If I were to do it again I wouldn't do more than a 2". I'm doing a 1 or 1.5" on my 97 dually. 3" is enough that its a little hard to get in and out of, but the stance is pretty nice. I bought a kit on ebay, they're still available, which came with a steering shaft extension, works perfect. It is a pain if you have a manual transmission and 4x4, as mentioned, to make the shift boots work. It took me 5 minutes with a crowbar to clearance the drivers side of the body off the head, and I've never heard them contact. If you go with a borgeson or flaming river steering shaft, you could make your own easily enough. Just take all the bolts out, run to the hardware store, and get grade 8s 3" longer, and make a spacer out of metal or stacked hockey pucks (I wouldn't stack 3 though). I'll measure mine in my 97 if I remember, and post the factory lengths so you could have everything ahead of time.