require modifications or additional parts.
