This makes a quick shift more desirable when towing, to reduce clutch wear and heat developed in the transmission.
Balancing this, too quick a shift increases peak mechanical loads on the transmission, engine and drive train; an instant shift would cause impact loads and lead to early mechanical failure, as well as an unpleasant driving experience.
For manual transmission equipped cars, it is a component that replaces the stock gear selector (shifter).
An automatic transmission's main focus is smooth shifting between gears.
The term "Shift Kit" is a registered trademark of the company "TransGo" which originated the development of automatic transmission valve body improvement and upgrade components such as springs, valves, and instructional materials to improve the shift characteristics and durability of automatic transmissions.