i have a 94 trans am 5.7 lt1 . the only mods i have done is put 3.23 gears under it . the car came stock with 2.73 . here's the problem, the car shuts down at 110 mph. but that an inaccurate reading because of the lower gears . so top speed is about 85 mph. if i put a ecm out of a trans am gt (which has no limiter) will that get rid of the 110 limiter? i know about the hypertech but they cost a lot of $$ . any help would be great

 

You need to buy the equipment and DIY. It is the only way to also correct for the different gear ratio.

 

DIY I know you can change the constant to eliminate the limiter but I thought you had to change the drive/driven gears at the tailhousing to recalibrate the speedo? Or buy some sort of electronic recalibrator?

Also, you have a 94 TA and wouldn't really fall under the 'thirdgen' board.
What year TA GT are you planning to get the ecm from that has no limiter?

 

94 gt ecm

 

www.tunercat.com has the software.
http://www.akmcables.com/ic.htm has the cables.
You'll need to check if you diagnosic connector is OBD 1 OR 2.
94-95 is a transition year and GM use both connectors. So for the total cost of about $150, you can fix the speedo problem. Since you'll have the software you might as well tune the ecm for more power.