Sonoran Steel 1.2a and washboard

[arnott1t]

Hey folks, Thought I'd post up a question about how your trucks behave, or misbehave, on gravel road wash board with a Sonoran Steel lift...

I have:
98 4runner SR5 manual
ARB front bumper and 8000lb winch.
Custom sliders
Custom Rear Bumper with swingout. Bumper is heavy and has an integrated 6 gallon air tank.. 4"x6" rect tubing about the width of truck plus plates here and there...
285 BFG KM2's on 80 series rims.
SS 1.2a lift with Bilstien fronts and tokiko rear shock absorbers.

I find when traveling at about 45-50mph on wash board gravel road the rear really jumps around on me. As if the frequency of the bumps can't be dealt with and the rear then skips over to fishtailing behind me. Usually not terrible and is reasonably predictable but other times it jumps on me...

Not sure why....I may need more weight in the back though I do like the stance now....

Any thoughts? How does your suspension do?

I also have many other 4x4's that are better on the washboard...
87 HJ60 on 37's sprung under
91 HZJ 77 on 33's
91 Samurai on 37s
93 dodge 3/4ton on 35's... it is a bit rougher
07 sequoia stock...

The rest handle the wash board a fair bit better. I love the SS lift so much but it just has this one qwerk for me...

 

[hrt4me]

did you install the SS adjustable lateral trac/panhard bar (or weld in place a panhard drop bracket)?

are your sway bars still on the 4Runner?

 

[4Running Daily]

If it isn't what hrt4me said, then I think your rear coils are too soft, causing the rear end to bounce around.

If I were you I would buy some OME 891 coils and swap them out.

 

[yukonrider]

Mine does this. 891's N86's. Relatively stock rear end. No drop bracket, no sway bar.

 

[TCMach]

If I get washboards on turns it will definitely misbehave. Apart from that I can take a washboard road just fine. I'm running an SS lift with Toytec/Eibachs and 9 wraps with plenty of armor and goodies

 

[blue dog]

Replaced my bilstein's with the tokico landcruiser 80 oem shocks on my 1.2 kit, rides a bit stiffer and can carry more weight. I like them better then the Bilsteins. Wash board roads are no problem in my rig.

 

[GSPRunner]

I'm the other way around. With 8 wraps and Tokicos I was all over the place on washboard roads. Switched to Bilstein 5125s and it's much more comfortable. Doesn't matter if there's a bunch of weight in the back or not.

 

[hrt4me]

I have:
'98 4runner SR5 manual
ARB front bumper and 8000lb winch
custom sliders
custom Rear Bumper with swingout. Bumper is heavy and has an integrated 6 gallon air tank... 4"x6" rectangular tubing about the width of truck, plus plates here and there...
285 BFG KM2s on 80 series rims.
SS 1.2a lift with Bilstein fronts and Tokiko rear shock absorbers

BTW, sounds like a nice rig from the description; let's see some pics!

who made your custom rear bumper with swing-out (with tire carrier?)?

 

[JayRolla]

My lc/tokico rear handles washboard great. I have stock bumpers. When I load her down the rear loosens up. You may be over weight with the bumper and tire. You could through a in coil airbag and it will stiffen her up and can level you out when you weigh get down.

 

[Dark Lord]

BTW, sounds like a nice rig from the description; let's see some pics!

who made your custom rear bumper with swing-out (with tire carrier?)?

I second this! Where is your build thread?

 

[BrianSD_42]

Hmmm 40 MPH on gravel or soft sand is plenty fast for attempting "safe driving."

So besides the obvious advice of slowing down, have you called Steve at SS?

He would be the one to suggest swapping a part or the coils out. If you bought used, just tell him , I'm sure he will still help find you the right part. It definitely sounds like you have a good amount of extra weight in the rear.

 

[bxbstgtbhvhao]

Hey folks, Thought I'd post up a question about how your trucks behave

 

[blue dog]

The LC tokico shocks will handle a load better.

 

[arnott1t]

http://www.toyota-4runner.org/3rd-gen-t4rs/125135-arnott1ts-build-98-a.html


Also has adjustable trac bar.

 

[slomatt]

I'm running the SS 1.2 lift with the stock rear bumper and have noticed that the rear end often "jumps" to the side when I hit a large bump. This is probably because the track bar is at a much steeper angle than stock so when the suspension compresses the track bar pushes the axle farther away and when the suspension unloads the track bar pulls the axle back. With a lot of travel in the rear suspension this could cause the body to move a significant amount relative to the rear axle while the suspension cycles.

- Matt

 

[hrt4me]

I'm running the SS 1.2 lift with the stock rear bumper and have noticed that the rear end often "jumps" to the side when I hit a large bump. This is probably because the track bar is at a much steeper angle than stock so when the suspension compresses the track bar pushes the axle farther away and when the suspension unloads the track bar pulls the axle back. With a lot of travel in the rear suspension this could cause the body to move a significant amount relative to the rear axle while the suspension cycles.

- Matt

good explanation, makes sense