Next is skids.
To date, no one makes a Lexus GX 460-specific full skid kit. It took me some trial-and-error to figure out what works. Based on our feedback and them getting in a 460 to test, RCI now sells a GX 460 kit (you may have to call them) that includes a 5th Gen T4R front, engine and gas tank skid, and 4th Gen V-8 T4R transmission and transfer case skids. You will likely still have to modify the brace over the transfer case as I outline below. RCI's LCA skids for the 5th Gen T4R fit great as well.
First, what generally works without modification: 5th Gen 4Runner gas tank, engine, KDSS front and LCA skids. In the rear, the BudBuilt rear diff skid fits great and works with the KDSS rear end without modification. In front, the GX oil filter is located higher up than the T4R one, and is oriented differently, but you can still access it through the access plate in the RCI skid. The oil drain plug is also still spot-on.
The problem with the transmission and transfer case skids is that the additional size and length of the V8 drivetrain components in the GX cause interference problems with 4Runner kits build around V6 engines. I have not tried the entire skids for Prado 150 kits made for V6 or diesel models, but I can only assume the same would likely be true due to their smaller, less powerful engines.
After much research (but before I discovered the issue above), I first ordered a full KDSS 5th Gen T4R RCI steel skid kit, including gas tank and LCA skids, and the BudBuilt rear differential skid. I went with steel because I prize strength over weight savings.
I paid for the RCI skids to be powdercoated black, while the BudBuilt rear diff skid came bare metal. I used a self-etching primer (careful to mask off the threaded bolt holes) and hammered black Rustoleum to paint the rear diff skid. The rear diff skid went on great and does not interfere with articulation or the KDSS system that I have seen.
I did not know how the RCI skids would work out and whether I would need fabrication, so I brought them to Tandem Automotive here in the DFW area for fitting. It's a great shop if you are looking for work on an offroad Toyota or Lexus platform. They can do installations, fabrication, and they even have their own line of Toyota/Lexus offroad wheels that look fantastic.
Tandem Automotive
As mentioned above, the RCI 5th Gen T4R gas tank skid fits great. Photo below.
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One of the first issues arose with the front skid. The front shroud of the ARB bumber attaches to bolt hole locations on the factory skid that are not found on the RCI skid, and are in fact located further outboard than the RCI skid edges.
I ended up with a simple but inelegant solution - I had them sandwich the ARB center shroud between the frame and skid, then tightened down the skid until it was flush. Below is a photo before tightening. This bent and secured the tabs on the ARB shroud to the point that it wasn't going anywhere. Several hundred serious offroad miles later and there has been no movement.
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And tightened down from a different angle:
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Once we figured out that the 5th Gen V6 T4R transmission and rear diff skid were not going to work, I purchased the 4th Gen V8 ones and we tried again. As it turns out, the cross-brace for the V8 T4R does not fit the GX 460 (makes sense), so we ended up modifying the 5th Gen brace to clear the transfer case. Below is the result. From what I understand, RCI currently instructs GX 460 customers to make this similar modification themselves. I do not know if they plan on creating a new brace for the GX 460 customers.
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By the way, I need to hand it to RCI for their great customer service and for working with me and Tandem Automotive to figure this problem out and get it fixed. The people over there spent a lot of time doing their own research and fitting to find a solution for us and I am very pleased with the results.
Once the clearance issue was taken care of, the V8 T4R skids for the transmission and transfer case went on just fine. They did not line up perfectly with the 5th Gen cross brace, and we needed to drill new holes in the brace for the bolts to go through, but otherwise they worked well.