A contract automatic transmission is a gearbox that was removed from another car (donor) and installed on your car. The term «contract» means that the transmission is purchased under contract, usually through a used auto parts supplier.
The process of installing a contract automatic transmission:
1. Diagnosis of the problem: A mechanic determines that the transmission in your vehicle is faulty.
2. Finding a Donor: The used parts supplier finds a donor vehicle with a working transmission that is compatible with your vehicle.
3. Removing the gearbox: The gearbox is removed from the donor vehicle.
4. Preparation for installation: The gearbox is checked and, if necessary, repaired or serviced.
5. Installation: The gearbox is installed on your car.
6. Tuning and Programming: The mechanic tunes the transmission to work properly with your vehicle. This may include reprogramming the transmission control module.
Advantages of contract automatic transmissions:
*Less Cost: Contract transmissions typically cost less than new or remanufactured transmissions.
*Faster Repair: Installing a contract transmission can be completed faster than repairing or rebuilding an existing transmission.
* Reliability: Contract transmissions are typically removed from low mileage vehicles and are therefore considered reliable.
*Originality: Contract gearboxes are original equipment, ensuring compatibility and quality.
Disadvantages of contract automatic transmissions:
*Provenance: Sometimes it can be difficult to know the history of the contract transmission and previous use of the donor vehicle.
*Mileage: While low mileage transmissions are preferred, determining the exact mileage of a contract transmission can be difficult.
* Warranty: Contract transmissions usually have a limited or no warranty.
*Installation: Improper installation or setup of a contract transmission can result in performance and reliability issues.