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GX460 (Prado 150) Rear Coil Springs on GX470 (Prado 120)

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  • GX460 (Prado 150) Rear Coil Springs on GX470 (Prado 120)

    I am looking for some input on a rear suspension conversion. There a plenty of threads on how to do a bag to coil conversion on the rear of the 120 chassis. I have not seen the setup I'm about to describe on any other threads so far. my bags are malfunctioning, probably due to the rear height sensors, but I can upgrade the entire suspension for the cost of 2 sensors, so I'm looking to swap the bags for coils. This seems to be satisfactory to most people who have done the swap and can be undone by a future owner if they choose to do so. The towing stability can be improved with leveling systems or air bladders inside the rear coils, but I rarely tow and my truck is usually pulling the boat rather than the GX so I will skip that for now. So the plan is laid out, what springs do I choose? I've read plenty on the various spring combos, but recently came acros an new one that seems to make sense so far, but I would like to know if anyone can see a problem with my plan before I do the job.

    2005 GX470 sport with KDSS

    Curb weight: 4,871 lbs
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    2013 Lexus GX460 base without rear air suspension
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    Curb Weight: 5,128 lbs

    The 120 was not available with springs, but the newer platform offers a coil rear suspension on the base model, I'm not sure what the spring rate would be, but from what I've read the platforms are similar if not identical as far as drivetrain goes and aside from the weight difference the springs should fit. Right?

    I assume the spring rate would be higher, but probably correct length for the 120 application. The extra spring rate could be good or bad, maybe too stiff for comfortable day to day driving, but anything is better than bumping around on the bump stops like the air suspension seems to do.

    I can't find the spring rate on these springs, and there's no effective spring rate on the current air bag system.

    I am planning to keep the same front springs with Bilstein 5100s front and back and will have spring spacers on hand for leveling the truck if any lean develops. Something tells me this will improve on road handling significantly in combination with the KDSS.

    Thoughts?

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  • #2
    Hey,

    The PP user who has heaps of knowledge in this area is amts, hopefully he'll weigh in here soon, otherwise send him a PM.

    I guess you'll be welding on coil seats? I believe Jason has also done these at his old workshop (second thread).

    http://www.pradopoint.com/showthread...nsion-to-Coils

    http://www.pradopoint.com/showthread...ion-Convertion

    For rear coil choices, take a look here at the PP suspension database;

    http://www.pradopoint.com/showthread...nsion-Database

    Lots of choice for free height and spring rate that will match your front ride height and keep the rake 20-30mm.

    What is your front ride height, bottom of rim to underneath guard? (I'm assuming you're still running the factory 17's?)

    Best

    Mark
    2006 GXL petrol auto. ARB deluxe bar x3 HID IPF's, ARB alloy roofrack, ARB awning, BFG A/T, Safari snorkel, Piranha breathers, Pacemaker extractors, custom Ironman 45710FE 436-569mm with Dobinsons 350, custom Ironman 45682FE 383-618mm with Dobinsons 487, Firestone kevlar 60psi airbags, 30mm extended Roadsafe links, AMTS bashplate and recovery points, ABR Flyer with Powersonic AGM.

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