Drive Shaft Yoke Seal Leaks
Short answer: A badly worn yoke usually means the inner tailshaft bushing is worn out — it’s a ~2″ softer (sacrificial) bushing pressed into the tailhousing, and replacing it requires removing the tailshaft. A new yoke alone won’t fix it if the bushing is shot.
That said, some yoke wear is normal at 30+ years — the part sticking out always looks rough; what matters is the surface inside the trans and where the seal rides (a groove worn by the old seal will leak a new one). In normal weighted condition ~3/4 to 1-1/4″ of yoke should stick out of the tailshaft. Replace the seal and yoke (cheap, new or junkyard — common across GM); refresh the gear oil. The finger-tip of sludge on the magnet is normal.
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Content last modified: June 13, 2026 at 10:06 am
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