Rear End Hop - Ford Powerstroke Diesel Forum
 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 Old 08-17-2013, 04:29 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: Mar 2013
Location: Maryland
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Rear End Hop

I have a 2006 F350 6.0 CC LB with 120k on it that I bought it a few months ago from original owner. It has a very consistent rear end hop between 40-45mph (at lower rpm). I can accelerate through it, and it practically disappears under hard acceleration.

Previous owner had a Diablo tuner, but that came off immediately after I purchased the truck, and I have been running OEM since (want to go with SCT customer tune but waiting to solve the Hopping issue before spending more $). I replaced all fluids and filters, including differentials, (Amsoil and K&N) and a new FICM, and 2.5" level spacers. Motor is strong and smooth.

First thought was tire balance, so that has been done along with rotation in case one tire had bad belts, et. Problem not solved....thought perhaps oem shocks the problem, so I replaced all four with appropriate size to accommodate front end level kit. Problem not solved.

Not sure where to look next, anyone else experience this in the past? Not looking to spend a fortune chasing ghosts...any help would be greatly appreciated.

Thanks.
Crfmxer is offline  
post #2 of 17 Old 12-13-2013, 12:23 PM
Compression Ignition Addict
 
dieselshield's Avatar
 
Join Date: Aug 2012
Location: Nashville
Posts: 225
Thanks: 0
Thanked 5 Times in 5 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
You ever figure this out? My truck has the same hop at 35-40, I spent money on a new driveshaft, new tires, new shocks, and some other stuff. Still no solution.

2005 F-250 CC FX4
[SIZE="6"][COLOR="Blue"]
APR head studs & oem head gaskets
Warren diesel injectors - stock
OEM Oil Cooler
Dummy plugs & stand pipes
IPR egr gen 2 delete
Updated STC Fitting
Updated turbo train tube
'08 trans pan & filter
Dieselsite coolant Filter
EGT & Fuel PSI guage
Rotella Ultra ELC
Blue Spring
Updated HFCM drain
Riff Raff boots
4" Diamond Eye turbo back
Billet fuel filter cap
Ed's FICM-eco tune
High Idle Mod
Manual fan control
Torque Monitor

dieselshield is offline  
post #3 of 17 Old 12-13-2013, 01:58 PM
I Like Shiny Things :)







 
nighthawk285's Avatar
 
Join Date: Jan 2013
Location: La Grande, Oregon
Posts: 12,009
Thanks: 101
Thanked 800 Times in 718 Posts
Mentioned: 60 Post(s)
Quoted: 1228 Post(s)
Feedback Score: 3 reviews
yep, mine does it too from about 40-45......found out it's pretty common for us CCLB guys, something with how much rotating mass there is, although to be honest with you guys, it feels more like it's coming from the front to me.

2005 King Ranch F-350: Studded and O-Ringed, BPD Oil Bypass, 205/30s, Stage 2 KC Turbo, ODAWG Ported Manifold, 4" TB Exhaust, Stage 2 AFE Intake, Billet Torque Converter, BPD 58V FICM, BPD Water Pump

2.5" Leveling Kit, 35s, Fusion Bumpers, ProTech Headache Rack, OnBoard Air, and a few other goodies
nighthawk285 is offline  
post #4 of 17 Old 12-16-2013, 07:59 PM
Fill it up again Dummy
 
mhatlen's Avatar
 
Join Date: Sep 2012
Location: Central Valley, Sierra Mountains, California
Posts: 2,356
Thanks: 38
Thanked 112 Times in 101 Posts
Mentioned: 7 Post(s)
Quoted: 213 Post(s)
Feedback Score: 0 reviews
It's very possible your feeling frame bobble. At least thTs what I call it lol. I would get it going over a speed hump or at times regular speed bumps. Frame flex kinda like a gallop, I added some additional crossmembers and it took care of it on my truck. Posted a pic on suspension discussion on a post called looking for ideas or suggestions or something like that by AutoTech.


2006 F250 LARIAT CCSB 4X4
ARP Studs, O-Ringed Heads
X4 PHP 65 HP Custom Tow Tune
Atlas40 Ficm Tune
CAT EC-1 Coolant, IPR Coolant filter
Fass-125 to a Adjustable Pressure Reg.
Turbo-back SS 4" pipe, Corsa Muffler -7" Tip
6.4 starter, DC Power 270 amp alt
Die Hard Platinum AGM all 2/0 Cables
7" lift w: Icon Progressive Coil Springs
2008 up Carli/Deaver rear springs
All riding on some Fatty-Daddy 38/15.50/18 Toyo's
mhatlen is offline  
post #5 of 17 Old 12-18-2013, 03:44 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Mar 2013
Location: Maryland
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Rear End Hop

