Rear 80 series springs VS 100 series springs

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bhicks

bhicks

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So I'm getting close to the end of collecting parts for my build. I have the BenC front bumper and White Knuckle sliders ready to go on. I have the Japan 4x4 AHC shock spacers also ready to go in. I now have to decide which springs to use on my 03LX470 WITH AHC. I will be keeping the AHC system with the lift. I have the rear 40mm AHC shock spacers with the MAF 30mm coil spring spaces. I have the front 60mm AHC shock spacers. I will be adjusting the rear sensor to get me about 1.5-2" out back. My hope is that with the AHC spacers and spring spacers I should be able to take away any extra load on the AHC. Here is my dilema. I plan to run the BIOR rear bumper (no swingouts) out back. My thought is that the AHC coils wont be able to handle the load. The 33" spare will be mounted underneath. So I have a pair of used 80 series rear springs sitting in my garage and have access to some 100 series rear non AHC springs. With my application, Which springs should I use? There are 3 options: The factory AHC springs, the 80 series springs, and the yota 100 series NON AHC springs. Are the 80 series spring going to produce more or less than the 100 series non AHC springs? Are the 80 series springs stiffer or softer than the 100 series non AHC springs? Sorry for the multiple questions, but this build is going to start in the next week or two and I need to have this figured out before I start ripping stuff off.
 
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Somebody out there has to be able to explain the differences between the 80 series and 100 series rear springs. With the coil spring spacers and AHC shock spacers, I'm not really looking to go much taller. I just need a stiffer spring to hold up the new BIOR rear bumper and not stress my AHC system. Will the 80 or Non AHC 100 springs work best for that?
 
Still nothing? Let me simplify my question. What is the difference (when installed) between the rear 80 series springs and rear 100 series springs on a 100 series?
 
You may be the first to find out.
 
Rear springs are the same for the 80 and 100. Cruiser Outfiters has specs posted on their site. As for what will work with your given set up is anyone guess at best. If your wheeling needs are not first on your list air bags work great for maintaining ride height with weight using AHC I have found.

Interested to know what you expect to get out of spacers on your AHC shocks?
 
It looks like you are looking for spring rate info for the different springs. I did a quick google search and best I came up with is the 100 and 80 springs are the same for some OME springs so it would stand to reason the top and bottom coil diameters are the same. I imagine your 80 springs would fit. Why not put the 80 springs in, load the equivalent bumper weight in the back(maybe on the tailgate to get the location as close as possible) and see how the 80 springs sit and check your neutral pressures to see if it works. You have the springs so all I'd take is acouple hours of your time. Have to figure the non AHC and 80 springs are just a higher spring rate than what you have. Also a part number check should reveal if the 80 and 100 non AHC springs are the same. Good luck
 
Thanks. I found a few threads where guys thought they got more lift by using the 80 series springs but other threads mentioned no gain, so I was very confused. Glad to know they are the same. I will go ahead and toss in the rear 80 springs with the AHC system and use the techstream I picked up to see where we are at.
 
LandCruiserPhil said:
Rear springs are the same for the 80 and 100. Cruiser Outfiters has specs posted on their site. As for what will work with your given set up is anyone guess at best. If your wheeling needs are not first on your list air bags work great for maintaining ride height with weight using AHC I have found.

Interested to know what you expect to get out of spacers on your AHC shocks?
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I noticed that when I put the AHC to the higher setting the reservoir went way down. If I don't use the spacers but install the lift then my reservoir will always be low. The response to that is to then fill the reservoir back to the correct height. With that approach then you will overfill the reservoir when you drop the AHC down to the lowest setting and you can't reach the higher setting because your bottoming out the shocks. I want to retain full function of the AHC with this lift which can't really be done without the spacers. This way the AHC shocks are still right in the middle of their stroke, the reservoir is still right in the middle, and I can go up or down from that point without any fluid issues. I want to make sure I don't bottom out the rear AHC shocks on the trail which is possible if I'm wheelin at the higher setting without any spacers. There were a few guys on there that did this mod a while back that posted the results. They seemed very pleased with the ride and full range of the AHC and it was right in par with what I was wanting out of my rig. My wife is 5'2" and loads our 3 kids (1,3,& 5 years old) into the 100 daily. I want to make sure I can still go back down for loading without flooding the reservoir but bump up to the higher setting if I'm on the trail and trying to crawl over some obstacle.
 
bhicks said:
I noticed that when I put the AHC to the higher setting the reservoir went way down. If I don't use the spacers but install the lift then my reservoir will always be low. The response to that is to then fill the reservoir back to the correct height. With that approach then you will overfill the reservoir when you drop the AHC down to the lowest setting and you can't reach the higher setting because your bottoming out the shocks. I want to retain full function of the AHC with this lift which can't really be done without the spacers. This way the AHC shocks are still right in the middle of their stroke, the reservoir is still right in the middle, and I can go up or down from that point without any fluid issues. I want to make sure I don't bottom out the rear AHC shocks on the trail which is possible if I'm wheelin at the higher setting without any spacers. There were a few guys on there that did this mod a while back that posted the results. They seemed very pleased with the ride and full range of the AHC and it was right in par with what I was wanting out of my rig. My wife is 5'2" and loads our 3 kids (1,3,& 5 years old) into the 100 daily. I want to make sure I can still go back down for loading without flooding the reservoir but bump up to the higher setting if I'm on the trail and trying to crawl over some obstacle.
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There may be some truth to the above in the rear but I dont see the front benefiting from spacers if nothing else in the front they will limit your down travel. The factory position/setting on the front shock is already max'd out when the factory A-arm is at its mechanical limit fully extended. Spacers will net you nothing in extending the front travel.
Let me know what Im missing in regards to the front spacers.
 
