INFORMATION FOR APPROVED PERSONS
SUPPLIED BY QLD TRANSPORT
May
2000
Number 35
TOPIC
2
Body
Lift Kits and Suspension Height Modification
Due
to an ever increasing demand for approvals of suspension modifications, Vehicle
Standards have released the following policy in regards to this matter.
Body
Lift Kits
The
maximum allowable height permitted by Queensland Transport has been set at
50millimeteres ( 2 inches).
Suspension
Height Modifications
The
suspension travel in bump or rebound mode must not be altered by more than
one-third of that measurement as specified by the original manufacturer.
It
should be noted that both modifications can be performed simultaneously to a
vehicle to gain extra vehicle body height but individual specifications must not
be exceeded. Modifiers may have to obtain the original bump stop clearances to
calculate the allowable acceptable increase. The wheels and tyres fitted to a
modified vehicle must continue to compl with the requirements of the Transport
Operations ( Road Use Management – Vehicle Standards and Safety ) Regulation
1999.
An
individual vehicle modification application to be made to Queensland Transport
for body lift kits (blocks between body / cabin and chassis mounts) up to 50 mm
in height. Applications must indicate changes made to implement the modification
(including steering and braking componentry and materials used in the lift
blocks. Body lifts in excess of 50 mm will not be considered.
If acceptable a letter of approval for the installation of a body lift kit will be issued by Queensland Transport
Suspension
height modifications carried out in accordance with good engineering practice
will be considered acceptable where the suspension travel in the bump or rebound
mode is not altered by more than plus or minus one-third of that as specified by
the original manufacturer A vehicle modification application will not be required
as this is considered to be a self approved modification.
Modifications
that involve leaf springs remounted from under axle to over axle are not
regarded as an acceptable form of suspension modification and will not be
approved