* Engine: Both trucks need to have the same engine (e.g., 5.7L V8, 4.3L V6). The transmission is matched to the engine, so a transmission from a 5.7L won't work in a 4.3L truck (and vice versa).
* Transmission Type: Even with the same engine, there might be minor variations in transmission types (e.g., different gear ratios, electronic vs. purely mechanical controls). While often interchangeable within the same engine and year range, it's not always a perfect match. Slight differences could lead to compatibility issues with the transfer case and/or related components.
To be certain:
1. Identify the exact transmission type: The transmission casting number is crucial. Find this number on the transmission itself (often on the side or top) and compare it for both trucks.
2. Verify engine type: Confirm both trucks have the identical engine.
3. Check transfer case compatibility: The transfer case needs to match the transmission.
4. Consult a parts catalog or a mechanic: A parts catalog specific to Chevy trucks from those years (like a GM parts catalog) is the most reliable source for precise compatibility. A mechanic specializing in these vehicles can also definitively answer the question.
Don't assume compatibility based solely on the year and model. The subtle variations mentioned above can prevent a successful swap.
