* Front or Rear Axle: These often have different bolt patterns.
* Specific Model: The C10, C20, and C30 (and their variations) all had different axle options.
To find the correct bolt pattern, you'll need to either:
* Consult a parts catalog or repair manual specific to your 1964 Chevrolet truck's model and configuration. This is the most reliable method.
* Measure the bolt pattern yourself: If you can access the wheel studs, carefully measure the distance between opposite studs and then divide by two. However, be precise as this method is prone to error.
Without more information about the specific truck, I cannot provide the correct bolt pattern.
