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Drive Train
A proper mechanical limited slip differential (LSD) is essential for drifting. Open diffs and viscous diffs cannot be controlled during a sustained slide. All other modifications are secondary to the LSD. Popular drift LSDs include OS Giken, KAAZ, & Cusco.
The most popular form of limited slip differential for drifting is the clutch type, in "2-way" form; this is preferred for its consistent and aggressive lockup behavior under all conditions (acceleration and deceleration). Some drift cars will employ a spool "differential", which actually has no differential action at all, the wheels are locked to each other. Budget drifters also use the welded differential, where the side gears are welded to give the same effect. This makes the car very easy to slide at high speed, but difficult to park, and is hard on the driveline. Torsen (available on cars such as S15, FD3S, MX5, JZA8x) and Cone (some Borg Warner) type diffs are adequate, but not generally available aftermarket.
The clutches on drift cars tend to be very tough ceramic brass button or multiple-plate varieties, for durability, as well as to allow rapid "clutch kick" techniques to upset the balance of the car. Gearbox and engine mounts are often replaced with urethane mounts, and dampers added, to control the violent motion of the engine/gearbox under these conditions.
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