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I don't think it's sagging, but is there something I should measure to be sure?
Here are some pictures for reference.
The A440f auto tranny will hate 32" or 33" tires...
I have a fresh rebuily 3FE with cam, shaved head and 40 over and I run 31x10.5-15 Duratrac's... excellent size for both gearing and a set of new springs.
If you feel the truck is low on power and a bit slow with the stock tires, it will shurely get worse with a larger tire...