yeah, 3-4 spring is a little shorter. i put 3 washers (about 3/16 inch) on the top of the piston. i have a good comparison in the picture on the far right. it's post 11 in this link: http://www.grandprixforums.net/f21/s...lace-8674.html

i used the TransGo springs with the skinnier stock (yellow) spring.