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Old 09-08-2020, 03:52 PM #1
NJTrail NJTrail is offline
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KDSS questions surely answered somewhere.. but where?

Guys and gals you have intimidated me with info overload. I recall once seeing a nice simple tutorial with pictures detailing a suspension switch on a 4runner with KDSS. Easy enough that I thought maybe I would try it myself. But I can't seem to find those instructions now, and have been wading through other KDSS oriented threads and coming out a little confused by the various lift options and information. I just want to replace my stock shocks (100K miles on the truck) with bilstein adjustables adding 2 inches height in front and 1 in the rear (or 1 in the front and none in the rear). I would also like to pair them with the correct, length and perhaps slightly stiffer springs if that would be the right thing to do. I have 255-75-17's on the truck and don't expect any issues with the tires. I would like to solicit any thoughts or advice on what I would need or what to tell my shop - they don't ever see KDSS in my area

Question 1 - Is that all the parts that are needed (the shocks and springs) for simply replacing the OEM parts?
Question 2 - What springs are recommended - 75% highway and local but 25% Rocky Mountain Forest Service 4WD roads (washboard, rocky, ruts), occasionally hauling gear and trailer totalling a couple thousand pounds. The truck has worked well enough for my uses off-road with the stock stuff but is alarmingly soft on the highway especially under hard braking (nose-dives!). I'm not sure if that is due mostly to the stock shock, spring, or just overall combination.
Question 3 - Any advice on those critical installation tips on loosening and retightening the KDSS mounts? The shop will be doing the work on a lift but I recall reading that the mounts should be left loose until the vehicle is back on the ground.
Question 4 - Would this upgrade be likely to adversely affect my alignment and as with the above, does KDSS complicate doing the alignment properly (i.e., should it be done with KDSS brackets tight or loose)
Question 5 - If there is a shop in NJ or eastern PA that has KDSS expertise, I'd be happy to entertain the thought of using them.

Thanks!
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Old 09-08-2020, 07:38 PM #2
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The majority of the system is mechanical in nature and I don't think you will have any issues there. The problem areas I see relate to the system integration. KDSS monitors your speed and changes valving when you are under 14 MPH. I do not know if the main computer regulates that behavior and the wiring that accomplishes that communication.

I do know the wires attached to the KDSS valve are susceptible to corrosion and benefit from an annual cleaning.

Best of Luck!
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Old 09-08-2020, 09:10 PM #3
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Quote:
Originally Posted by NJTrail View Post
Guys and gals you have intimidated me with info overload. I recall once seeing a nice simple tutorial with pictures detailing a suspension switch on a 4runner with KDSS. Easy enough that I thought maybe I would try it myself. But I can't seem to find those instructions now, and have been wading through other KDSS oriented threads and coming out a little confused by the various lift options and information. I just want to replace my stock shocks (100K miles on the truck) with bilstein adjustables adding 2 inches height in front and 1 in the rear (or 1 in the front and none in the rear). I would also like to pair them with the correct, length and perhaps slightly stiffer springs if that would be the right thing to do. I have 255-75-17's on the truck and don't expect any issues with the tires. I would like to solicit any thoughts or advice on what I would need or what to tell my shop - they don't ever see KDSS in my area

Question 1 - Is that all the parts that are needed (the shocks and springs) for simply replacing the OEM parts?
Question 2 - What springs are recommended - 75% highway and local but 25% Rocky Mountain Forest Service 4WD roads (washboard, rocky, ruts), occasionally hauling gear and trailer totalling a couple thousand pounds. The truck has worked well enough for my uses off-road with the stock stuff but is alarmingly soft on the highway especially under hard braking (nose-dives!). I'm not sure if that is due mostly to the stock shock, spring, or just overall combination.
Question 3 - Any advice on those critical installation tips on loosening and retightening the KDSS mounts? The shop will be doing the work on a lift but I recall reading that the mounts should be left loose until the vehicle is back on the ground.
Question 4 - Would this upgrade be likely to adversely affect my alignment and as with the above, does KDSS complicate doing the alignment properly (i.e., should it be done with KDSS brackets tight or loose)
Question 5 - If there is a shop in NJ or eastern PA that has KDSS expertise, I'd be happy to entertain the thought of using them.

Thanks!
1. No different than regular 4runner
2. Much of it is personal preference, also if you are using Bilstein 5100s and using one of the spring perches to raise ride height, that preloads the spring
3. Detach/reattach the sway bars with the tires on the ground, use an extra jack, large prybars, and punches to align the swaybar with the LCAs and be careful not to strip the bolts that hold the swaybar to the LCAs.
4. Sway bar has no effect on alignment, it doesn't matter. Increasing the front ride height will have an effect and you should get it aligned after installation.

One thing you will encounter as you mod with KDSS is that KDSS is designed to work with the soft stock springs and shocks. Once you start stiffening up those, when combined with KDSS, ride quality in that 15+ mph range on unpaved roads suffers greatly. I have removed my front KDSS sway bar completely for this reason.
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Old 09-08-2020, 09:24 PM #4
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If you trust the shop, then you could have them do this procedure when installing the shocks. Makes it much easier as the sway bars are "loose"/free

https://cdn.shopify.com/s/files/1/00...ension.pdf?948
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Old 09-08-2020, 11:07 PM #5
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I also have some questions on the KDSS system and what y'all would recommend in my situation. I'm not sure where the right place to post this is but it is pertaining to KDSS specific 4R's.

I have a 2018 TRD OFP I got with 20k miles on it - came with the TRD Bisteins on it - I wanted to get a lift without replacing the whole system for now. I ordered the ToyTec +2 kit specific for the TRD Pro Suspension system. Curious if I will encounter any issues once it's installed being that it's a full on + 2 for the rear on the KDSS.

I also was curious if I could use a slightly larger spacer than is included with the Toytec Kit (order their 1/2 inch spacer instead) would I be OK doing that in the front considering the Bilsteins give me +1 over factory in the front or would that be too much considering I would be adding around 2.5 total on top of what I have currently. I did just add a Lo Pro bumper / winch / light bar and noticed the front came down a tad bit more (I need to get updated pics haha).

I have my lift scheduled for later this month so I still have time to order either the spacer or maybe just a full on new coil over for the front lift. Open to suggestions and any feed back would be greatly appreciated - last thing I wanna do is regret not asking y'all now. I'm new here but have been hounding the forums ever since I picked this up a few months back. Thanks for any help, y'all rock!
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Old 09-09-2020, 08:02 AM #6
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Here ya go...
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File Type: pdf Lift Install KDSS Front Suspension.pdf (1.55 MB, 101 views)
File Type: pdf Lift Install KDSS Rear Suspension.pdf (1.17 MB, 103 views)
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