Still not fixed, thanks for feedback....
Crfmxer is offline  
post #6 of 17 Old 12-23-2013, 06:58 PM
Fill it up again Dummy
 
mhatlen's Avatar
 
Join Date: Sep 2012
Location: Central Valley, Sierra Mountains, California
Posts: 2,356
Thanks: 38
Thanked 112 Times in 101 Posts
Mentioned: 7 Post(s)
Quoted: 213 Post(s)
Feedback Score: 0 reviews
Going to list possibilities:

U-Bolts loosened up
Carrier Bearing: loose,rubber isolator degraded and worn loose, bearing worn causing vibration.
U/J's worn or misaligned.
If it's lifted has it been shimmed at the carrier bearing.

Your problem is there in one of those places


2006 F250 LARIAT CCSB 4X4
ARP Studs, O-Ringed Heads
X4 PHP 65 HP Custom Tow Tune
Atlas40 Ficm Tune
CAT EC-1 Coolant, IPR Coolant filter
Fass-125 to a Adjustable Pressure Reg.
Turbo-back SS 4" pipe, Corsa Muffler -7" Tip
6.4 starter, DC Power 270 amp alt
Die Hard Platinum AGM all 2/0 Cables
7" lift w: Icon Progressive Coil Springs
2008 up Carli/Deaver rear springs
All riding on some Fatty-Daddy 38/15.50/18 Toyo's
mhatlen is offline  
post #7 of 17 Old 12-24-2013, 05:04 AM
Compression Ignition Addict
 
F250SixOH's Avatar
 
Join Date: Nov 2011
Location: Concord, NC
Posts: 1,035
Thanks: 0
Thanked 15 Times in 13 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I've replaced so many things and haven't figured this out either. It will about shake you to death at 43mph! There is a huge thread on ford-trucks that I read when I was searching this problem. I don't think anyone has a firm solution to this. A couple people had custom drive shafts made IIRC. Here is the link.

Rear end bounces @ 40-45 MPH - Ford Truck Enthusiasts Forums

Mine is an ECLB by the way.
F250SixOH is offline  
post #8 of 17 Old 12-24-2013, 07:49 AM
Fill it up again Dummy
 
mhatlen's Avatar
 
Join Date: Sep 2012
Location: Central Valley, Sierra Mountains, California
Posts: 2,356
Thanks: 38
Thanked 112 Times in 101 Posts
Mentioned: 7 Post(s)
Quoted: 213 Post(s)
Feedback Score: 0 reviews
I think I know what your talking about to a degree. My truck is the same SCLB which is the typical frame same as the CCSB. The vibration I was getting I figured was frame flexing or oscillation that I called frame bobble.

My remedy for it was to add crossmembers to my chassis.
I installed 2 additional cross-members directly above and below the transfer case output shaft. (3/8X6" flat w/1" solid square stock down length for upper)(3"channel lower)


Added another between the radius arm hangers. (3"channel iron)
Added a stiffener to the transmission crossmember which is also 3" channel because it fits inside track of the oem. Drilled three 3/4" holes down length to bolt them together. Also the two transmission mount bolts are used. I used 1" solid steel square stock from the transmission stiffener to radius arm crossmember and diagonally back 18" left and right frame rails.
This 100% stopped my frame bobble or bouncing. Truck drives and behaves much differently now. No longer leans into turns like it did and the biggest change is no more flexing like before. It feels like a shorter chassis to me for whatever reason but no more flexing bobble hop or whatever you want to call it.

One last thing you may try that's easy is: get a oil can and hit the leaf springs between leafs down the length. Make sure you hit all the Teflon slide points on the ends of the leafs too. This is no miracle cure but does help the leafs move back and forth on each other and is actually noticeable.
Good luck on it


2006 F250 LARIAT CCSB 4X4
ARP Studs, O-Ringed Heads
X4 PHP 65 HP Custom Tow Tune
Atlas40 Ficm Tune
CAT EC-1 Coolant, IPR Coolant filter
Fass-125 to a Adjustable Pressure Reg.
Turbo-back SS 4" pipe, Corsa Muffler -7" Tip
6.4 starter, DC Power 270 amp alt
Die Hard Platinum AGM all 2/0 Cables
7" lift w: Icon Progressive Coil Springs
2008 up Carli/Deaver rear springs
All riding on some Fatty-Daddy 38/15.50/18 Toyo's
mhatlen is offline  
post #9 of 17 Old 12-24-2013, 07:57 AM
Fill it up again Dummy
 
mhatlen's Avatar
 
Join Date: Sep 2012
Location: Central Valley, Sierra Mountains, California
Posts: 2,356
Thanks: 38
Thanked 112 Times in 101 Posts
Mentioned: 7 Post(s)
Quoted: 213 Post(s)
Feedback Score: 0 reviews
A picture of front crossmember.
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	282
Size:	91.1 KB
ID:	217554  


