locate calibration box

[moparguy99]

I'm hoping for some help.
Recently I changed my 3.73 gears (which were installed before I owned this car)in my 96 GTS. I put a new factory assembly in w/ 3.07's.
My speedo is way off & I am having a hell of a time finding the calibration box.
Ive looked under the dash, behind kick panels, all around & under the hood, PCM, near tranny, & nothing.
Has any one put one in & have the old directions that tell which wires to splice to install this?
If I know which wires then I'll just trace them to wherever the box is.
Thanks , Matt

 

[TorQ Junkie]

My ACR had gears installed before I bought it as well. The Unitrax box was located under the metal cover where the PCM is housed. It looks like a black cigarette box.