Rear thump

[Mineralram]

Well for quite sometime I put up with the dreaded rear thump when coming to a stop or moving from a stopped position. On my last oil change which was four weeks ago I mentioned it to the service manager and he said let my tranny tech check things out. Good thing I did because he automatically told the service manager that it just needed the new software updates PCM and TCM.
To date so far my truck has not thumped once.


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[bryan28]

Good to hear that. Sounds like you have a good dealer. I hear alot would just claim it's normal and send you on your way. I have a good dealer too and it makes life easy.

 

[huntergreen]

Thanks for posting. Good info to have.

 

[tfeni52355]

Thanks for writing about this. I have it bad in my truck. Will be taking to dealer under warranty.


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[b-rock]

I actually just bought my first ram in February this year and have noticed the "rear thump".

Is there a TSB out for this issue?

Looked for info here in this forum and only found people talking about it being slosh in the 32 gallon gas tank, which is total BS. I have the 32 gallon tank and it is not a slosh effect that I am feeling. Found another thread where people were talking about the rearend/suspension feeling like it is binding, but do not recall ever seeing a solution.

I initially thought it might have been that the rear brakes were being applied more in this truck than in other vehicles I have driven and it was just the calipers letting go causing the thump. Would love to get this fixed!

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[chrisbh17]

FWIW, I feel a little thump in my '17 when the tank is full to 3/4 full. After that it goes away, so I do think there is some truth to the gas tank slosh theory.

Note that I have the 26 gallon tank, but people on another forum have confirmed it too doesn't have enough baffling (which is the issue with the 32 gallon tank) and lets the fuel slosh back and forth when slowing to a stop.

Another thing I saw mentioned was possibly the slip yoke not having enough lubrication or the grease that was there was hardened. Someone cleaned off the old grease and replaced with new and the issue went away.

EDIT: I know Im paranoid about the transmission and it looks like a lot of people tend to jump to that conclusion (I almost did, myself, as well). But the fact it doesnt do it constantly, at least not on my truck, lead me to look at simpler explanations and fuel slosh fits a lot better since its only happening to me for a few days after filling up.

 

[Mineralram]

I actually just bought my first ram in February this year and have noticed the "rear thump".

Is there a TSB out for this issue?

Looked for info here in this forum and only found people talking about it being slosh in the 32 gallon gas tank, which is total BS. I have the 32 gallon tank and it is not a slosh effect that I am feeling. Found another thread where people were talking about the rearend/suspension feeling like it is binding, but do not recall ever seeing a solution.

I initially thought it might have been that the rear brakes were being applied more in this truck than in other vehicles I have driven and it was just the calipers letting go causing the thump. Would love to get this fixed!

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There was no specific tsb number on my paperwork. They described it to me a modified shift schedule which eliminated the thump and it worked for me.


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[b-rock]

FWIW, I feel a little thump in my '17 when the tank is full to 3/4 full. After that it goes away, so I do think there is some truth to the gas tank slosh theory.

Note that I have the 26 gallon tank, but people on another forum have confirmed it too doesn't have enough baffling (which is the issue with the 32 gallon tank) and lets the fuel slosh back and forth when slowing to a stop.

Another thing I saw mentioned was possibly the slip yoke not having enough lubrication or the grease that was there was hardened. Someone cleaned off the old grease and replaced with new and the issue went away.

EDIT: I know Im paranoid about the transmission and it looks like a lot of people tend to jump to that conclusion (I almost did, myself, as well). But the fact it doesnt do it constantly, at least not on my truck, lead me to look at simpler explanations and fuel slosh fits a lot better since its only happening to me for a few days after filling up.

Do you only feel this thump while coming to a stop? If so, I could understand thinking sloshing.

I have experienced the thump as I come to a stop and also right as I take my foot off the brake after being stopped for a period of time, and they feel identical.

The post-stop brake release thump is what makes me dismiss the slosh response.

Timing of a shift point makes sense to me.

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[chrisbh17]

Do you only feel this thump while coming to a stop? If so, I could understand thinking sloshing.

I have experienced the thump as I come to a stop and also right as I take my foot off the brake after being stopped for a period of time, and they feel identical.

The post-stop brake release thump is what makes me dismiss the slosh response.

Timing of a shift point makes sense to me.

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I feel it coming to a stop. I can occasionally make it happen just from letting my foot off the brake then pressing the brake again. However, unless the transmission shifts without showing the shift (I can watch it when in ERS mode), its not an actual shift. If I creep forward and hit the brakes just hard enough, you can do a quick 1 or 2 count then feel the bump. If you creep forward and lightly engage the brakes to a stop, no bump.

The fact that both the "coming to a stop" and "crept forward then hit the brake" both disappear after the fuel level is 3/4 or lower lead me to believe (at least in my case) it is indeed a fuel sloshing thing. I would also expect there to be some other bad things happening if it was a transmission issue.

 

[RamCares]

Thanks for writing about this. I have it bad in my truck. Will be taking to dealer under warranty.

