I've seen yokes with a groove cut in them by the seal. Check for that condition. If so, you'll have to replace the yoke.
Could be the yoke is a replacement for the alum drive shaft and is a tad smaller in diameter than the original.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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