Farewell Adjustable-T

Wednesday, 29 July 2020


For the past 30 years, the Adjustable-T has been a solid performer in the Powerdown shock absorber range. The product was initially designed for multi-leaf springs that relied on a degree of inter leaf friction of the spring pack & dampening from the shock absorber to provide a compliant ride.

With the evolution of commercial vehicles adopting parabolic springs for increased levels of comfort, a new valving strategy and design was needed to provide improved vehicle control. Powerdown’s engineering team realized that due to the aging design of the Adjustable-T series it lacked the low speed control required by parabolic suspensions.

In general, a parabolic spring is a low friction type of suspension, that does not rely on interleaf friction like a multi-leaf spring to dampen the movement of the vehicle. A parabolic spring can oscillate 2 – 3 times more than a multi-leaf spring as the leaf’s in the pack do not touch each other.

The decision was made to adopt the proven design of the Powerdown LTS range to take the place of the Adjustable-T. The Powerdown LTS series is specifically designed for modern day light to medium trucks and the demands of Australian roads. This modern design has excellent low speed valving to control excessive body movement especially for parabolic spring suspensions.

In the coming months you will see some of our long serving T series to start being replaced by new and existing LTS part numbers. For further information please contact us or visit the LTS page.