DCT fluid combines both, owing to the unique design of dual-clutch transmissions.DCTs feature an inner and outer input shaft, with the inner shaft housed inside the hollow outer shaft.

On the outer shaft, you have two large disc-shaped radial compressors. These are your workhorses, but they can only build boost once engine speeds climb and exhaust pressure increases.

The AOD features a complicated twin input-shaft system—the outer shaft controls Reverse, First, and Second gear clutches via the torque converter; the inner shaft, driven directly off the engine ...

Where off-the-shelf steel and aluminum shafts cost anywhere from $350 to $500 each, a composite shaft for the same application can run upwards of $1,000. That's the price you pay for solid ...

The outer shaft is 4340 chrome-moly, and the inner is even tougher Vasco tool steel. Being larger in diameter and higher in spline count (26 versus 23) than stock, ...

Think of the outer damper shaft as a nut that’s threaded onto a bolt—like the inner ball screw. Spin the bolt while keeping the nut’s rotation fixed and the nut will move up and down.