Shift Kit

I believe you may have the 1-2 shift valve spring and the torque converter control valve springs swapped. I took apart 3 valve bodies I have and all had nearly identical 1-2 shift valve springs that measure approx. .40 o.d. by .950 long. That is nearly the same length as the 2-3 shift valve spring but a lot smaller diameter just like the pics on the book show. The torque converter control valve spring is nearly the same diameter but a lot longer. Depending on the year it's either 1.25 long or 1.5 long.

On your last post where you showed the 3 springs and said you aren't sure what the red spring is, it's possible it's the original bypass spring that's located in the valve body pocket where you drilled the 3/16 hole through the body, all my valve bodies all have a red spring there. My Trans-go papers say that spring should be replaced with a white one they provide in the kit.

Here's a couple pics of things. First the valve body with parts laid out and text explaining the springs I'm talking about. The next 2 pics are of the 1-2 shift valve spring laid out next to the old style and new style torque converter control springs to show the diff. in size. As you can see the old style converter spring isn't a lot longer but I guarantee it's enough to cause it not to shift. At least till about 26,000 rpm like TB said, LOL...