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DIVERSIFIED METAL FABRICATORS, INC.
RW-1013: 4.0 INSTALLATION
4.3.7 Timbren Springs
Some installers use Timbren load springs in place of re-springing. We only recommend them for
Pick-ups and SUV's intended primarily for patrol work and not for trucks intended to operate
near max GVWR continuously.
4.3.8 Exhaust Modifications
Some vehicles require the exhaust to be modified to clear the rail gear. Usually, the installer
cuts the exhaust and has a muffler shop complete the work after the gear is installed. If
multiple identical vehicles are being worked on, you may want to have the exhaust modification
done before the railgear installation. Flexible exhaust pipes can be used temporarily during the
install but is not recommended as a permanent exhaust pipe.
In general, EPA’07 diesel exhausts should only be modified aft of the after-treatment device.
Every attempt should be made to preserve the back pressure so that the required pressure
sensors are not affected. This can be done using an equivalent length method. Many systems
use a diffuser tip to lower the exhaust temperature to safe levels. Diffusers should be retained
if modifications are necessary. Please refer to the chassis vendor’s body builder’s information
on exhaust modifications.
4.3.9 Tire Carrier
Often the vehicle's spare is located in the area to be occupied by the rear railgear. Installers are
often expected to provide a tire carrier in the bed for pickups or on the lift gate for SUV's.
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04_00 RW-1013 Installation.doc