Tranny vibration help
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Freshman User
Joined: Sep 2015
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Tranny vibration help
EX is a 2000 PSD 4x4, 165K ODO. I have been looking for a fix for this 4r100 vibration for a while with no success. Issue started up in early 2016 and nothing I have done has made it better.
I am resolving myself to this tranny starting to go, but I need some input from others with more experience than myself. Any help is greatly appreciated.
The symptoms are as follows:
I am resolving myself to this tranny starting to go, but I need some input from others with more experience than myself. Any help is greatly appreciated.
The symptoms are as follows:
- No issues with trans shifting. quick and precise, no hunting. Quick lockup of TC.
- No vibrations in 1-3 gears.
- Vibration feels like it is coming through the floor, possible through the trans crossmember.
- 4th gear vibrations and hum above 50 mph.
- If I accelerate hard from a start through all four gears, 1-3 are perfect. When it shifts from 3-4, as soon as it drops to 4th gear, a hum and vibration is felt. If I floor it in 4th gear hum runs through whole body and vibration is at its worst.
- If I am above 50mph cruising in 4th, and I turn off OD, it immediately goes away. If I floor it, no vibrations. Shift back into 4th hum and vibes are there.
- Usually the vibration goes away over 72mph.
- During a single trip, vibration gets worse as time goes on, especially bad on trips over 45 minutes on the highway.
- Last night, after a 2 hour drive in stop and go traffic, it got worse no matter what speed over 50mph I was, which indicates to me the situation is starting to degrade.
- In 3-4 gear, especially in 4th gear cruising, there is what I would describe as massive gear lash that can be felt when blipping the throttle only when it is warmed up. While in 4th gear only, there is an audible metal clang that accompanies the lash on either side of the slop. In 3rd gear, the lash is felt, but no sound. I had my diff guy check to make sure its not the diff, and he said diff slop is within tolerance. I checked how much slop there is in the diff and with the trans in neutral, it is maybe 1/8". Sound and feel was the same after the diff service.
- Temps on tranny (sensor at trans side port) typically between 130-150*F, never above 180*F since I've owned it since 2015. Has a 31 row cooler.
- Original owner used it since brand new to primarily haul an 8K lb trailer long distance and the previous owner would travel most of the time with OD off.
- Rebuilt Transfer Case installed in 2016. No Change
- Driveshaft rebuilt in 2016 with new slip joint, ujoints and balanced twice. No change
- New springs all around. Removed the anti-wrap half leaves (lack of a better term). Checked ujoint angles and adjusted pinion angles within .5* of each other
- New HD Ford TC and Flex Plate installed 1/2017. No Change.
- Flushed Tranny 1/2017. No Change
- Complete rebuild of rear axle with new trutrac, brake pads, emergency brake mechanism and pads, and bearings. No Change
- New wheels and tires installed 2/2018. I though for a while this would be part of the issue, but no change in vibration.
- Motor Mounts appear to be in good shape. Tranny mount seems good, but I was thinking of replacing it just to be sure.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,717
Likes: 2,642
From: SE Florida
I don't see that as making it something in the transmission. When OD is off the engine runs faster. That will mask many problems in the engine, such as a miss. This sounds like a miss to me.
Posting Guru
Joined: Feb 2015
Posts: 1,394
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From: Loveland,CO
Does it make any noise in idle? Mine was similar and I had the transmission rebuilt, mainly cause I wanted to, but in the end the flex plate was broken and that was probably causing the symptoms.
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Freshman User
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Not that the flex plate could be broken, but I think its unlikely as the symptoms didn't change after the install of the new one a year ago.
It may not be related but it seems it might be.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,717
Likes: 2,642
From: SE Florida
It could be something in the transmission. I'm really bad at diagnosing noises that I can't hear in person.
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FTE Chapter Leader
Joined: Nov 2010
Posts: 30,593
Likes: 1,236
From: N. IL
X2, a bad cop feels like a transmission issue at freeway speeds. Especially in OD. No need to replace them all, just the bad one. May or may not throw a code.
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Mountain Pass
Joined: May 2016
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Does the issue "fix" itself after you punch it and force a downshift? If so, likely coil pack.
