PW excessive wheel hop on expansion cracks

[crazy jerry]

different springs and shocks wont get rid of expansion joint buck but 500lb in the bed probly will

 

[fireflymedic]

It could also be the distance between front and rear axles making this truck handle differently from your previous trucks. We use to have an old short wheel base pw back in the 70s and I 10 (our interstate hwy) was concrete and that truck would beat you to death. Thank goodness they went to black top on I10.

 

[crazy jerry]

start the video at 2:30 and it should make it clear why these trucks drive the way they do

Unsprung weight & Suspension performance (MTB Rear Ep. 22)

Heavy unsprung weight can affect the suspension performance by reducing the contact between tires and ground over bumpy surfaces. Learn more in this video wi...

youtu.be

 

[Vandy321]

start the video at 2:30 and it should make it clear why these trucks drive the way they do

Unsprung weight & Suspension performance (MTB Rear Ep. 22)

Heavy unsprung weight can affect the suspension performance by reducing the contact between tires and ground over bumpy surfaces. Learn more in this video wi...

youtu.be

Again dude, that's the purpose of designing/installing correct springs/spring rates...the PW was designed to be capable offroad, of course, but it's still a passenger truck and it should ride devent on pavement as well. Not being able to hold a conversation because the freeway ride is so jarring, is not my definition of "a decent ride". It's a crap engineering job...for the 3rd time, glad you're ok with mediocre.

 

[Vandy321]

Jerry?View attachment 473282

 

[GTyankee]

You are likely experiencing what is referred to as ' Kick Out '
What seems to be happening was the rear tires were actually unloading to the point the rear tires would move over and the stock shocks couldn't react fast enough to keep them planted


Death Wobble and the truck kicking sideways are not 2 in the same,
death wobble applies to a loose or worn front end part that starts a chain reaction of un controllable vibration of the front wheels/tires.

To me, it sounds like either you add weight, get stiffer shocks or slow down on bridges, which we all know is not going to happen

When Ram built Power Wagons, they never expected that anyone would be driving over a series of 1" boards evenly placed on a flat surface at any speed over 40 mph

I believe when all is said & done, they will tell you to adapt the equipment or speed

 

[Vandy321]

When Ram built Power Wagons, they never expected that anyone would be driving over a series of 1" boards evenly placed on a flat surface at any speed over 40 mph

1" boards? I think you may have misread the post...i'm referencing expansion joints in concrete, on freeways, Spaced roughly 10-15ft apart (I haven't stopped in the middle of a freeway to measure them)

 

[CanRebel]

You are likely experiencing what is referred to as ' Kick Out '
What seems to be happening was the rear tires were actually unloading to the point the rear tires would move over and the stock shocks couldn't react fast enough to keep them planted


Death Wobble and the truck kicking sideways are not 2 in the same,
death wobble applies to a loose or worn front end part that starts a chain reaction of un controllable vibration of the front wheels/tires.

To me, it sounds like either you add weight, get stiffer shocks or slow down on bridges, which we all know is not going to happen

You are wise Mr. @GTyankee.

I might be wrong here.
Warlock, Rebel, PW are 'off-road' versions. One the differences on these vs other models are coil springs? When I was researching.
It was mentioned front and rear coil springs were softer than other models. Plus all of these have lift.
For PW, it's one of the reasons it's towing/payload is so poor?
Like my Rebel has same or higher than PW's.

Like you mentioned, adding extra weight, would help. But curious why you mention shocks vs coil springs?

 

[GTyankee]

sorry, i have never seen an expansion joints on a freeway or any other county road,
Unless it was on a Bridge or large Culvert
Dirt will get under the joint & on occasion highway workers have to either close a traffic lane or the whole section of road & blow them out with a compressor

I used 1" as an example, any deviation in height will cause a vehicle traveling at speed to lift or drop for a second & that is all that it takes to throw your suspension off kilter

expansion joints

 

[Fatbob Frank]

We have some pretty crappy roads here in N.E. Iowa and one thing my Ford loving Cousin and my Chevy loving cousin both agree on is that my P.W. is the nicest riding 3/4 ton truck they've ever rode in.
They've already volunteered me into driving to Northern Wisconsin for our winter snowmobiling trip...

 

[CanRebel]

@Vandy321 I am wrong, you are talking about something like this ?

Road I drive on, has in some areas like below picture.

Also in other areas, it has small strip of metal between different sections of concrete.

 

[Vandy321]

@Vandy321 I am wrong, you are talking about something like this ?

Road I drive on, has in some areas like below picture.

Also in other areas, it has small strip of metal between different sections of concrete.

View attachment 473285

Similar, indeed. Just running left to right across highway and Spaced about 10-15ft apart. I'll try to snap a photo tomorrow

There's gotta be a fix with spring rates and shock tunes...its just surprising to see so many folks be so accepting of this. I'm not one to exaggerate, the hop is borderline violent, think washboards on forest service road, at 60+

 

[GTyankee]

Perhaps, you are using the incorrect term for what you are trying to describe

An Expansion Joint is used on bridges

Bridge expansion joints are designed to adjust its length accommodating movement or deformation by external loads, shrinkage, or temperature variations, and allow for continuous traffic between bridge structures and interconnecting structures (another bridge or abutment).

What you may be trying to describe is what happens to concrete slabs over a period of time.

