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The TSB#98-17-2 it covers 1999 F-250HD and F-350 4WD models.
But remember it only lowers the back end of your truck,make sure that they install 2" blocks in place of the 4" ones according to the instructions they don't show the 2" blocks on the diagrahm.
Hope this helps
Now that you've gotten the TSB number from cowboy, be prepared for what to expect from a dealer. There isn't simply a boxed kit to order that fits all SDs. Each truck seeking the modification has to be physically examined at the dealership to see just how it is equipped, and the list of required parts and part numbers is derived from that inspection.
I had mine done, and I'm totally satisfied with the results. It handles fine, and really looks a lot better.
The modification may include many things, including brake hose, shocks, u-bolts and nuts, etc., so that more or less explains why it's got to be a real pain in the a** for the dealers as well as the owners.
Once your truck has been examined and the kit arrives, you're looking at a couple to a few hours of work to install it. Be prepared for the delay, OK?