Tech Support

Diesel Exhaust Fluid (DEF)

Q: What is DEF?

A: Diesel Exhaust Fluid (DEF) is a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water.DEF is the reactant necessary for the functionality of the SCR system. It is a carefully blended aqueous urea solution of 32.5% high purity urea and 67.5% deionized water. Click here to visit for further information.

Freightliner Chassis

Q: Where can I find information on my Freightliner chassis?

A: Click here for a link to official chassis information.


Q: Where can I find Freightliner manuals?

A: Click here to view Freightliner manuals.

Ride Height

Q: What is the ride height of my truck?

A: As measured from the bottom of the spring stop to the top of the u-bolt, the typical ride height of a Freightliner tractor is 2 3/8” – 2 7/8”. Pad is on the left front rear axle.