Heavy vehicles like loaded semi trucks drive down the highway & whether we realize it or not, they set up a bouncing motion.
That motion when combined with rain going down in between the concrete slabs causes mud, for lack of a better word.
The truck comes along & pounds on the beginning of the concrete slab, pushing it down. meanwhile at the far end of the slab, a bit of gravel slides under the temporarily lifted slab, , each time something heavy drives over that slab over a period of years.
Over time, the leading edge of each slab pushes down & the far end of the slab lifts.
At some point, usually during the night, a construction company will come in & try to grind the concrete slabs back to level again.
We had a highway that got so bad that they actually slowed the speed limit temporarily, until they could let out bids to do the grinding

Nothing but slowing down will make your ride smoother, in that situation

 

[Vandy321]

Perhaps, you are using the incorrect term for what you are trying to describe

An Expansion Joint is used on bridges

Bridge expansion joints are designed to adjust its length accommodating movement or deformation by external loads, shrinkage, or temperature variations, and allow for continuous traffic between bridge structures and interconnecting structures (another bridge or abutment).

What you may be trying to describe is what happens to concrete slabs over a period of time.

Heavy vehicles like loaded semi trucks drive down the highway & whether we realize it or not, they set up a bouncing motion.
That motion when combined with rain going down in between the concrete slabs causes mud, for lack of a better word.
The truck comes along & pounds on the beginning of the concrete slab, pushing it down. meanwhile at the far end of the slab, a bit of gravel slides under the temporarily lifted slab, , each time something heavy drives over that slab over a period of years.
Over time, the leading edge of each slab pushes down & the far end of the slab lifts.
At some point, usually during the night, a construction company will come in & try to grind the concrete slabs back to level again.
We had a highway that got so bad that they actually slowed the speed limit temporarily, until they could let out bids to do the grinding

Nothing but slowing down will make your ride smoother, in that situation

No, I mean expansion joint...some call them expqnsion cracks.

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[CanRebel]

Similar, indeed. Just running left to right across highway and Spaced about 10-15ft apart. I'll try to snap a photo tomorrow

There's gotta be a fix with spring rates and shock tunes...its just surprising to see so many folks be so accepting of this. I'm not one to exaggerate, the hop is borderline violent, think washboards on forest service road, at 60+

Well don't get in accident. But those are what cause my Rebel to bounce, and other vehicles had no issues.

 

[CanRebel]

Perhaps, you are using the incorrect term for what you are trying to describe

An Expansion Joint is used on bridges

Bridge expansion joints are designed to adjust its length accommodating movement or deformation by external loads, shrinkage, or temperature variations, and allow for continuous traffic between bridge structures and interconnecting structures (another bridge or abutment).

What you may be trying to describe is what happens to concrete slabs over a period of time.

Heavy vehicles like loaded semi trucks drive down the highway & whether we realize it or not, they set up a bouncing motion.
That motion when combined with rain going down in between the concrete slabs causes mud, for lack of a better word.
The truck comes along & pounds on the beginning of the concrete slab, pushing it down. meanwhile at the far end of the slab, a bit of gravel slides under the temporarily lifted slab, , each time something heavy drives over that slab over a period of years.
Over time, the leading edge of each slab pushes down & the far end of the slab lifts.
At some point, usually during the night, a construction company will come in & try to grind the concrete slabs back to level again.
We had a highway that got so bad that they actually slowed the speed limit temporarily, until they could let out bids to do the grinding

Nothing but slowing down will make your ride smoother, in that situation

They are called expansion joints or control joints, but nothing to do with Bridge.
Sometimes it's just line with saw. Some newer roads, where I live. They also add a filler one certain roads.

Metal joint I was babbling about, is for bridge/overpass though. But not what Vandy is talking about.

 

[GTyankee]

That is not solid ground under the area shown in the image, that is the beginning of a bridge or large culvert
In 33 years of working on highways, we never shoved rubber tubing between concrete slabs on compacted soil or asphalt.

Usually when a concrete highway is laid, there are no joints. After the concrete dries they Saw Cut the joints

 

[Vandy321]

View attachment 473289

That is not solid ground under the area shown in the image, that is the beginning of a bridge or large culvert
In 33 years of working on highways, we never shoved rubber tubing between concrete slabs on compacted soil or asphalt.

Usually when a concrete highway is laid, there are no joints. After the concrete dries they Saw Cut the joints

Yes, they could very well be cut, or poured that way... It's the same cracks you would put in a garage or driveway slab at specified intervals to prevent actual cracking of ths slab.

Also correct, that pic appears to be of a bridge, that is not the same joint I'm talking about. the article is what I was referencing, not the pic.

 

[CanRebel]

I drive my jeep also 2021. down same road it doesn't bounce as much as Rebel.
But it's also way smaller.

My view Rebel, PW are kind of 'fake' Off-roaders. Even my jeep stock is. But can go places I couldn't bring the Rebel.

There could be something wrong with your PW. I would guess Dealer will say it's 'normal'
You will have adjust driving, trade it, or modify.
Kind of like when I added the new sway bar. Person told me about. Mentioned when they go off-roading, they remove it, and add it back while daily driving.

Adding some sand bags is cheap way to check if that helps.

 

[crazy jerry]

There's gotta be a fix with spring rates and shock tunes...

nothing will be of much help. been there done that. i got thuren spring, fox front and rear. 35psi tires. its not much help against 8-10' spanning highway joints.
permanantly mounting 600lb in the bed will smooth it a bit as now the 800-900lb axles cant kick the truck up and down easily.
getting rid of the truck is your only option. or you could spin your wheels trying stuff that some of us have already tried.