If you're planning on taking it off road, consider getting the rear diff in the GX470 rebuilt with a solid pinion spacer. A high mileage 8" rear diff with the OEM crush spacer is likely to fail eventually if ran hard enough.
Model year 2005+ for VVT-i / more power. It runs fine on 87 (but the manual asks for premium).
There are a few people in GXOR with over 400k miles on their 470's.