I have an 86 IROC. It came with a 305 TPI motor with auto tranny. This summer I swapped trannys to a t-5 manual. My question is do I need a new prom or can I use the auto version. I have an ADS chip in it now,and I know that GM did not make a 305 TPI manual tranny car in 86,but they did in 87.Can I use an 87 chip in my 86.My understanding is that the ECUs from 86 to 89 were the same part #.

 

I recently did this swap in my 91 305 z28 and had to do some wiring mods to start the car and to get reverse lights.It surrently throws a speed sensor code because it has an electric speedo but the trans is cable.I dont know how yours is but I think I got it taken care of.The only thing with mine is that it runs rough into first I think due to lack of a speed sensor.

 

yes, the 87 prom will work fine in an 86. Other than fan control, they're the same basic setup.

 

After nearly 2 years, I think the person resolved it.

 

Now there's a guy either reading the archives or doing some searching!

 

I'm reading the archives starting from the beginning.

And as my post said... nobody ever answered me on this topic so... I might as well answer it.