As per instructions I received through e-mail......it says to use the tall red 1-2 accumulator spring if over a certian hp level (400hp). I did not get that spring in my kit.....nor did I get a blue shim spring.
It says to use the white 1-2 accumulator spring if less than 400hp and using a 12" converter.
I'll be using a 10" PTC converter and your billet servo, so I assumed I should be using the "red" spring.