Allison Transmission partnered with HST Otomotiv to deliver the Allison X1100-5A4 cross-drive transmission for integration into the Next Generation T-155 Firtina 155 mm Self-Propelled Howitzer for the Turkish Armed Forces. As part of the initial delivery, 10 transmissions have been successfully provided to Türkiye, with several already installed in the vehicles. Full production of the new tracked defense vehicle is scheduled for July 2024, with a total of 140 Firtina Howitzers expected to be delivered to the Turkish Armed Forces.

The Firtina is one of many growth opportunities expected to drive $100 million of incremental annual revenue in Allison's Defense end market. The Turkish Armed Forces first unveiled the tracked defense vehicle at the International Defense Industry Fair in Istanbul, Türkiye. The next generation Firtina features design and technology improvements including firepower and mobility upgrades.

The vehicle can achieve a maximum speed of up to 65 km/h and is capable of navigating through ditches that are 2.8 meters wide and water bodies with a depth of 1.5 meters. The Allison X1100 Series? cross-drive transmission is specifically designed for heavy tracked combat vehicles from 45 to 63 tonnes.

It offers four forward ranges, two reverse ranges and a cross-drive design that integrates steering and braking into a single compact, rugged unit. The X1100-5A4 transmission will enable the vehicle to operate efficiently in lower engine speeds, which is often required in severe duty-cycles including defense operations.