Therefore, you cannot determine the correct transmission bolt pattern without knowing the *specific* transmission originally installed in that particular truck. To find the correct transmission, you'd need:
* The truck's VIN: This will help identify the original specifications.
* The transmission's identification tag (if still present): This will directly tell you the transmission model.
* The transmission's case: Experienced mechanics can often identify the transmission from its physical characteristics.
Once you know the *specific* transmission, you can research the correct bolt pattern and find a suitable replacement. You'll likely need to find a parts catalog for that year and model truck or a specialist in vintage heavy-duty truck parts.