pinion head thickness

[rockyracoon]

my original 327 pinion had a thickness of 1.874

the new (410) FRPP pinion head has a thickness of 1.895.

so since the new pinion head is .021 thicker, would it be logical to assume that the correct pinion shim would have to be somewhat thinner than the shim on the factory(327) ?,thats what the MHD method would conclude,however in my mind even though the 410 pinion head is thicker than the 327 head,the 410 pinion is definetly smaller in circumference,so I cant see how the MHD would lead towards the correct shim. to me the circumference has to make a difference in some way.
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[347HO]

Did you measure the thickness/differences of the ring gears?

The depth you want is calculated by the etched dimension on the pinion itself.

The diameter of the pinion is determined by the ratio. It does have an impact on height.
Different manufactures sometimes have different pinion depths.

 

[rockyracoon]

yeah but these are ford racing gears,they dont etch a checking distance on their gears.

 

[347HO]

yeah but these are ford racing gears,they dont etch a checking distance on their gears.

That's a bummer.
Just another reason not to use Ford Racing Parts.

I assume you measured your original pinion depth before removing it, knowing Ford Racing doesn't etch their suggested pinion depth?
You could check your method this way?