Yes, an incorrect pinion contact will create howling and whirring noises. If you do remove the pumpkin, brush some Permatex Prussian Blue on the pinion gear to take the guesswork out of the equation and actually see the pinion/ring gear pattern.
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You will see for yourself exactly where the pinion is contacting the ring gear before you start chasing your tail. This basic chart may help.
Gearing Contact Patterns
