vibration

Hello, I've searched and found nothing on this issue.. I replaced the front pump boost valve (.471 to a .555) trying to get a better grab on my first to second shift, I also replace the 1-2 accumulator with a block off plate from ck, and I get a severe vibration on low gear, I even put the .471...

I've been chasing a vibration problem starting about 65 mph. and above faster you go the worse it gets. Pretty much ruled out tires, drive shaft, pinion angle all have been swapped out or angles changed with no change. Thanks for any advice Mike