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Grinding into 3rd Gear...

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Bruce:
All Bay window Buses and Vanagons have hypoid gears, so do not use that oil.

A hypoid R&P means that the pinion gear is below the centerline of the ring gear.  Manufacturers do this for several reasons.  It allows for more ground clearance (or lowers the drivetrain).  It makes for a stronger R&P.  But the trade-off is that the contact pressures are greater.  The auto makers found that GL-4 rated gear oil did not have a high enough extreme pressure rating to cope with these higher stresses, so the API came out with GL-5 and a higher extreme pressure rating. This is why you MUST use an oil rated GL-5. 

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