Speedometer gear wear

[Mojoe9955]

I have 3 904 transmissions. Looking in the speedo gear hole they all have visible wear, where it looks like the gear is too long. Is this a thing and can I correct it by taking a little off the bottom of the plastic gear? It also appears off center on the "landing pad" on all 3 units as well, any thoughts?
Thanks

 

[Locomotion]

The "off-center" wear could be attributed to the use of a different sized speedometer gears during the lifetime of the trans. You'll notice on the gear housings that they need to be "clocked" according to the # of teeth for proper clearance. i.e.: 26-31, 32-38, 39-45.

I never noticed or paid attention to the wear spots because I always ran my race transmissions with the hole plugged. It may be normal. There is a load pushing on the pinion.

 

[Mojoe9955]

I see the gears have smaller or larger diameters depending on the amount of teeth. It looks like the length and the friction on that surface is what holds them in postion against the output shaft. It makes sense they are plastic, because if they were metal with out a bearing or bushing the wear would be tremendous as opposed to the minor wear we're seeing from the plastic shaft. With this in mind the wear is probably normal and making the shaft shorter may cause a problem rather than alleviate one.
Thanks