It is basically a 5th gen 4Runner with a Lexus body and the Tundra's lil V8 engine tucked inside of it. It actually is built on the 150 platform which the new 4Runners, Prados, FJCruisers, and (IIRC) Tacomas are built on; the frame is essentially the same as the 120 platform but built with different steel in certain areas from what I learned on the 5th gen thread it was mentioned on.
The 1UR-FE is built much like the 3UR-FE (5.7L V8) equipped in the Tundra, Sequoia, and Land Cruisers. The 4WD system is more similar to the 4th/5th Gen systems though, but is also full-time 4WD like the GX470. It lacks the rolldown rear window that the 4Runners have and Lexus has annouced it is giving the GX the axe come 2016 in favor of some sort of disgusting TX Crossover (aka... blasphemous unibody construction) and thus the legacy of the mid-sized full body on frame SUV comes closer to an end...
Essentially the GX460 is more equivilant to a 5th gen 4Runner with the V8 Package (god I wish that existed...) much like the GX470 was built much like a 4th gen V8; the body paneling and goodies inside might be different but the underpinnings and drivetrain are similar to the 5th gen 4Runner. Which is why I think Toyota was idiotic to offer the anemic 2.7L I4 instead of the 4.6L V8, which they wouldn't have to modify much of anything other than attaching a 5th gen body rather than a GX body...
Either way, they're probably gearing the price lower in an attempt to sell more of them prior to switching to a new platform all together.
The power numbers indicated earlier in the thread are actually incorrect and reflect the GS and LS equipped 1UR-FEs and not the GX vehicles, corrected comparision is as follows:
GX460 1UR-FE: 224 kW (301 hp) and 446 N·m (329 lb·ft) of torque
GX470/4Runner 2UZ-FE: 260 hp (194 kW) and 306 lb·ft (415 N·m)
(Numbers from a combination of Wikipedia and the GX460 product pages)
On a side note- Wikipedia states the 2UZ-FE in the 4Runners is a ULEV engine, so does that mean I get to have those neat Carpool stickers like you see on the Hondas?
