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
2013 Lexus GX460 base without rear air suspension
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?
2005 GX470 sport with KDSS
Curb weight: 4,871 lbs
2013 Lexus GX460 base without rear air suspension
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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