I would plan on a complete custom frame and suspension. Those axles weigh in at around 1700lbs a piece plus the weight of the tires. (MUCH bigger tires than those listed on your document, you'd have maybe around 5" of ground clearance under the diffs with those!) In order to handle that much weight you won't be able to get away with just a normal lift kit and shocks if you want to use the truck to even 1/100 the capability of those axles! Figuring coilovers/joints/links/all mounting brackets and a custom frame you'd be getting toward $10k in chassis alone. (not counting building a beefy enough cage to give you sufficient protection if you ever roll it with nearly 2 tons worth of axles on it!) Do you know how to do this work yourself or will you be paying a shop? Have you done a big build before?
Bear in mind, expenses snowball FAST!!!! To give you an idea, my 87 Jimmy build cost me about $30k (your listed budget) with no labor cost involved (labor by friends so: beers and traded parts!), and it was just "normal parts", and some at really good deals (noted prices):
stock GM crate 350 (new)
SM 465 rebuilt (Novak IIRC) with and ORD 32 spline short shaft (to run short figure 8 adapter) with brand new bellhousing, shift fork, etc.
ORD 203/205 doubler with 2" up clock, 32 spline outputs F/R, 32 spline input, triple stick, HAD driveline e-brake
HAD driveshafts
Front Dana 60- ARB, 4.56 gears, 35 spline inners and outers, the big Spicer U-joints, Dynaloc hubs, PSC hydro assist, crossover steering, ORD weld on steering box frame brace brace Solid cover
Rear 14 BFF- Detroit, disc conversion, 4.56 gears (new in crate for only $500!) added Solid cover, Ruff stuff swap kit
Suspension- 3" Tuff Country EZ rides, ORD rear shackle flip, ORD bolt in steering box brace and greasable shackles, upgraded front shackle mounts, extended stainless lines (all came with truck)
(5) H2 take off wheels ($400) rear spacers (1.5" to match front track width)
(5) 37x12.50R17 Cooper STT muds ($1050)
ORD front bumper with Warn 9500ti and Baja Design Solteks
DPI rear bumper and rock sliders
Custom t-case mount crossmembers and 1/4" belly pan (traded extra material for labor!)
Then all the miscellaneous expenses that get crazy (all new fluids, new lights, Carling switches, etc, etc)
By the standards of this site, a pretty average build. NOT a full on craziness build like your parts list dictates and still was $30K!
Please give us some more details as to the reasoning behind your parts choices and what the truck's intended purpose is!
