for sale a tci boost valve for the gm transmissions! this will increase pressure in the transmission resulting in firmer shifts and longer transmission life.increases clamping will work with applications up to 450 hp!! I paid $70 with shipping for this product. This product is BRAND NEW IN BOX! will sell it for $50 SHIPPED!! first come first serve. quickest way to reach me is my cell 845 238 4024. i check emails and pms once daily. this is the 4l60e .490 boost valve. this is the new upgraded one.