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Ford didn't ever put a 4WD transfer case behind the V8 in the explorer. In the V8, they either put no t-case (2WD) or the AWD t-case. I've heard of people putting a 4WD t-case in after the fact, but Ford didn't do it.
Before the redesign in 02, the V8 could only be had with rear-wheel drive or AWD. Starting in 02, you could get rear-wheel drive or Control-Trac 4WD with the V8. They added the option of AWD to them in 03 (but you can still opt for the Control-Trac.).