Changes to Sturmpanzer IV after the first series

• Pistol port added to each rear-side of body
• Gun barrel armor was lengthened
• Roof changed: two piece gunners hatch was eliminated, new ventilator was added
• Only one antenna on the right side
• Angle iron in front of both the commanders and the loaders hatches to ricochet bullets
• Armor plate added to drivers vision port
• Large basic-issue-item container was moved to the left side
• Air filters in some
• Two additional mountings for replacement road wheels
• Armor plating above muffler to help load rounds
• New side skirt brackets
• Zimmerit

• New roof design same as Series Two
• Ausf. E’s were upgraded to new standard parts, mufflers, and brake maintenance access panels
• New side skirt brackets
• Zimmerit

• New periscope drivers vision port

• Redesigned superstructure with bow machine gun, front side angles where removed boxing out the front plate
• Redesigned roof to accommodate new copula, bow machine gun and the change in angle of the superstructure sides
• New commander’s copula, used Stug design
• Mountings for replacement road wheels reverted back to only one per side
• Steel road wheels, this could be from 2 to 4 to all 8 per side or none at all
• Copula mounted machine gun (MG 42)
• Zimmerite, only until September then discontinued

• Based on photo evidence all Sturmpanzer had lower front bolted armor
• Only series 1 had center front bolted armor (this is the vertical font hull armor behind the spare tracks, it was not needed with H & J hulls because they had a single 80mm plate)