"Manually shfting" an auto tranny...

[DemonTSi at aol.com]

Hi folks, I'm pretty ignorant when it comes to trannies, and was wondering if 
someone with a bit of knowledge of modern auto trannies might help me out. Am 
I correct in assuming that most newer auto trans (maybe even old ones too?) 
use a single solenoid to control the flow of oil, which determines the 
shifting of the tranny? If so, is it possible to control the shift points of 
the tranny, assuming that you eliminate the stock programming in the tranny 
ECU? I was just thinking that one could hook up a switch to that shifting 
solenoid and shift "manually"...or maybe it can still be done, but another 
way? 
Any help would be great.....!

Van
- http://members.xoom.com/BADROC