Hey guys. My car is an original 400 auto car, nothings been swapped or modded. My electric kickdown isn't hooked upright now. I hooked it up a while ago and works, cruising along at like 30 - 40 mph hammer the throttle and the tranny down shifts and the car pulls hard. My problem is that it doesn't seem to want to upshift as long as I still have the pedal at full throttle. It feels like it needs to as the rpms are up high and the car isn't pulling as hard. If I back of the throttle a bit it will upshift. But I should be able to just punch it and keep my foot in it and it will kick down and then upshift on its own right? Do I have to adjust the govener on the tranny? I do have a cam in the engine, could I have a vacuum problem? The tranny works fine other wise I would just like to have the kickdown functioning.
Is the vaccum line connected to the modulator? You could have a leak or the modulator could be bad.
If this were happening, then every time you were to stop, and then accelerate, it would hang in fist gear unless you pulled it manually in first and then manually shifted into second etc. I think you may have to change the springs in the governor. What RPMs are you bringing it up to?
I have the same problem and have yet to figure out how to correct it. The only thing I have left to try is to change the line that runs from the carb to the modulator valve. It is supposed to be a steel line; mine is replaced with a rubber tube. It was suggested to me a while back that under vaccuum, the rubber line may be collapsing and causing a vaccuum problem. Ames carries a replacement steel line; is yours rubber or steel?
It shifts fine the way it is now, doesn't hang in a gear nice firm crisp shifts, in drive at full throttle from a stop it will bark the tireswhen it upshifts. I do have a steel line to the modulator. I don't know what rpms i'm bringing it to. It just feels like when it kicks down it stays in the lower gear too long. Like its not accelerating anymore. How do I check the springs in the govener and set it up right?
I think I'm gonna investigate the fuel starving idea. See if I can get my buddy the rochester guru to look at it. May take abit, he's a busy guy. But I will post any updates.
Fuel starvation would be like lifting off the accelerator, thus letting the trans up-shift. My ST-300 doesn't shift until about 5500 rpm's after kick down takes place.
Haven't been abvle to get my carb guy to look at it yet. But I've been searching on here and some other places. Timing was another item that I read could be part of the problem. I haven't been able to check my total timing yet cause my timing light doesn't have that capability. But my initial timing is like 6 or so. From what I've read these motors like about 10 or 12 generally. So I'm gonna play with that next chance I get, and try to get the total timing as well.
