Breather valves might be causing the pinion seal leaks but they have nothing to do with the driveshaft.
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Yes - I was unclear in my post, the checking of breather valves is in regard to the leaking seals.Breather valves might be causing the pinion seal leaks but they have nothing to do with the driveshaft.
The new part number supposedly for better rubber on the boots if I recall. But, that wont fix it as we know,
Still, a step in the right direction.