I have DJM beams. My truck rides really good for being as low as it is. I would highly suggest that you get Doetsch Nitro Slammer shocks. In the back I have a 3" notch. I also had to notch for the drive shaft.

what kind of i beams do you have and how does your truck ride considering how low it is i want to lower mine that much and what else do u recommend thanks, nice truck by the way
ROB