Get a code reader and hook it up. The CEL won't come in because once the tranny kicks into a lower gear, the computer thinks the issue is "fixed." However, it will store a code outlining which cylinder you have the misfire on.
If you move the rail during install, go back and check your injector clips. They are brittle and easily crack. After I installed mine, I had another misfire appear on a different cylinder... went back and had noticed injector clips snapped on 2 different injectors. Zip ties fit perfectly where the clips break so I tied them up and was good to go.
Good luck!
Thread Starter
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Freshman User
Joined: Sep 2015
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Agreed. My guess is a bad coil pack. When it happened to me, I thought it was the tranny at first as well.
Does the issue "fix" itself after you punch it and force a downshift? If so, likely coil pack.
Get a code reader and hook it up. The CEL won't come in because once the tranny kicks into a lower gear, the computer thinks the issue is "fixed." However, it will store a code outlining which cylinder you have the misfire on.
If you move the rail during install, go back and check your injector clips. They are brittle and easily crack. After I installed mine, I had another misfire appear on a different cylinder... went back and had noticed injector clips snapped on 2 different injectors. Zip ties fit perfectly where the clips break so I tied them up and was good to go.
Good luck!
Does the issue "fix" itself after you punch it and force a downshift? If so, likely coil pack.
Get a code reader and hook it up. The CEL won't come in because once the tranny kicks into a lower gear, the computer thinks the issue is "fixed." However, it will store a code outlining which cylinder you have the misfire on.
If you move the rail during install, go back and check your injector clips. They are brittle and easily crack. After I installed mine, I had another misfire appear on a different cylinder... went back and had noticed injector clips snapped on 2 different injectors. Zip ties fit perfectly where the clips break so I tied them up and was good to go.
Good luck!
Fleet Mechanic
Joined: Oct 2010
Posts: 1,997
Likes: 206
From: South Eastern Michigan
I have a similar issue. Between 45 and 50, in OD, i get a vibration, sort of a shudder. Im sure its the trans. No other issues and I just had the fluid flushed. I tried it in third at the same RPM, slower speed obviously, and no vibration. Trans has around 50k on the rebuild. All the updates and a good convertor. Beyond pouring in some Lucas snake oil, not sure what to do other than drive it and wait.
Veteran/Sheepdog
Joined: Feb 2012
Posts: 6,047
Likes: 110
From: Western AR
I had the OD "shudder" in the Expedition recently. It felt AND sounded like I was driving over rumble strips when it would go into OD. 4R75W ended up having a broken OD servo and a defective internal part from the factory "assembly day". Completely rebuilt it in my garage with a Transgo shift kit and several new parts to replace the damaged ones. Runs great now. Don't be afraid to rebuild your own if it needs it. It is not that hard. You need to have good "attention to detail" skills and some hand tools. A small arbor press comes in handy, or you can make one like I did.
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Freshman User
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WiFi dongle for the OBD II port and Torque Pro. Will do most of what Autoengenuity and the other computers will do (like buzz test), and you can watch all the data the computer monitors in real time.
I had the OD "shudder" in the Expedition recently. It felt AND sounded like I was driving over rumble strips when it would go into OD. 4R75W ended up having a broken OD servo and a defective internal part from the factory "assembly day". Completely rebuilt it in my garage with a Transgo shift kit and several new parts to replace the damaged ones. Runs great now. Don't be afraid to rebuild your own if it needs it. It is not that hard. You need to have good "attention to detail" skills and some hand tools. A small arbor press comes in handy, or you can make one like I did.
I had the OD "shudder" in the Expedition recently. It felt AND sounded like I was driving over rumble strips when it would go into OD. 4R75W ended up having a broken OD servo and a defective internal part from the factory "assembly day". Completely rebuilt it in my garage with a Transgo shift kit and several new parts to replace the damaged ones. Runs great now. Don't be afraid to rebuild your own if it needs it. It is not that hard. You need to have good "attention to detail" skills and some hand tools. A small arbor press comes in handy, or you can make one like I did.
In my case, I would not describe it a shudder, but the rumble strip at speed does sound like my issue.
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,604
Likes: 149
From: SE Georgia
very good read. I too am chasing a rumble in OD. going to try full tune-up and live feed for injectors to see if bad coil pack. never considered that a miss could cause this. she's only 93k young...pretty sure on 18yr old plugs also