i just got through rebuilding a e4od tranny and i put a new bigger sonnax modulator valve in it, i think it was a waste of my money.. or maybe the guy i got it from didnt give me the whole kit, all it was was the plug with the little valve thingy inside, there was no springs involved, just the little valve, should it have came with a stronger spring as well? it seems to me like if the valve is larger with a same spring then it would decrease the pressure or whatever it does?? idk, but i feel nothing different than stock

 

The presision kit should have came with a few springs for each valve. They sleeve into each other and each are different lenghts they assist presision performance.
http://www.sonnax.com/instructions/36948-09K-IN.pdf