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I have a great 1994 Pontiac trans am GT from Canada. I have a connector to the PCM, but I am looking for software to adjust the computer to change the. Rev limetor turned off. I changed the rear differential to 373 gears from 273 automatic to cluch. Do I need to change out the speedometer gear or can I just change it in the program?
 

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The tunercat obd 1 tuner will do what you need done & everything else in the pcm program.

Go to tunercat site & download the trial version of their obd 1 tuner. But you will have to caugh up 20 bucks for the $EE definition file to read your 94 lt1 car.

The trial is for 30 days. If you wish to keep tunercat forever, it's about 100 bucks to do so. You will need a special 12 pin GM type obd 1 port to USB port cable. You can get one for about 60 bucks at the following link.
www.obd2allinone.com/aldl.asp
 
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