I looked at buying a GX a number of years ago. Although the engine & wheelbase may have been similar if not identical to the LC, the GX was not the LC. The price on the GX (at that time) was between $52-$55k. The Toyota LC was over $80k. Just think about that price discrepency: whatever makes the less luxurious nameplate $30k more expensive must have been substantial. If it wasn't the size of the SUV, then there must have been some ways to differentiate the LC based on all the parts surrounding the engine, and that must have been where the extra $30k Toyota wanted over the GX price. I didn't find the GX particularly appealing overall, and bought a LR instead. Much later, I did get a chance to test out a LC, and that was just awesome. I don't know what the mechanical differences are, but I doubt Toyota was pricing it $30k more than a GX for nothing
.