HKS Holinger airshift dog box

An HKS Holinger airshift dog box is a high-performance, sequential dog-engagement transmission designed for racing and high-power applications.
It combines the strength and quick shifting of a dog-ring (or dog-clutch) system with the speed and convenience of air-actuated shifting.

Key features and characteristics:
Dog-ring engagement:
This system uses interlocking “dogs” or teeth on the gears, rather than synchromesh, for a more direct and robust connection. This allows for extremely fast, positive shifts, especially at high RPMs and under load.

Sequential shifting:
The gears are arranged in a sequential pattern (e.g., up for each gear, no need to find neutral), allowing for rapid upshifts and downshifts.

Air-actuated shifting:
An air system is used to control the gear changes, enabling very fast and consistent shifting, even without a clutch (though some applications might still utilize a clutch).

High-strength components:
HKS and Holinger both utilize high-strength materials and robust designs to handle the extreme stresses and demands of racing.

Customization:
These gearboxes are often available with various gear ratios and can be tailored to specific racing applications and vehicle setups.

Applications:
Typically found in high-performance race cars, rally cars, and other vehicles where quick and reliable shifting is crucial.

HKS and Holinger:
HKS:
A Japanese tuning and performance parts manufacturer known for high-quality components.

Holinger Engineering:
An Australian company specializing in high-performance racing gearboxes, including dog-ring and sequential transmissions.

Collaboration:
HKS has partnered with Holinger to produce transmissions like the HKS-GTR, a double-overdrive version of the GRA-6N, and other models.

In summary, an HKS Holinger airshift dog box is a sophisticated transmission designed to withstand the rigors of racing while providing exceptionally fast and reliable shifting through a combination of dog-ring engagement and air-actuated controls.