Sonnax 36948-13K Transmission Valve Kit, Accumulator Regulator (1-2 & 2-3)

Really firms and quickens the shifts

I installed these along with the 3-4 shift springs/valve and the pressure line mods, as well as all upgrades to the pump. She now shifts firm and quickly, unlike stock. I also removed the spring from reverse to enable quicker engagement. This made the truck seem "lighter" and more nimble, in other words, more fun to drive.