The Audi 01J Continuously Variable Transmission is also referred to as the J1 Multitronic CVT.
This unit is electronically controlled and is activated hydraulically. It uses a pair of variators that expand and contract in opposite directions to achieve the best possible gear ratio in relation to the engine's rpm.
The variators, a primary drive pulley and a secondary driven pulley, are connected by a special all high strength steel chain. The chain is often referred to as a belt or a steel thrust belt. For the purposes of the CVT, the chain is as flexible as a V-Belt and years of testing have proved to handle high forces and torque levels.
The torque converter found in traditional automatic transmissions has been replaced by an oil cooled drive off clutch system. The absence of the torque converter reduces the weight of the unit. It is said that the gearbox housing is made from a light weight material, possibly magnesium, which will also contribute to weight reduction.
The 01J has a manual mode with six distinct shift patterns. This is referred to as the Tiptronic feature. The controls for shifting with the Tip tronic feature are usually found as buttons on the steering wheel. The electronics controls the pulley system's ratio to achieve the six distinct shifts. When the Tiptronic is not in use this is full automatic transmission.
When rebuilding this unit you should consider:
- Gasket and Seal Kit
- Chain (Belt)
- Clutch Plates (Frictions)
- Steel Plates
- Other hard and soft parts as needed
The 01J Multi Tronic (JF1) is used in the Audi:
- A4 from 2003 to 2008 with the 1.8, 2.0, 3.0, and 3.2 liter engine
- A4 Cabriolet from 2004 to 2007 with the 1.8 and 3.0L engine
- A6 from 2002 to 2004 with the 3.0 liter engine (Sedan and Station Wagon Avant)