LandCruiserPhil said:
There may be some truth to the above in the rear but I dont see the front benefiting from spacers if nothing else in the front they will limit your down travel. The factory position/setting on the front shock is already max'd out when the factory A-arm is at its mechanical limit fully extended. Spacers will net you nothing in extending the front travel.
Let me know what Im missing in regards to the front spacers.
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Your right about the front not benefiting much. There are two benefits for the front spacers and they are minor. The AHC shocks will ride in the factory "N" setting while driving in the "H" height. The fluid levels will also stay the same. Both of those didn't justify the cost. The main reason I picked up the fronts was that I was paying the same stupid high amount of freight from Japan for just the rears as I was paying for both. I figured for an extra $35 I might as well have all 4 corners. That way if I decide I really want the fronts I have them and don't have to pay freight again. The fronts are still on the fence if they will go in. I need to get the TBars torqued to spec and the AHC adjusted up front and then see where I'm at in ride quality, Fluid levels, techstream, and on road stability.
 
What did you end up doing here?

I have a '99 470, w/ AHC, w/ BIOR rear bumper, w/ 5' 02" (barely) wife, and lots of kids in and out of the vehicle, so similar to your criteria.

Did you try the 80 springs?

Does anyone know how 200 series rear springs compare to 100 rear springs?
 
I went with AHC spacers on all 4 corners. Got them from Japan4x4. I also used the 80 series springs. They are much beefier than the stock AHC springs. They had lots of miles on them so they would have sagged on a non AHC 100 but were perfect for an AHC equipped 100 with about 2" of lift out back. The AHC sensor out back had to be adjusted (added a longer bracket). My 100 handled great but unfortunately I sold it over a year ago. It was a sad day to see it go. I often regret that decision to sell it. We ended up getting a Tahoe (way cheaper) which gave me the extra funds to pick up another 80 series. That's my new project truck.
 
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bhicks said:
I went with AHC spacers on all 4 corners. Got them from Japan4x4. I also used the 80 series springs. They are much beefier than the stock AHC springs. They had lots of miles on them so they would have sagged on a non AHC 100 but were perfect for an AHC equipped 100 with about 2" of lift out back. The AHC sensor out back had to be adjusted (added a longer bracket). My 100 road great but unfortunately I sold it over a year ago. It was a sad day to see it go. I often regret that decision to sell it. We ended up getting a Tahoe (way cheaper) which gave me the extra funds to pick up another 80 series. That's my new project truck.
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Thanks! Bummer the 100 is gone. Since I am not lifting mine I will try the inserts, or maybe try to find a set of rear coils from a 450 (not likely)...
 
King coils makes rear springs for AHC equipped trucks. The king springs are 130 pounds per inch vs factory 90 pound springs and less than the normal non ahc 180 pound springs. I have a set on my truck did a small AHC lift helped reduce pressure in my system with the sensor lift while achieving a more controlled ride.

The model for the king springs is Ktrs-79
 
MastiffDad14 said:
King coils makes rear springs for AHC equipped trucks. The king springs are 130 pounds per inch vs factory 90 pound springs and less than the normal non ahc 180 pound springs. I have a set on my truck did a small AHC lift helped reduce pressure in my system with the sensor lift while achieving a more controlled ride.

The model for the king springs is Ktrs-79
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Thanks! It looks like they say this is for normal height - that would be perfect for me.

King Springs Suspension Standard Rear Springs KTRS-79 fits Lexus LX 470 | eBay

It looks like ~ $200 USD, shipping from Oz
 
bhicks said:
I went with AHC spacers on all 4 corners. Got them from Japan4x4. I also used the 80 series springs. They are much beefier than the stock AHC springs. They had lots of miles on them so they would have sagged on a non AHC 100 but were perfect for an AHC equipped 100 with about 2" of lift out back. The AHC sensor out back had to be adjusted (added a longer bracket). My 100 handled great but unfortunately I sold it over a year ago. It was a sad day to see it go. I often regret that decision to sell it. We ended up getting a Tahoe (way cheaper) which gave me the extra funds to pick up another 80 series. That's my new project truck.
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Hey bhicks- I'm looking to do and AHC lift soon- what did you do- swap out rears from 80 Rear Springs adding spacers to that as well? What size spacers? I see you can just mount the sensor higher, which is all I want to do to keep this as simple as possible and not stress the CV axel and boots. I see I can get some 80 springs cheaply - are these preferable over 100's
 
MastiffDad14 said:
King coils makes rear springs for AHC equipped trucks. The king springs are 130 pounds per inch vs factory 90 pound springs and less than the normal non ahc 180 pound springs. I have a set on my truck did a small AHC lift helped reduce pressure in my system with the sensor lift while achieving a more controlled ride.

The model for the king springs is Ktrs-79
Click to expand...
Hey Mastiff- I'm looking into this sensor lift as well. I see the Kings are perfect for this, are spacers needed? I see 80 coils are very cheap, would that be a good fit as well? What else did you do to get the geometry and ride quality where you like?
 
NolaNomad said:
Hey bhicks- I'm looking to do and AHC lift soon- what did you do- swap out rears from 80 Rear Springs adding spacers to that as well? What size spacers? I see you can just mount the sensor higher, which is all I want to do to keep this as simple as possible and not stress the CV axel and boots. I see I can get some 80 springs cheaply - are these preferable over 100's
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That was 9 years ago and I don't remember that build in detail. I don't thick we added any coil spring spacers with the 80 series springs. I think it was just the springs by themselves with the Japan4x4 AHC sensor spacers installed. Hopefully that makes sense.
 
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