Minor , annoying, vibration 45-58 mph?

[P. A. Schilke]

I have the same issue with my truck it starts shaking at 80 and stops at 90 and it’s bad they told me it was nothing they could do and that it was just the characteristics of the truck ristics of the truck they tried five times to fix it

Hi Jeff,

This sounds like driveline balance...Tire balance will not cure this. This is where frequency of vibration you are sensing is key. If you know what your engine RPM are and the transmission gear ratio for top gear you can calculate driveshaft RPM. Divide by 60 and you get the driveshaft frequency If measured vibration matches...then you have id'd the problem..

Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired

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[kieefer]

My truck has never been smooth around 2000-2500rpm and 8th gear. I tried to nail it down by dropping it into neutral to see if a difference would help, it seemed to.
I figured this might take the driveline out of the equation?
Running in S mode my vib was almost unnoticeable.
Still puzzled I bought Accel coils and that helped and kinda pushed the stumble/vib up closer to 2500-3000rpm. No clue why.

I stopped again by the dealership to talk about this and Sync 3.3 but it’s like pulling teeth talking to 20yr old service writers.

I then said screw it I’m going the try a tune. I bought a SCT BDX tuner and that solved my problems. Super smooth throughout the rpm range. I feel sure the stock tune was shifting into 8th, and other gears too soon and lugging the motor.
At least that’s my story and I’m sticking to it.

 

[P. A. Schilke]

Hi Kieefer,

No...shifting in to neutral takes the engine trans out of the equasion, but the driveshaft is still spinning...

Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired

 

[Nutty 5.0]

I'd personally try and get the stock coils back on and take it in to the dealer. IMHO: The Accel stuff is junk. Ford stock coils at least in the mustang realm (Terminators, GT500) are always the choice of high HP. The aftermarket "performance" versions of coils have never been good (Ford anyway).

Hope you get this taken care of soon! That is very annoying and I commute 90 miles a day so would be going batty myself!

 

[kieefer]

Hi Kieefer,

No...shifting in to neutral takes the engine trans out of the equasion, but the driveshaft is still spinning...

Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired

Right, I meant tranny.
If still there you could look at driveshaft and wheels, tires.

 

[2.7EcoBoost]

Truck finally goes in next week. My issue is weird. It can happen at almost any speed from the low 40 mph up to the mid 60 mph range. It's most noticeable when I'm trying to maintain the speed limit on rural roads 45-55 mph as I roll into and out of the throttle maintaining the speed limit. Sometimes if I'm going around 60 ish and let off to slow for a stop sign that is say 100 yards away on a level road where the speed dies down slowly, I will get the vibration until the truck slows below 40 mph then it stops. It's more of an audible sound than a seat of the pants feel. I am afraid I'm going to get the infamous "no problem found", "it's normal, within spec" garbage. I would guess it's a gear lash issue, either in the drive shaft yoke or the rear end, but it's slight and I know it will likely be hard to diagnose and fix. It doesn't do it under acceleration or if I'm going down a hill that's steep enough for the truck to gain speed. It's just in that in between, light load area. Was much more noticeable the other morning when it was 12°F outside...... I'll give an update next week.

 

[hibusa2005]

Hi Jeff,

This sounds like driveline balance...Tire balance will not cure this. This is where frequency of vibration you are sensing is key. If you know what your engine RPM are and the transmission gear ratio for top gear you can calculate driveshaft RPM. Divide by 60 and you get the driveshaft frequency If measured vibration matches...then you have id'd the problem..

Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired

thank you now i at least have something to try sorry it took so long to reply but i have been so busy. i will let you know what i find out. and lets say this is the problem is this a warranty problem and if so how do i get them to fix the issue? i am not sure how schooled there mechanics are at the dealer. i guess my other option would be to request a engineer from ford and see if they are going to have one in the area if he could look at it.

 

[hibusa2005]

Hi Jeff,

This sounds like driveline balance...Tire balance will not cure this. This is where frequency of vibration you are sensing is key. If you know what your engine RPM are and the transmission gear ratio for top gear you can calculate driveshaft RPM. Divide by 60 and you get the driveshaft frequency If measured vibration matches...then you have id'd the problem..

Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired

i took this yesterday i am in tenth gear so am i to take 2300rpm x 10th gear and divide that by 60? how does that id my shaking problem

 

[P. A. Schilke]

i took this yesterday i am in tenth gear so am i to take 2300rpm x 10th gear and divide that by 60? how does that id my shaking problem

Hi Jeff,

Okay...need a bit of help here from some members that know the 10th gear ratio... I do not know this, but the engine is operating at 38.3 HZ first order, so them divided by the Overdrive ration will give your the driveline frequency This will give an approximate idea of if it is first order driveline imbalance or 2nd order Powertrain bending. If suspect to be driveline imbalance, then there is a process using hose clamps to rebalance the driveline on the vehicle. Iterative process and somewhat time consuming but can if done properly result in amazing help...

Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired

 

[RedlandRanger]

Hi Jeff,

Okay...need a bit of help here from some members that know the 10th gear ratio... I do not know this, but the engine is operating at 38.3 HZ first order, so them divided by the Overdrive ration will give your the driveline frequency This will give an approximate idea of if it is first order driveline imbalance or 2nd order Powertrain bending. If suspect to be driveline imbalance, then there is a process using hose clamps to rebalance the driveline on the vehicle. Iterative process and somewhat time consuming but can if done properly result in amazing help...

Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired

According to this page: https://www.transmissionrepaircostguide.com/10r80/

Here are the ratios:

First – 4.70
Second – 2.99
Third – 2.15
Fourth – 1.80
Fifth – 1.52
Sixth – 1.28
Seventh – 1.00
Eighth – 0.85
Ninth – 0.69
Tenth – 0.64
Reverse – 4.87

 

[P. A. Schilke]

According to this page: https://www.transmissionrepaircostguide.com/10r80/

Here are the ratios:

First – 4.70
Second – 2.99
Third – 2.15
Fourth – 1.80
Fifth – 1.52
Sixth – 1.28
Seventh – 1.00
Eighth – 0.85
Ninth – 0.69
Tenth – 0.64
Reverse – 4.87[/QUOT

Hi Rob,

Thanks! so Driveline first order is 25.5Hz for the driveline... Now the tough part is to for Jeff to use his calibrated assometer and see if he can tell if the frequency is more like 38.3Hz or 25.5hz. If an accelerometer could be mounted on the seat track like we did at Ford for quick and dirty analysis, it would be great, but not usually something a owner has...Some Multimeters have frequency capability... If you have heard an A/C hum in a speaker, that is 60Hz which gives some reference... If the vibration is much higher than 25.5Hz, then it could be 2n order powertrain bending, First step for powertrain bending is to loosen and retorque the transmission bellhousing to RFOB (Rear Face of Block). and see if that changes or eliminates the vibration. The human ear can detect between 20Hz to 20K Hz.... So this vibration should be able to be heard as well as felt...

Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired

 

[2.7EcoBoost]

Ford has a specific maintenance procedure to carry out in the manuals on how to check for vibrations.
are any of these dealers doing it as per that? or are they all just throwing in the towel after re-balancing the tires?

The incompetent dealer admitted to feeling something there. They rebalanced all 4 tires and rechecked and said it's normal. I almost didn't buy this truck because there is not a good Ford dealer with in an hour and a half. If what I'm hearing/feeling was normal on all Rangers, I'd accept it. That's why I made a post, to see if it was common and apparently it's not. Just a minor vibrating noise that can be heard and felt. Goes away with load changes on the driveline. It's not speed related as much as it's related to the load. Frustrating to say the least. I'll likely have to diagnose it myself come warm weather.

 

[hibusa2005]

N I thought you guys might get a kick out of this. As I read this it’s saying to me that Ford told him no further action or testing should be done and it’s just characteristics of the truck Unbelievable

 

[EcoRanger]

http://fordauthority.com/2019/12/2019-ford-ranger-owners-complain-of-low-speed-vibration/

 

[Mokume]

N I thought you guys might get a kick out of this. As I read this it’s saying to me that Ford told him no further action or testing should be done and it’s just characteristics of the truck Unbelievable

Not to make light of your issue, but, quite frankly I am amazed that the dealer would allow their mechanics to drive at such speeds to simulate your concern.

Unless, of course, you live in Alabama, a little town in Germany!

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