* Specific Model: Chevy trucks came in many different models (e.g., Silverado, C1500, C2500, etc.) and sub-models. The transmission used varied significantly depending on engine size, cab style, and other options. A transmission from a 1997 C1500 might not fit a 1999 C2500.
* Transmission Type: Even if the models are similar, the *type* of transmission must match. You need to know if both trucks have the same automatic (e.g., 4L60E, 4L80E) or manual transmission. The same model number is crucial.
* Bolt Pattern: The transmission's bolt pattern to the engine must be identical.
* Transfer Case (if 4WD): For four-wheel-drive trucks, the transfer case compatibility is also critical.
In short, you cannot assume compatibility. You absolutely *must* verify the transmission part numbers from both trucks to ensure they are identical. A quick VIN lookup of both trucks could help determine the original transmission type. If you're unsure, consulting a mechanic or parts specialist is strongly recommended to avoid wasted time and money.
