Lincoln Automatics recondition all types of transmission units. Because most automatics are now controlling pressure to clutches and bands by electronic solenoids, the bores in the pump and valve body wear out; clutches and bands then slip due to loss of apply pressure. To achieve a successful recondition, replacement or refurbishment of these pumps and valve bodies is critical. Lincoln automatics have extensive tooling to refurbish these components. Replacement of transmission unit with a second-hand item is not possible on many modern vehicles as coded computers in the transmission will not be compatible with the engine or body control modules. These computers in the transmission are unique to the vehicle and can rarely be re-coded to suit another car.
Types of automatics.
Conventional automatics have evolved from the 2 speed hydraulic unit to the modern 10 speed electronically controlled units. These units use a lock up type torque converter that may start applying in 2nd gear to gain fuel economy. The top gears usually overdrive the transmission.
(CVT) Constantly variable transmission.
These units are equipped in many vehicles particularly in vehicles with smaller engine capacity. They have a metal segmented directional push belt on a set of variable pulleys. These pulleys move with hydraulic pressure controlled by a computer to give almost any ratio desired. There are now 2-stage CVT tranmissions that utilize a planetary gearset reducing load on the belt and a broader ratio range.
(DSG) Dual shaft gearbox (Audi/VW)
(DCT) Dual clutch transmission (Volvo/Ford/Mitsubishi)
These units are a twin shaft manual gearbox. One shaft will contain 1st, 3rd, 5th, 7th gears. The other 2nd, 4th, 6th, Reverse. Hydraulic pressure shifts the gears and hydraulic clutches switch from one shaft to the other which allows for almost instant shifting (approx. 0.3 seconds). When in 1st gear the unit pre-selects 2nd gear on the other shaft which can be achieved because no power is currently transmitted through that shaft. When the 2nd gear shaft clutch activates the other shaft releases and selects 3rd. An internal computer, multiple sensors and solenoids control these units.