If you don't do anything else for your truck. Spend the $250 for a BTS valve body from BTS. I ordered mine via email, they called for payment and the next week it was on my truck. Well let me be the first to say that this is the best tranny upgrade I have done to a 4r100. I have done the Transgo tugger, and other spring kits. but this one is the best. It works flawlessly with the PHP Tunes and stopped all the hard 1-2 2-3 shifting. made a world of difference. Highly recommended.