Fifteen were produced in 1937. New suspension with two leaf springs on two bogie trucks with four wheels each and three return rollers. The exhaust system and driver's vision port were modified. A new commander's cupola was installed (same as on PzKpfw IV). The rear deck and air louvers were changed.
Chassis Become StuGs
Between 1937 and 1938 five chassis were used for the 0-series of the StuG III.
In October 1940, five (which had been used in experimental Sturmgeschütz) were returned to the armored troops for use as training vehicles.