Vibration from stop to 10mph on a new 2021.

[silverflash]

Is this a big deal if I don't go to dealer. They will only say they don't feel it. I hate going to dealers.

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[Jason B]

TSB 20-2277 2019-2020 Ranger - Shudder/Vibration When Accelerating From A Stop | 2019+ Ford Ranger and Raptor Forum (5th Generation) - Ranger5G.com

 

[silverflash]

Yeah. Saw that prior to posting. They will say doesn't apply as it's a 21. Lol. It's not that big of a deal but if it casues other issues it is?

 

[navsnipe]

Yeah. Saw that prior to posting. They will say doesn't apply as it's a 21. Lol. It's not that big of a deal but if it casues other issues it is?

Who is they? The driveline is the same as 2019 and 2020. Only the Tremor has a different driveline, it has a cv on the rear most position of the driveshaft instead of a universal joint.

 

[Joeiconic]

It’s not uncommon when new, but goes away for most. Read the manual section on the adaptive transmission. I had it when new, but it gradually improved and was pretty much gone by 2500 miles, or so.

 

[Gibs45]

I can confirm that this problem went away for me after around 2,000 miles. It was very noticeable at first and I was skeptical that the transmission wouldn't smooth out but it definitely did (for met at least).

 

[Samsquanch]

One more vote for it probably goes away. I would have said no way in the beginning but mine smoothed out considerably. I would give it a little while.

 

[Skoth]

2,500 miles on my 2021 and it has gone away by about 85% on its own.

 

[silverflash]

Interesting. Will let it ride as taking to dealer will prolly casue more issues. Lol.

 

[Porpoise Hork]

Is this a big deal if I don't go to dealer. They will only say they don't feel it. I hate going to dealers.

I did research on this and discovered that the AU market has already had to deal with this when they lifted their trucks and aftermarket center bearing shim kits are a thing. This research also identified that Ford raised the NA ranger rear suspension by use of alternate hardware and shim plates but likely did not compensate for this in the driveshaft angle thusly introduced what's known as Second Order Vibration. So I tested it by adding alignment shims to alter the driveshaft angle and eliminated the vibration as a result. It took 3/8" worth of shims and longer bolts to fit them in order to resolve it on my truck. Others have tried this and found similar results, but some have not. It may take a different amount of shims to resolve it on yours. Also have the Dealer check the transmission fluid level. A large number of Mustang, F150, and some Rangers (mine included) found that the transmission was underfilled by the factory by 1.5-2 qts. This can also cause minor issues with torque converter cavitation and can present as a minor vibration at low speed acceleration.

https://www.ranger5g.com/forum/threads/vibration-at-take-off.2092/page-7

 

[P. A. Schilke]

I did research on this and discovered that the AU market has already had to deal with this when they lifted their trucks and aftermarket center bearing shim kits are a thing. This research also identified that Ford raised the NA ranger rear suspension by use of alternate hardware and shim plates but likely did not compensate for this in the driveshaft angle thusly introduced what's known as Second Order Vibration. So I tested it by adding alignment shims to alter the driveshaft angle and eliminated the vibration as a result. It took 3/8" worth of shims and longer bolts to fit them in order to resolve it on my truck. Others have tried this and found similar results, but some have not. It may take a different amount of shims to resolve it on yours. Also have the Dealer check the transmission fluid level. A large number of Mustang, F150, and some Rangers (mine included) found that the transmission was underfilled by the factory by 1.5-2 qts. This can also cause minor issues with torque converter cavitation and can present as a minor vibration at low speed acceleration.

https://www.ranger5g.com/forum/threads/vibration-at-take-off.2092/page-7

Hi Bret,

It is 2nd order relative to driveshaft rotation rpm which is first order. U joints are 2nd order excitation generators. Your shimming is to reduce the excitation to the point of being unnoticable and let the center bearing do its isolation job. This is why frequency is important...do not want to guess it is 2nd order...with frequency you know it is 2nd order...

 

[Porpoise Hork]

Hi Bret,

It is 2nd order relative to driveshaft rotation rpm which is first order. U joints are 2nd order excitation generators. Your shimming is to reduce the excitation to the point of being unnoticable and let the center bearing do its isolation job. This is why frequency is important...do not want to guess it is 2nd order...with frequency you know it is 2nd order...

Phil,

I was just quoting the link stating improper driveshaft angles can cause the type of vibration like that found with the Ranger. It is listed as that on multiple sites on the topic as well what a local driveshaft specialist shop told me was the issue when I had them inspect the driveshaft balance after adding the shims. They confirmed that the shaft was balanced, rather haphazardly due to there being counter balance weights but it was in balance.

 

[P. A. Schilke]

Phil,

I was just quoting the link stating improper driveshaft angles can cause the type of vibration like that found with the Ranger. It is listed as that on multiple sites on the topic as well what a local driveshaft specialist shop told me was the issue when I had them inspect the driveshaft balance after adding the shims. They confirmed that the shaft was balanced, rather haphazardly due to there being counter balance weights but it was in balance.

Hi Bret,

Yep...the orders are relative to some 1st order If it was tire first order for example, 2nd order would be tire ovality. If driveshaft u joints there would then be a 3.73 factor for axle ration for relation to tire 1st order If engine first order on our I4 engines, then 2nd order would be the inherent shaking forces of an I4. and driveline would be a factor of the transmission gear ratio when the frequency was captured... In other words...several ways to skin the cat.

Glad shimming the center bearing worked for you. Wish it was the fix for most of Rangers, but some seem to defy solution. I really hope the 6G has a single piece driveshaft and just take the expensive center bearing out of the picture... The 1974 SuperCab launch (Dodge had the one up on us with their Club Cab) was a problematic launch due to this very issue, and just like Ranger 5G, shimming the center bearing worked for 75% of the vehicles and the other 25% defied fixing completely..

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