I have a 93z with 2:73 gears and want to switch to 3:73s. Since the 93 computer is not programable like the 94 up ones, what should be done so that the ECM and speedo work correctly? Do I need to have a new chip burned or with the car run ok without any changes?

 

anyone? This is with the T56 transmission.

 

I used a Dakota Digital SGI-5 when I put 4.10's in my car. You have to cut the wires going to the speed sensor in the tailshaft of the transmission and run them into the SGI-5. The nice thing is the speedo can then be corrected for different tires or gears very easily since the box stays in the car permanently. I got mine from Summit. Also, the customer service at Dakota Digital is excellent, they helped me get all the switches set in the right position quickly over the phone.

 

Thanks for the help, I bought one of the dakotas from summit and am going to give it a try.