... Since you were preferring the 7.3 I'm assuming that's what you got if not disregard most of the following. I used to own a 2001 it was a great truck! First mod I would do is a set of gauges, most importantly an egt gauge.
Thanks Vegas, Yes, it's a 7.3. And based on the comments you, and most others have given, I'm going to wait to regear until I see how everything else go. For now, I'm just going to get the 4" exhaust, and intake (either like you described or an AFE) and a tuner with a mild tune. I wasn't going to get the full guage stack for the A-Pillar, but will at least get the single gauge for the EGT. Once I see how it pulls hills towing the truck and trailer, I'll see how I soon I want to tackle the re-gear. I would love to be able to pull most hills without lugging or down shifting and I'm OK with loosing top end, but we'll see.
As for today's progress, it was a little slow due to the amount if figure'n going on. Good news is that it's all mapped out with the exception of the gas fill neck. The gas fill neck has to be moved back about 24" from it's stock location. That means I'm going to have to get kind of fancy. We're thinking that a 1" piece of exhaust pipe bent with two 90's should do the trick, but it's going to be a bit of a pain to fit in there. Other than that, we've decided to clearance the flat-bed frame to account for the 1.5" hump in the truck frame at the axle. I'll probably bolt some additional 1/4" allum. angle back in for additional strength, but I'm not sure it's even necessary. Doing it this way, the top of the front storage box will be about 1" above the truck roof. Then the camper will sit about 1" above that, making the gap pretty minimal. The top of the truck is about 48.5" above the frame. I also think that will make the flat-bed a lot more secure on the frame.
One of the issues this does bring up is that the frame has all the press rivets on the top surface for the cross members, and setting the bed on there would have been an issue with it resting on the rivets, or having to clearance the flat-bed frame in about 10 places. Additionally, because of the width of the frame rails, and the flat-bed frame, I wasn't happy with how it was going to sit. This part will be easier to see in pictures, but basically, the weight of the entire flatbed/load would be resting on the flange of the flat-bed C-channel. The outside dimension of C-channel is only about 1/8" less than truck frame, and due to the radius of the truck frame, the web of the flat-bed C-channel would have been floating in air. Wasn't happy with that, so we came up with the idea to weld some 1/4" flat steel on the frame to give us the clearance for the rivets, and make the mating surface nice and flat.
I'll finish making all the modifications to the frame tonight, and start on making up the wiring harness from the old bed wiring tomorrow. Here are a couple pictures of the frame, just because I had a hard time finding ANY pictures of the undersides of these. I have to admit, the quality of the build seems very good. All hardware is through bolted. All the welds look good quality. Time will tell how it holds up, but really happy after spending a day looking it over.
I've decided to add an additional stop/turn light on each side and will be using a 17" LED bar. Should give a good bid of extra visibility.
Once I can get the metal bent for the gas tank fill, I should be in business.