GCWR is not really the limiting factor on a TH400, it's the torque being transmitted through the clutch plates. That's a function of the engine torque, rear end gear ratio, and tire diameter as much as the GCWR. You'll be able to move a much higher GCWR with 4.56 gears as opposed to 2.73s - you just won't be able to go as fast.
And which version of the TH400? There are a bunch of versions with different numbers of clutch plates in the clutch packs.
It does not matter if you put 1 ton axles under a 1/2 ton or a supercharged v8 in place of a 200hp v6. The manufacturers rating stays the same. The only way to change the rating is to contact a manufacturer that can give you a new rating. The new rating comes with a legal burden and most manufacturers won't mess with you unless they build it personally.
Start with a vechicle with a healthy tow rating on the door(etc) then your good legal wise to tow that amount.
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