Progressive Refinements

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Progressive Refinements is a two volume factory reference manual, covering the “most important modifications and improvements” to type 1, type 2, and type 3 vehicles from 1940 – 1968.

Chassis- and Unit- Numbers

Engine, Clutch, Heating System

Fuel System

Front Axle, Steering

Rear Axle, Transmission

Brakes, Wheels, Tires



Electrical System

General Modifications