Metal-tech 4x4 GX460 Rear Coil Conversion Stage 3 (Stock Height) w/Key Cones

MT-KEY-4004 1
  • Description
  • Additional Information
Metal Tech 4x4 developed and introduced the original complete bolt-on Lexus GX460 rear coil conversion kit to eliminate leaky air bags. The GX460's that came with factory air bags in the rear which are prone to leaking over time and can be very expensive to replace. 
This STAGE 3 KIT uses a STOCK HEIGHT SPRING for people who only want to replace the suspension airbags and keep their vehicle Stock height. For lift springs use the Stage 2 kit with a lift kit sold separately. 

The Metal Tech 4x4 GX460 rear coil conversion kit solves all these issues by removing the air bags and replacing with new stock height coil springs   We achieve this by reproducing what Toyota developed for the Toyota Prado, 4Runner, and FJ Cruiser rear suspension setup.  First there is a bolt on spring locator that mounts to the axle housing with a CNC machined UHMW springtail isolator that slips over for the bottom of the coil spring to rest on. Then we use a brand new US Made custom "Super" stock height coil spring with Key Cones that keeps the spring in place and acts as a secondary dual action spring when the axle comes in hard contact when coming off a ledge.
Super Stock Spring: We found that most GXs when converting to a stock height airbag need a little more spring than the stock Prado 150 rear spring.   So we took the OEM Toyota Prado 150 rear spring, and reproduced it in the US but added 5% additional spring rate but at the stock ride height.   Thus the Super Stock Spring was born and is now in all our Stage 3 kits. 

This rear coil conversion kit is designed to be used for people who want to get rid of their suspension airbags all together and go to a traditional coil spring at factory ride height.  This is kit is 100% bolt on with no additional modifications required. You will need to remove the fuse/relay inside the engine bay, as well as pulling the TEMS fuse in the dash

Kit Includes:
  • 1 Pair of Spring Tail Isolators (description below)
  • 1 Pair of Spring Locators (description below)
  • 1 Pair of Prado 150 Key Cones (description below)
  • 1 Pair of new super stock height coil springs 
GX460 Rear Coil Conversion Complete Kit fits the following vehicle(s):
  • 2010-2018 Lexus GX460

Estimated Install Time: 2.5 hours

Install Guide


Original Coil Conversion Kit 2.0 by Metal-tech 4x4 


Original Coil Conversion Kit 2.0 by Metal-tech 4x4. In late 2007 Metal-tech 4x4 invented the Original bolt-in conversion kit for Lexus GX's. Now, 15yrs later we have updated the design with an easier to install and higher performance machined aluminum body and precision machined custom coil isolator. The key difference is the top of the new aluminum centering puck featuring a recessed countersunk bolt mount, creating a flat striking face for the secondary spring (cone thing inside the top of the coil spring). This new flush face keeps the bolt from damaging the secondary spring on contact. In addition, the hardware included in the kit features a slim nylock (aircraft nut) that is much easier to install than the previous design. The kit is 100% CNC machined in the USA from US made material. The isolator used in the Metal-tech 4x4 kit was updated in 2022, we eliminated the rubbery off the shelf poly isolator.  Soft poly isolators can be too soft for some springs pigtails, leading them to crack the spring.   We moved to a CNC machined isolator cut from UHMW (Ultra High Molecular Weight Polyethylene). This is a high-performance aerospace plastic that is perfect for this application. By custom machining the parts in house at Metal-tech 4x4, we were able to increase the flange size to better support the bottom of the coil spring. Most importantly with the UHMW machined isolator is the springs pigtail is properly supported with no chance of it cracking the spring. 


History of the coil spring conversion kits: 


In 2007 almost no one wheeled a Lexus GX470 let alone modified them. We had a local customer ask if there was a way to lift his GX470, always curious we offered to look at it. We immediately identified it as being what is now common knowledge, but at the time it was not, that the truck was really a Prado120. We realized a suspension kit for an FJ Cruiser or 4th gen 4runner would probably install onto it. However, we had to figure out how to remove the rear airbags, defeat the electronics that would expect the bags to be there, then build a bolt-on solution for the lower airbag mount. We proceeded just because it was an exciting challenge, and the customer was down for us to try on his expensive 2yr old Lexus. It took us close to half a day to figure out how to pull the first airbag! We can remove one now in about 3 min. But again, no one was sharing how to do this back then. Next was to design a bolt-in solution for the conversion kit. The kit needed to be easy to install and center the spring correctly. We made the first bolt spring mount and installed it. It worked so well on the trail that we knew we had something to help other GX owners convert from airbags. We released the first bolt in conversion kits in 2008 and sold a whopping total of 2. That same year we released the first ever made armor for the GX with bolt on sliders. Again, sold 2 sets of sliders for that year!  However, over time with more GXs getting built, our conversion kits took off. Most of the competitors today that sell a bolt in conversion kit used to just buy them from us. Thus, why we call our kits the Original Coil Conversion Kit. Now it's been completely redesigned to the 2.0 version with all the new features of the precision machined parts. 100% Made in the USA. 


Key Cones

Dual Rate high-performance polyurethane upper spring cones for rear mount applications. Toyota calls these “Secondary Springs" (commonly mistakenly called isolators by some). Key Cones were developed by Metal-tech 4x4 and Energy Suspension over a 3yr collaboration. This dual rate secondary spring is featuring Energy Suspensions proprietary polyurethane in two different durometers. The top accordion tip is soft when engaged and the lower body is firmer as your suspension nears the end of travel. Far superior to the single rate basic rubber found in the OEM application. Key Cones unlock hidden performance on your truck.

100% designed, engineered, tested, and made in the USA.   **Patent Pending**

(One truck uses one pair)


NOTE: The included springs in this Stage 3 kit are built to be replacements for "base" model GX460 rear coil springs.  This is the closest we can get to match what the GX470 would have if factory coils were used.   However with some of the GX470s one can feel them "bottoming" even with a non weighted truck.  This is actually the 150% larger frame bump stops hitting the axle first.  The GX470 airbag trucks have oversized frame mounted bump stops, vrs the OEM coilover trucks with a smaller height bump stop.    This about 1" of space can make quite a difference in travel.    This is an easy fix, to swap the rear frame mount bump stops to the coil versions.   You can get them from Toyota or from a local wrecking yard.  Any 2003 or newer 4Runner, FJ Cruiser or base model GX460 will have direct bolt on smaller bump stops that will work great.   Again not every truck needs these but know there is an easy solution if needed. 


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