Information:

Ratio Adapter Clearance Schematic - Clark Bros ...

Graphic including dimensions/measurements of the Clark Bros All Makes ratio adapter box.

Clark Brothers Instrument Co. Adapter Types

Different types of CBI speedometer ratio adapters available from Jim's Speedometer World, 8800 series, 40 series, and 41 series.

2004R Speedometer Gear Chart

Infographic Gear Chart for 2004R transmissions, including drive, driven, rear end axle ratio and tire height.