1985 GP info
 

I am looking at a 85 Gp and was wondering what kind of transmision I would find on a stock car with a 6 cylinder.

Is there a computer-control module for the engine.

Basically I no nothing about the car, but the price is right and I was wondering what to look/look out for.

I have an 86 just like what your 85 is 231 V6 auto. It is the car I'm converting into the NASCAR cup car clone in my signature.

They have an 200-4R overdrive 4 speed and of course as all post 1981 GM cars are Computer Command Controlled. The CCC monitors the O2 sensor and calibrates the primary side of the dual jet carb, It also senses need for air to be injected into the catalalytic convertor via the air pump system to burn the exhaust further and bring the catalyst up to operating temp. It controls the torque converter clutch activation/deactivation via a vehicle speed sensor in the speedometer head. Probably a few other things I'm forgetting that are CCC controlled too.

The car I bought had a rust hole in the oil pan and was run low for oil and spun a rod bearing so you might look at the integrity of the oil pan before buying. The frame rails past the rear wheels was also prone to rust out prematurely on any G body 78-87.

I had a couple of '87 GPs but both were 305V8 cars. I believe the overdrive trans was optional.

[QUOTE=Sirrotica;4122159]
They have an 200-4R overdrive 4 speed and of course as all post 1981 GM cars are Computer Command Controlled. The CCC monitors the O2 sensor and calibrates the primary side of the dual jet carb, It also senses need for air to be injected into the catalalytic convertor via the air pump system to burn the exhaust further and bring the catalyst up to operating temp. It controls the torque converter clutch activation/deactivation via a vehicle speed sensor in the speedometer head. QUOTE]

Any way to get rid of the CCC? If I register the vehicle as a classic/antique there is no requirement for emissions.

Yes but unless there's a problem with it (check engine light coming on) you won't be gaining anything by removing it.

Earlier dual jet carb, and an earlier distributor with vacuum advance will negate it. If you do that and remove the ECM you'll lose the lockup in the torque converter. If it is all working I would leave it alone as you'll get better mileage with it, than taking it off.

You could remove the catalyst and still have the CCC operational and perhaps lose a little back pressure on the exhaust side, but I would leave the O2 sensor connected as it adjusts the fuel air mixture for the CCC.

THM 200C, if its a 3 speed transmission. Weak-Junk, ask me how I know.

Did you end up getting the car?

The 85 GP was actually an 86. Too many other things did not add up when I asked the owner questions.

Overall I did not have a good feeling about it, so the hunt resumes.