4k gsk and valve springs from tpd
#11
#12
It is worth it. I finally put the springs in mine. I went with 3k for now I didn't want to change the valve spring just yet. I can go back and install the small spring when I get ready for that. It made the truck so much more enjoyable to drive, no more taking it out of O/D when in town. I does not shutter like before, It will smothy idel aroung town in O/D locked up at 45 mph at 1150 rpm. When getting on the freeway you can just step on the pedel and not worry about being in O/D.