I had the toytec 3" lift with add-a-leaf on my 05 tundra, never had any problems. They are aluminum spacers and the add-a-leaf was pro-comp, also came with the diff. drop kit. I dont know if they still use pro-comp or not for the leafs. Last week when I traded the truck in, I noticed the one CV boot was torn all the way around. I think that the 3" was a little too much on the older tundras, put a big angle on the CV's. The 2.5" would have been better. The 07 might be different though. But I would go with the add-a-leaf in the rear.