Power Steering Gear Box
Short answer: You can simply reseal your leaking box (not a big job), but many prefer swapping in a newer, quicker, higher-effort box for better road feel — the output shaft and frame bolts are identical, so a later Z28/Trans Am box bolts in (about 2.2–2.5 turns lock-to-lock).
- Best: the 1978–81 box with the WS-6 package (all 1979 Silver Anniversary cars; a 4-wheel-disc clue) — 2.2 turns lock-to-lock, awesome feel. No external markings, so verify it’s still in its original car before paying up (~$150). Works on 1964–72 A-bodies too, but turning radius is compromised.
- Fittings: a 1976–78 Z28/Trans Am box still uses the imperial hose fittings; later boxes switched to metric O-ring fittings (have new hoses made).
- Input shaft: some later boxes have a smaller-diameter input shaft — a coupling from an old manual gearbox can mate it to the car’s flex coupling.
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Content last modified: June 13, 2026 at 10:06 am
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