Yes, it will add to the holding power of the transgo. It will help greatly over the life of the tranny. I was over with Clint,(when we were talking about the tie rod sleeves) and asked that question. You can control shift firmness with it. It adds more pressure only when it feels the power. The Transgo and the others, add more pressure near the end of the shift or after the power has hit. If you want max life and holding pressure with no problems down the road, it's a pritty good idea to have it if you are running big power. For stockers, it will help hold that 125hp program. However for more power and long life of the tranny, you need to add to it.