To be honest I use Tunercats Obd1 Tuner has a 30 day free trial then after 30 days($69.95) from Tunercat.com also includes a flash program also, and their $EE definition($19.95) to change gear ratios/tire sizes as the application has a built in speedometer calibration tool that makes the correct changes necessary including the shift point tables here is a screenshot
obd1 tuner speedometer calibration.JPG
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