I'm in the middle of installing a full TransGo kit. After seeing the puny stock springs, well, I just don't see how the kit won't make firmer shifts. Look at what I'll be adding.
First pic-on the left is stock springs, the right is TransGo. Second pic--TransGo on the left vs. stock accumulator spring for 1-2 and 2-3. Third pic--TransGo vs. stock (yellow springs) 3-4 accumulator springs.