Subframe
The subframe must consist of steel. It is required for attachments whose lumped loads are guided into the chassis, e. g. for dump trucks and tractive units.

The subframe is used to distribute the forces, which are induced punctiformly, uniformly over the entire chassis frame. For this purpose, it should lie above the side rails and be guided to the driver’s cab. In addition, it should be tapered in the front section.

The various air gaps between chassis and subframes need not to be filled. With a floor frame it is possible to fix self-supporting attachments directly at the standard brackets.

Subframes and self-supporting attachments are to be fixed at the chassis using all available brackets.

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Mounting Frame
The mounting frame is exclusively used for directly receiving auxiliary units, etc. Only screws are permitted for attaching the mounting frame at the chassis frame. The mounting frame needs not to cover the entire chassis frame - as is the case with the subframe.

The mounting frames does not meet any strength requirements to protect the chassis frame.

General instructions on the modification of standard vehicles It is not permitted to modify spring characteristics, brake system and steering unit. Exceptions must be approved by Volkswagen AG before the modification is carried out. If noise-emitting parts (e. g. engine, tyres, exhaust system, etc.) are modified, it is required to perform noise measurements according to EC directives. The permitted values must not be exceeded. If the car body is to be modified in the area of the petrol tank, it is required to dismount the tank beforehand.

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Shackle attachment for the first two fastening points, left/right, behind the driver’s cab (if required).