AOD Speedo Gear

I am sure this has been posted before, so if someone could point me in the right direction that would be great. I have 4:10's the speedo jumped around 80-100 and any rolling speed, I changed out the speedo drive gear with a 23 tooth, now it jumps around 40-60.... any thoughts on how to correct this? Thank you for your time.
Lou
 
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