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Message: [QUOTE="ducatirider944, post: 550898, member: 685"] I had a 2004 F-350 dually. I put a F-350 SRW block on the back axle. Your dually will have 2" rear blocks the F-350 SRW has a 4" block. this will give you 2" of lift in the back. Your truck still uses leaf springs on the front. I then added a extra leaf to the front that went shackle to shackle. This raised the front about 2.5" then I made a 1.5" lift block for the front that was the width of my springs with a hole drilled in the center of the block in order to have the line up pins. This leveled the truck and raised the front by 4". It rode about the same as stock, but I did have a plow mount that was about 250#. I pulled 20K trailers on a regular basis with the truck and never had a problem. I ran 255/85/16's on it which are 33" tall tires vs the 31" stock height. I could have easily ran a 35" or 36" tall tire no problem. What you have to watch is how close your duals get together when picking a tire size. a lot of the taller tires are wider. You need to make sure even when the back is loaded either by something in the back or tongue weight of a trailer that you keep a minimum 1/2"- 3/4" gap in them. if they touch, you will have a tire fire. [/QUOTE]

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