Dobinsons Long travel front struts and rear shocks

Crikeymike

Senior Member
Hey guys,

We have been working on a new set of struts and shocks for the 5th Gen 4Runner, that will also work on the FJ Cruiser too. We wanted a longer travel front strut to get the most out of the front with having a diff drop kit and UCA's installed, and be the correct length for a true 3" lift. 575mm is the maximum we can go, and we were able to get that out of our twin tube design. The compressed length is 435mm. Twin tubes have been great long lasting shocks for several decades, and we wanted to make sure people can afford them too. These were made with the same valving as our 2" struts, which are considered a comfort ride, front and rear. We also raised the seat height on the front (it's a fixed seat, not adjustable) from the standard 213mm to 226mm. That extra 13mm will give about 1" extra lift height, so this means that by running a 2" coil on these struts, you will reach 3" of lift. Although we'd love you to, you don't have to use our coils.

The rear twin tubes are 432mm compressed and 730mm extended. For these, you will need some longer coils (we're making variable rate progressive 3" coils, due here in late January) so that they don't fall out (2" coils won't work), as well as 3" bump stop extensions (we're running Metal Tech), and a longer rear brake line.

Our 4Runner (as shown in my build thread) has been running these longer lengths for 6+ months and the flex has been awesome. Have to point out here that these wouldn't work with a KDSS vehicle, since the rear sway bar would inhibit the flex so much.

We're also working on our own UCA's, but R&D is painstakingly slow, so we're still a few months away from getting those complete.

Once again, here is the summary and comparison.

Dobinsons
GS59-574 - for 3" lift - extended length front struts - 435/575mm
GS59-575 - for 3" lift - extended length rear shocks - 432/730mm

GS59-700 regular 2" lift front struts - 432/541mm
GS59-701 regular 2" lift rear shocks - 362/583mm


I've been searching for a while for some good references to other brands and their length specs, but haven't found solid info. If anyone has it, please share and I will add it in.
 
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Daaaaaaayyuuuum. That pic induces a bit of KDSS regret.

But then she rode great at 85-90 on the drive home from Vegas...
 
Looks great! Very happy to see the products Dobinson is coming out with for the 4runners.

I assume you removed the rear sway bar for that flex?
 
Alright, here are some more details to show the bump stop (with the 3" extension on there).

1st photo is bumper stop just touching and remaining shock left is about 45mm
2nd photo shows shock remaining, 45mm
3rd photo bump stop compressed quite a bit
4th photo shows shock remaining, 40mm
5th and 6th are just 2 other angles to show droop/down travel

With only a 2" bump stop extension, it wouldn't be enough, especially since the bump stop can compress further.

Also - the shocks we have on there now are our rebuildable shocks that we have been using to get all this stuff right. The twin tubes we're offering won't have the exposed shock rod like in the photo.
 

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Seeing the photos showing the rear suspension at full droop prompts me to ask this noob question.

What component/s limit the maximum downward travel for the rear and front suspension?

I lifted my old 2WD pick ups but there, the leaf springs limited the downward travel in the rear and bump stops for the upper arms up front.

Nice looking ride, btw!
 
Seeing the photos showing the rear suspension at full droop prompts me to ask this noob question.

What component/s limit the maximum downward travel for the rear and front suspension?

I lifted my old 2WD pick ups but there, the leaf springs limited the downward travel in the rear and bump stops for the upper arms up front.

Nice looking ride, btw!

Thanks man.

No worries on your noobiness.

In the front, the control arms and strut length limit the front travel. The upper control arm reaches "maximum down travel" at a point too. The strut length is the main limiter again though, so without the right parts up there, CV's would be screaming.

In the rear, it's a combination of control arms (they can bind up if allowed for too much droop), and the shock length (this is the main limiter). Basically, the shocks are the limiting straps. If these shocks were installed without the right combo of parts, the brake line would snap, the coils would fall out, and the shocks would bottom out prematurely causing the mounts to snap or shock to bend out, and all sorts of nasty goodness.
 
Thanks man.

No worries on your noobiness.

In the front, the control arms and strut length limit the front travel. The upper control arm reaches "maximum down travel" at a point too. The strut length is the main limiter again though, so without the right parts up there, CV's would be screaming.

In the rear, it's a combination of control arms (they can bind up if allowed for too much droop), and the shock length (this is the main limiter). Basically, the shocks are the limiting straps. If these shocks were installed without the right combo of parts, the brake line would snap, the coils would fall out, and the shocks would bottom out prematurely causing the mounts to snap or shock to bend out, and all sorts of nasty goodness.

So the dampers are the downward limiters. Then, as long as one is traveling slowly enough (not launching the truck with enough speed to get full on air), the shocks and struts can hold up to the stress of fully extending?
 
So the dampers are the downward limiters. Then, as long as one is traveling slowly enough (not launching the truck with enough speed to get full on air), the shocks and struts can hold up to the stress of fully extending?

Yes, that's correct. A longer travel front strut allows for better down travel, meaning the strut shouldn't top out as much, and not kick itself to death inside. If the strut length is short, and the lift is high, then it's literally trying to pull the strut apart whenever it's at maximum down travel (jumping or wheels off the ground).

In the rear, this amount of flex is more for those needing to keep the tires on the ground for slow crawling. With that much down travel, getting the tires off the ground will be fun, but it can still be done.

Yeah, the shocks definitely need to be very strong to support all that axle weight when the tires do get off the ground. Of course limiting straps could be added to relieve the shocks and struts of that stress. I think Total Chaos uses them on their front IFS long travel kits.
 
So the dampers are the downward limiters. Then, as long as one is traveling slowly enough (not launching the truck with enough speed to get full on air), the shocks and struts can hold up to the stress of fully extending?

In most cases, the shock/strut is the limiting factor for downtravel. And it can take this abuse without issues.
Bumpstops are the limiting factor for uptravel. Shocks/struts won't live very long without them, they aren't designed for those forces.
 
Thanks, for the explanations, guys! Stock Toyota truck suspensions have made some progress from the days of leaf springs and torsion bars.

Just beginning to explore lift options. Looking forward to seeing more about your company's 4Runner offerings in the future, Mike. :thumb:
 

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