Manuals for several Dallara models:

• F393_user_handbook.pdf
• F394_user_handbook.pdf
• F398_user_handbook.pdf
• MANUAL_F300.pdf (no pictures)
• F300_user_handbook.pdf (scan with pictures, bad text quality)
• F302Manual.pdf
• DallaraF306.pdf

Hewland gearbox manuals: Hewland.com