| Here is some info from the web page of people I bought it from: ======================================================================================= The stock automatic takes longer to complete each shift. Points A to B, Figure 1 show only mild acceleration. During this period only a partial power condition exists because the friction elements are slipping. 
This extended slipping time prevents the inertial energy from being efficiently utilized. It is lost in the form of heat on the clutches and bands, instead of being utilized for forward motion. Continually operating a stock automatic at full throttle will cause early friction element failure. To get high performance and improved durability in an automatic, we must improve the way it executes every shift. Trans-Go re-programming achieves durability and performance. So if you are willing to accept a faster shift, which will subtract some comfort, you can restore full performance and durability. This is exactly what a Trans-Go Re-Programming Kit does for you. It makes each shift faster and more efficient. As a result, durability of the transmission is immediately doubled. Re-Programming Goal:Make the shift faster without losing precision. The problem now becomes clear that what we need is re-programming that will precisely control the complicated chain of events that occur during every shift and do it in a far briefer span of time. This is exactly what Trans-Go has accomplished. Trans-Go kits cut slipping time by more than 70% (even more in the Competition version) and at the same time improve the quality of the shifting action itself. Figs 1 and 2 show the results. 
The automatic with a re-programming kit installed now shifts fast enough to take advantage of inertial energy from rotating mass, including the inertial energy from the transmission itself. Notice also the higher speed recorded (C) as the curve leaves the chart. In driving this conversion at full throttle a sudden forward lurch can be felt when it shifts, very similar to a power-shifted 4-speed. ARE QUICK SHIFTS ALL THAT MATTER?
Not by a long way. We have seen what can be gained in durability and performance with quicker shifts. Overlap is also extremely important. Overlap is a condition caused by applying a gear before the previous gear has been released.
Excessive overlap as seen in the Fig. 3 converts engine horsepower into damaging heat and causes clutch wear, band wear, shift delays, short oil life, and increased gasoline usage.
Factory programming includes an excessive amount of overlap.
This is done purely for smoothness. Overlap causes delayed shifts. Overlap is the main cause of shift delay, or hesitation when shifting manually.  
Excessive Overlap is eliminated with Trans-Go Re-Programming. The difference is felt immediately and there are substantial increases in performance, durability and fuel economy. source: [ http://www.txchange.com/transgo.htm ] ======================================================================================= Keep in mind that this is not the only mod that I had performed on my transmission. I also had it rebuild with heavy duty parts and I have a high stall converter (3500-3800 RPM stall) installed: 
I got the converter via Specialty-Z, who also recommended that stall speed. I was reluctant about it but Sebastian assured me that it would be the right choice. And he was right. Plus a Specialty-Z heavy duty flex plate: 
left: Specialty Z flex plate, right: the OEM unit
source: [ http://www.specialtyz.com/transmission.htm ] Check out my profile for a complete list of parts.
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Here is some info form folks who can explain it better - 
