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My first Tundra underwent frame replacement. All went well, and the truck was "good as new" after the dealer handed it back to me. If I recall correctly, the parts/materials list was 4-5 pages long.
Unless you can be satisfied that the used truck you buy comes from one of the desert areas in the southwest, I don't think you can be sure you won't be getting someone else's rust problem. The US Air Force has their aircraft "boneyard" facility near Tucson; one reason for that location is because, besides being in an arid climate, the local soil conditions really don't promote corrosion, as opposed to other geographic regions.
At least with a purchased frame, you're starting with a known quantity.
It's not just the frame itself you'll have to be concerned about. The depth and breadth of the corrosion problem will only become known as you tear your current truck apart. In my case, Toyota bucked up for new lower A-arms on the front suspension as the dealership destroyed the originals trying to get them off the old frame. All fluids were replaced. Other things not covered had to be replaced as well; the towing package wiring harness, for example. Can you be sure that body panels won't be damaged coming off that frame? I know the dealer that did my replacement lifted the cab off the frame in one piece after removing the engine. The bed also came off in one piece.
If it was me, and it's not, the only way I'd take on this work is if I was looking for a real science project or hobbyist rebuild. I can't see a DIY frame replacement as a money saver. I think I'd be in the market for a replacement truck and port over the plow and winter snow handling stuff to the replacement truck.
As Buckaroo suggested, there are YouTube vids of Tundra frame replacements; suggest you watch a few of those to see what the process is all about.
2015 Double Cab SR5 TRD Off Road
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