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sold with front wheel drive or full-time all wheel drive. Viscous coupling locking center differential, normally 50/50 torque distribution and up to 95% either axle when slipping occurs. Rear limited slip is optional. No low gearing.
2010 Lexus RX350 changes from center differential MF2AV transfer case to a clutch coupled rear differential {see Toyota '06+ RAV4, Venza, '11+ Sienna minivan}