[EricD]

I'm getting a 2" lift kit installed soon but my bigger wish is rear spring air bags to address sag when loaded. It looks like others have installed Firestone Coil-Rite 4155s on FWD versions but as far as I can tell from the Toyota parts diagrams the rear suspension assembly is identical between the AWD and FWD versions. The place that is doing the lift install will do the airbag install but can't guarantee fitment. I'm tempted to have them give it a go and see if it can be made to work.

Thoughts?

 

[bluetroll]

From what I've seen on the site, the rear spring location on the FWD and AWD are different. the AWD has some sort of bump stop on the top of the spring mount, while the FWD does not.

 

[Vanfam12345]

I think you probably saw that within Erics own posts

 

[datsa noydb]

If it’s just a bump stop, how hard would it be to remove it?

The airbags would likely do a better job of limiting movement.
.

 

[EricD]

From what I've seen on the site, the rear spring location on the FWD and AWD are different. the AWD has some sort of bump stop on the top of the spring mount, while the FWD does not.

I thought so as well but looking at a parts diagram: REAR SPRING & SHOCK ABSORBER. 2021 toyota Sienna | Mark Jacobson Toyota, Durham NC it looks like FWD has the bump stop as well.

I'd love for someone with a FWD to take a quick picture of their rear coil spring to help me verify

 

[Alabama XL40]

I vote yes, because this is a problem I will have to solve eventually as well.

 

[DKH]

You can probably head to a suspension shop and have custom springs with a higher rate made for not a crazy price.
I've had custom springs for an s2000 and supra in the past and it wasn't more than a few hundred bucks when I did it.
Granted those are much more popular applications, but a spring isn't anything fancy.

 

[kanin247]

I'm getting a 2" lift kit installed soon but my bigger wish is rear spring air bags to address sag when loaded. It looks like others have installed Firestone Coil-Rite 4155s on FWD versions but as far as I can tell from the Toyota parts diagrams the rear suspension assembly is identical between the AWD and FWD versions. The place that is doing the lift install will do the airbag install but can't guarantee fitment. I'm tempted to have them give it a go and see if it can be made to work.

Thoughts?

I emailed Firestone a while back asking about the Coil-RIte fitment on the AWD version. Here's their response:
"The jounce bumper that is inside the coil spring can’t be removed. That is why our Coil-Rite spring won’t work in your application."

 

[EricD]

Which is interesting because the FWD seems to have a jounce bumper as well from what I can find in parts diagrams and photos.

 

[m3highlander]

Here goes pictures from my FWD XLE…sorry only bags installed shots.

 

[EricD]

Thanks! Do you remember if there was a rubber bumper/stop at the top of the coil spring before the bags were installed?

 

[m3highlander]

Thanks! Do you remember if there was a rubber bumper/stop at the top of the coil spring before the bags were installed?

Unknown...a shop installed it, and I never got under before the install.

 

[Sienna9816]

May be the thread below has pictures you're looking for?? or may be not cause it looks like you've been there already... Anyways, it is worth a second look if you haven't recently.

SumoSprings installation on rear coil springs

SuperSprings CSS-1168 Coil SumoSprings installed on rear coil springs to reduce sag under heavy load I installed this on my 2021 FWD XLE with JOR 3" lift kit. This is compatible with FWD and AWD 2021-2022 Siennas. Another option (not just FWD like I originally posted based on what I had read)...

www.siennachat.com

Btw, one of the pics from @m3highlander shows the remains of the jounce? The rugged edges just above the blue bag appears as such to me?

https://www.siennachat.com/cdn-cgi/image/format=auto,onerror=redirect,width=1920,height=1920,fit=scale-down/https://www.siennachat.com/attachments/ca8e2ddb-51c9-4b2f-84fe-f1708e9eece7-jpeg.54700/

 

[EricD]

Yeah it sure looks like the jounce stop was there. I think I'll pick up this kit and see if I can DIY an install (and take A LOT of pictures)

 

[ROJA]

@EricD You're the hero we need. Would love to know the outcome! The website indicates that these work with "all models" of 2021 Sienna (presumably including AWD): https://www.etrailer.com/Vehicle-Suspension/Toyota/Sienna/2021/F4155.html?VehicleID=20211014470

 

[akasc0rpio]

I called a while back, they confirm is only for FWD.

 

[ROJA]

Weird - this is the same part number (Code F4155) but it says it is for all models (AWD and FWD). You think that's a mistake?

 

[akasc0rpio]

Weird - this is the same part number (Code F4155) but it says it is for all models (AWD and FWD). You think that's a mistake?

View attachment 54813

That’s why i end up calling them. Depends how you search for the fire stone coil, it pops up differently on their site. Good luck, if it works I’ll diy them too.

 

[Reluctant_Minivan_Driver]

I thought so as well but looking at a parts diagram: REAR SPRING & SHOCK ABSORBER. 2021 toyota Sienna | Mark Jacobson Toyota, Durham NC it looks like FWD has the bump stop as well.

I'd love for someone with a FWD to take a quick picture of their rear coil spring to help me verify

2021 XLE FWD. Jounce bumper is present. I believe the FWD and AWD suspension is identical.

 

[EricD]

Looks pretty much identical to my AWD: