I recently bought a 1995 Concorde from a used car lot. It has c. 111000 miles on it. The transmission seems to take a long time to shift from 2nd to 3rd gear. It does not feel like it is slipping, it just feels like it can't find the right gear, like its lost.

I checked the MIL code and came back with a code of 34 Speed Control Solenoid Circuits; or Speed Control Switch Always Low An open or shorted condition detected in the Speed Control vacuum or vent solenoid circuits; or Speed Control input below the minimum acceptable voltage.

I also checked the transmission fluid (checked hot in neutral) and it was a bit low so I added Lucas ATF to it. (Upon further research I see adding new ATF with new detergents to such an old transmission may not be a good thing.) This was a few days ago and today I checked underneath my car to see that is was leaking.

I was thinking about changing or flushing the transmission fluid and changing the gasket and filter. But I don't know if this is the right thing to do without knowing if it has been done before. I've alreadly looked into this quite a bit and the answers vary completely about whether or not to change the fluid.

I want to know if I should change the fluid, flush the fluid or just cry in a corner about a rebuild. And what to do about the MIL code I suspect just change out one of the sensors? If so which one (input or output?)

 

... Anyone?


If nothing else, does anyone have an opinion on changing the transmission fluid? Should I do it? Should I flush it if I do it?