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Skinny a Level II 700R4 K-case from Bowtie will handle 450 HP and 450 FPT. That's what is behind my P400. I love the 700R4's lower first gear and higher top gear, and that is why I chose a 700R4 for my drivetrain build. And no electronics to fry, just that elusive TV cable bracket. And no modifications to the drive shafts, as the 700R4 is the same length as the OEM TH400. Just saying.I want to drive one with a 700R4. I know strength wise it's a downgrade but on paper it's great. Has good ratio spreads, low first, tall OD, lockup converter, and it's all hydraulic. For a CUCV that's a great match.
In my mind I always want the beef but in reality when is my CUCV going to be working harder then what a modern built 700R4 could handle? Probably not...
Good luck with the hunt. GM D60 axles have almost tripled by me. A matched set from a 1 ton CUCV is now going for $2500 to $3k.
I'm going to say something unconventional but if I was building a truck and wanted 1 ton gear I'd go Super Duty. Can get a set in either leaf spring or coil flavor and down to 4.30 gears stock.
Front axle even though no hi steer is crossover from the factory as well. You are talking $300-600 maybe for a set in decent shape.