Tangerine Dream is good with LSD.
( Some might say it only sounds good with LSD )
Also, any diff will turn the other wheel backwards. If the propshaft is unable to turn the other wheel will mirror the movements you make. I've seen this many times when changing brake shoes on rear axles.
But you do have an Limited Slip Differential - they all have them. After 30 years of use it might not do much, but you definately have one.
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