Throwing it out there if the diff is fully mechanical then the wheels should be able to be rotated on the lift or the car be pushed on the ground in neutral.
If you cannot push in neutral then disconnect the drive shaft as now it is isolated to the rear diff and push the car. If it doesn't move I would assume mechanical issue?
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Previous Rides: 13' 135i, 08' 130i, 03' HKS Turbo'd 350z, Modded GC8 WRX, NA MX5
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