New valve for 4L60E from TCI
 

Seen this.... Looks interesting.. :)

www.tciauto.com/new_products.htm

4L60E 0.490" Boost Valve

Operating line pressure is the lifeblood of any automatic transmission by providing the clamping force on the clutches and bands. Oftentimes, increasing line pressure is a requirement when increasing driveline output. TCI®'s new 4L60E boost valve assembly provides you the means of elevating your line pressure while also addressing wear issues that may actually have your transmission running at a lower level of pressure than GM intended!