Super Beast Mode: The Allis Chalmers 8550

Allis Chalmers was covering new ground during the 70s. The ground-breaking 7000 series was selling well, and they’d dipped their toes in the 4WD tractor market with the Steiger-built 440 earlier in the decade. Things were going well enough that in 1976, they unleashed “The Beast” – the 7580. It was AC’s first in-house 4WD …

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