4T60 speedometer gearing

Cajun47

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I recently swapped out my TH125 for a 4T60 4-speed transmission. My issue is that my speedometer reads really low. The 4T60 is out of a 90 Toronado with a 2.84. The 4T60 had a pulse generator for the Speedo which I have since I have since replaced with a sign-wave generator as original for the 86 GT.

The speedometer drive and driven gears are; 10 & 30. More than likely I will need lower teeth count gears.

Any assistance, advice or direction will be appreciated.
 
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