Is there a way to get RPO codes without the tag on the console? The armreat lid was replaced years ago, and the tag is for another car. The main reason I ask is that I just replaced the gear oil with Mobil 1,and the rear end is non-posi.It also has drum brakes (aluminum). It looks original to the car, but after 21 years who knows.

 

Forgot to mention that its a 85 Iroc, carbd 305, 5 speed and t-tops

 

You could also get the codes from the build sheets. They could be in any number of places, I have heard of them being under any of the four seats or under the carpet, especially in the rear hatch area. The build sheets however, do not have all the codes on one sheet. There are multiple sheets throughout the car, if they were left there at all. I guess Norwood cars had a greater chance of the sheets being in the car than Van Nuys cars.