2006 F250 LARIAT CCSB 4X4
ARP Studs, O-Ringed Heads
X4 PHP 65 HP Custom Tow Tune
Atlas40 Ficm Tune
CAT EC-1 Coolant, IPR Coolant filter
Fass-125 to a Adjustable Pressure Reg.
Turbo-back SS 4" pipe, Corsa Muffler -7" Tip
6.4 starter, DC Power 270 amp alt
Die Hard Platinum AGM all 2/0 Cables
7" lift w: Icon Progressive Coil Springs
2008 up Carli/Deaver rear springs
All riding on some Fatty-Daddy 38/15.50/18 Toyo's
mhatlen is offline  
post #10 of 17 Old 12-24-2013, 09:43 AM
I Like Shiny Things :)







 
nighthawk285's Avatar
 
Join Date: Jan 2013
Location: La Grande, Oregon
Posts: 12,009
Thanks: 101
Thanked 800 Times in 718 Posts
Mentioned: 60 Post(s)
Quoted: 1228 Post(s)
Feedback Score: 3 reviews
Quote:
Originally Posted by mhatlen View Post
I think I know what your talking about to a degree. My truck is the same SCLB which is the typical frame same as the CCSB. The vibration I was getting I figured was frame flexing or oscillation that I called frame bobble.

My remedy for it was to add crossmembers to my chassis.
I installed 2 additional cross-members directly above and below the transfer case output shaft. (3/8X6" flat w/1" solid square stock down length for upper)(3"channel lower)


Added another between the radius arm hangers. (3"channel iron)
Added a stiffener to the transmission crossmember which is also 3" channel because it fits inside track of the oem. Drilled three 3/4" holes down length to bolt them together. Also the two transmission mount bolts are used. I used 1" solid steel square stock from the transmission stiffener to radius arm crossmember and diagonally back 18" left and right frame rails.
This 100% stopped my frame bobble or bouncing. Truck drives and behaves much differently now. No longer leans into turns like it did and the biggest change is no more flexing like before. It feels like a shorter chassis to me for whatever reason but no more flexing bobble hop or whatever you want to call it.

One last thing you may try that's easy is: get a oil can and hit the leaf springs between leafs down the length. Make sure you hit all the Teflon slide points on the ends of the leafs too. This is no miracle cure but does help the leafs move back and forth on each other and is actually noticeable.
Good luck on it
That's kinda how my theory is on this too. Funny enough, I had it on my '87 F150 SCSB too and reading through the thread that sixOH posted, it spreads across many years (one guy had a '78 that did it). I've been working on a fix that is somewhat like yours and I'm glad to hear it worked. I just got all my materials and will be building a new x-member to bolt in.

My theory on this is with just how much material we have working/bouncing down the road and not necessarily the lack of strength our trucks have to hold it, but it doesn't support itself very well. Crawl under your truck and look, especially with us CCLB guys, there's a lot of blank real estate in between the trans crossmember and the back of the frame. There's a couple stamped crossmembers along the top of the frame, but they're more for body mounts, and IMO aren't doing a good enough job tying the frame together. So my running theory is that it's not a drivetrain vibration we're feeling, but a frame vibration. Both rails of the frame are moving at different rates (being pushed around by the springs/axle) because there's not enough crossmembers holding them together.

Now to answer the question "why doesn't it happen on every truck?" well maybe the trucks that it has happened to have done something in their "lives" , like going onto a ramp at a funny angle and getting a little frame twist, to work some things loose and that amplifies it bad enough for us to feel it. Also reading a lot into this I've found that some trucks haven't done it until 50k-100k into their runs. That makes sense, since now bushings are starting to wear and aren't holding the vibrations at bay as well as they once did.

We're not alone, google the "superduty hop" and you'll find tons of threads, articles, etc. I should have my new crossmember done in the next month or so, I'll keep you guys posted on the results

2005 King Ranch F-350: Studded and O-Ringed, BPD Oil Bypass, 205/30s, Stage 2 KC Turbo, ODAWG Ported Manifold, 4" TB Exhaust, Stage 2 AFE Intake, Billet Torque Converter, BPD 58V FICM, BPD Water Pump

2.5" Leveling Kit, 35s, Fusion Bumpers, ProTech Headache Rack, OnBoard Air, and a few other goodies
nighthawk285 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome