Here's something that may explain:
Quote:
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The W-30 package again included what Olds called "Select Fit" engine parts, plus a performance calibrated four-barrel, a hotter cam, and low-restriction exhausts. A Hurst-managed four speed with 3.42:1 gears or a performance-calibrated TurboHydra-matic 400 with a Hurst Dual-Gate shifter and 3.23:1 cogs were drivetrain choices. The Anti-Spin axle was standard and dealer-installed ratios up to 5.00:1 were available. Front disc brakes (with no power assist on four-speed cars), sway bars fore and aft, and G70xl4 white-letter tires were other W-30 components.
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http://musclecars.howstuffworks.com/...4-4-2-w-30.htm