Need help with rear "bounce" problem please

WHY NOT · Feb 15, 2015

It's a cc/lb problem. Not many sb guys have an issue.

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BBottoms · Feb 15, 2015

Mine does it. CCSB w '11+ rear springs, 5.5" PMF traction blocks, road force balanced tires and fox shocks. Only solution I've found so far is weight in the bed. Been running around with 300lb in the very back of the bed for the last few months.

smokinstroker · Feb 15, 2015

BBottoms said:
Mine does it. CCSB w '11+ rear springs, 5.5" PMF traction blocks, road force balanced tires and fox shocks. Only solution I've found so far is weight in the bed. Been running around with 300lb in the very back of the bed for the last few months.

Same here.

Mine has done it with 08 springs, carli add a packs, and the full pack.
Also have gone through fox 2.0, 2.0 resi, 2.5 resi, icon shocks etc.

It's a frame flex issue.

Weight in the bed helps a ton

02bigstrokin · Feb 15, 2015

WHY NOT said:
It's a cc/lb problem. Not many sb guys have an issue.

Sent from my I fone 5

Not the case. I've had three ccsb fords that have all done it. And one long bed

Yellow1000 · Feb 15, 2015

Agreed. The short beds are worse from my experience than the long beds I had.

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WHY NOT · Feb 15, 2015

Up until reading your alls posts I haven't actually talked to anyone with a short bed that had the hopping problem

sootie · Feb 15, 2015

mine is a short bed but we also have two long beds and a 550 with the issue

SDS97_7.3 · Feb 15, 2015

I've never had the issue in any Ford I've owned or driven, only bounce I have is from 44-47mph and only on a couple roads in certain sections

05wh250 · Feb 15, 2015

Just an idea, but if bracing the frame worked for a few, could you box part of the frame where the bed and cab meet? Or am I on a completely different thought process?

strokinpower · Feb 15, 2015

that may help but it seems that the bottom of the frame rails aren't connected in enough spots as much as the top of the frame is.

RedRice589 · Feb 15, 2015

You guys need to have a tank full of fuel. In the bed lol or accelerate faster. But yes my ccsb had a wobble at exactly 50mph. But my solution was just accelerate at WOT. And it fixes it. But it's wobbled with michelins, 35/12.50 and it was terrible with 420's and 20x9s. And pretty bad with 20x10s and 35" amp m/TS.

But it would not do it loaded. I don't think lol

Yellow1000 · Feb 15, 2015

Nope your right there. Loaded I never had it in anything.

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WHY NOT · Feb 15, 2015

Does anyone get it at faster speeds? Mine isn't just at one speed its more to do with a section of road vs speed

Yellow1000 · Feb 15, 2015

Faster my short beds bounced a lot.anywhere in the 70s. But I always figured it was due to having junk shocks.

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RedRice589 · Feb 15, 2015

I had icons all the way around on mine but it was not on 35/12.50 on stock 20's. Had crappy stock shocks on the rest. Mine always had a small jiggle but that's just normal for every truck I've had. And the mustang. But nothing even excess. Only at 50 did I have a shake. And I had tires rebalanced a few times as they wore.

bigrpowr · Feb 15, 2015

heres my story -

we have concrete freeways everywhere around here . at 70 mph , bone stock it had some bounce , then lifted 4.5 with 35" nitto trails and icon cdc's it was less, but I would hit points where I needed to accelerate over 80 to get most of it gone. now lowered below stock and back to the factory shocks ( waiting on some king shocks) , its worse than ever. personally I think shock choice IS a factor. i'll let you know once I get mine back from king. had them black anodized so I had to wait. but the bounce I have now at 60-75 sucks balls. front end has always been fine. full tank yields almost no difference that I have seen.

Dzchey21 · Feb 15, 2015

im sure that the shock plays a roll in the bounce but its not the entire issue either.

Sucks we have this problem, makes me want to box the frame in LOL

Cheap6.7 · Feb 15, 2015

My CCLB will get it around 55mph bad at times. I'm sure it's the frame like mentioned before.

bigrpowr · Feb 16, 2015

Dzchey21 said:
im sure that the shock plays a roll in the bounce but its not the entire issue either.

Sucks we have this problem, makes me want to box the frame in LOL

you think its the flex playing a more prominent role ? I sure as hell am not scared to box the section that causes it.

RedRice589 · Feb 16, 2015

bigrpowr said:
heres my story -

we have concrete freeways everywhere around here . at 70 mph , bone stock it had some bounce , then lifted 4.5 with 35" nitto trails and icon cdc's it was less, but I would hit points where I needed to accelerate over 80 to get most of it gone. now lowered below stock and back to the factory shocks ( waiting on some king shocks) , its worse than ever. personally I think shock choice IS a factor. i'll let you know once I get mine back from king. had them black anodized so I had to wait. but the bounce I have now at 60-75 sucks balls. front end has always been fine. full tank yields almost no difference that I have seen.

i had to do the same as i came up onto 80 mph it went away on 420s. But was less prominent with my aux tank full. Has no wobble with 2k lbs of grain in the bed.

New truck does not have it.

Dzchey21 said:
im sure that the shock plays a roll in the bounce but its not the entire issue either.

Sucks we have this problem, makes me want to box the frame in LOL

i think it helps lessen it for sure.