as i know all mv6's had lsd, if you want to check jacup the rear so both rear wheels are off the ground and with car in neutral and hand brake off turn the wheel, if the other wheel turns in the opposite direction it has lsd
That is how a normal (open or non LSD) differential behaves if you have the handbrake on.
There are three types of LSD
- Friction: uses clutch plates to stop the differential operating until a pre set force is applied
- Viscous: uses the drag of a viscous fluid (oil) to control the differential rotation.
- Lock Up: if the differential rotation exceeds a pre set amount the diff locks up solid.
I would assume that the Omega would use a viscous LSD. Turning one rear wheel by hand with the hand brake on you should be able to turn it (slowly) with the drag of the viscous fluid resisting you and the other wheel turning the opposite direction.