Nice build mate, sounds like it'll be a hoot.
For lockers, early hilux's (live axle front) ran G series front and rear. Later ones with IFS ran an F series front, G rear.
From memory, the early 3 litre 1KZTE hilux's between 97 and 04ish ran 3.7 diffs, and the later 1KD ones dropped to 3.5ish in the manuals, and 3.7 in auto. Would these be low enough for you?
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