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Hi tfeni52355,
If you find you need any additional assistance while you are working with your dealer, please let us know. Feel free to send us a PM at anytime with additional details.
Julie
Ram Social Care Specialist

 

[tfeni52355]

Hi tfeni52355,
If you find you need any additional assistance while you are working with your dealer, please let us know. Feel free to send us a PM at anytime with additional details.
Julie
Ram Social Care Specialist

Thanks! Will do.


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[tfeni52355]

Thanks! Will do.


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Took my truck into the dealer and had some warranty work done.
1) replaced rear view camera
2) replaced speed control enable/disable switch
3) replaced damaged LED light under dash
4) “troubleshot” rear “clunk”.

All work was done except I got the “this is normal” speech about the rear drivetrain. I am supposed to get a copy of some documentation from FCA since my service advisor asked FCA to back up their words. I will say this for her. She is a great service advisor and understands that I need proof in case the rear is laying on the ground in traffic at some point!

Still waiting on the documentation so stay tuned. I will post what I get from FCA.



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[Mineralram]

Absolute ******** there is an update to the Tcm and pcm and it will be gone had it done on my truck and thump was gone for good


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[tfeni52355]

Took my truck into the dealer and had some warranty work done.
1) replaced rear view camera
2) replaced speed control enable/disable switch
3) replaced damaged LED light under dash
4) “troubleshot” rear “clunk”.

All work was done except I got the “this is normal” speech about the rear drivetrain. I am supposed to get a copy of some documentation from FCA since my service advisor asked FCA to back up their words. I will say this for her. She is a great service advisor and understands that I need proof in case the rear is laying on the ground in traffic at some point!

Still waiting on the documentation so stay tuned. I will post what I get from FCA.



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So here is the response from my service advisor:

Mr. F........

We have reached out to Chrysler but they have not provided us with documentation as of yet regarding the "bump" on deceleration. We have opened another star case with engineering to see if they can fill in the blanks so that you can have something for your peace of mind. Once I'm able to obtain that I can screen shot it and send you a copy. Regarding the issues and tsb's you noted that you'd found online: you are more than welcome to contact the manufacturer, FCA, and voice your concerns. We will advocate at our dealership level, unfortunately, we are held within the perimeters of FCA's warranty guidelines.

The body shop has this email address and should have the information to you regarding the damage, etc. Please let me know if you need any further information from me.

Amanda Lee
Stateline Chrysler Jeep Dodge
803.578.8072

We’ll see if ramcare backs up their words. I sent them a message with this information. They offered to help earlier in this post so lets see if they back up their words.



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[RammerHarder]

So here is the response from my service advisor:

Mr. F........

We have reached out to Chrysler but they have not provided us with documentation as of yet regarding the "bump" on deceleration. We have opened another star case with engineering to see if they can fill in the blanks so that you can have something for your peace of mind. Once I'm able to obtain that I can screen shot it and send you a copy. Regarding the issues and tsb's you noted that you'd found online: you are more than welcome to contact the manufacturer, FCA, and voice your concerns. We will advocate at our dealership level, unfortunately, we are held within the perimeters of FCA's warranty guidelines.

The body shop has this email address and should have the information to you regarding the damage, etc. Please let me know if you need any further information from me.

Amanda Lee
Stateline Chrysler Jeep Dodge
803.578.8072

We’ll see if ramcare backs up their words. I sent them a message with this information. They offered to help earlier in this post so lets see if they back up their words.



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Mineralram is correct... i too, call ********... i had it done to my 14 hemi truck... bump IS gone.
There IS a TSB now, that IS addressing this very issue. It does FIX the 2-1 bump with the transmission when coming to a stop.

If your dealer is not helping you (due to their cluelessness) call chrysler!
This latest TSB was for the DS model trucks only, but can now be flashed to ALL trucks with the 8HP70 transmissions no matter the model.
At first, FCA said they couldn`t flash certain model trucks (TSB was only allowed for DS models), friend of mine had a bighorn, we raised hell about it, finally got it done,
his truck is now fixed.So dont let the dealer or FCA tell you it cant be done. Its just a matter of including YOUR vin number in the TSB and it CAN BE reflashed.

 

[gregs2018ram]

If there is such a TSB that addresses the original issue, then what is the TSB #?????

Mineralram is correct... i too, call ********... i had it done to my 14 hemi truck... bump IS gone.
There IS a TSB now, that IS addressing this very issue. It does FIX the 2-1 bump with the transmission when coming to a stop.

If your dealer is not helping you (due to their cluelessness) call chrysler!
This latest TSB was for the DS model trucks only, but can now be flashed to ALL trucks with the 8HP70 transmissions no matter the model.
At first, FCA said they couldn`t flash certain model trucks (TSB was only allowed for DS models), friend of mine had a bighorn, we raised hell about it, finally got it done,
his truck is now fixed.So dont let the dealer or FCA tell you it cant be done. Its just a matter of including YOUR vin number in the TSB and it CAN BE reflashed.

 

[gregs2018ram]

And what was the TSB # listed on your service order?

Better yet, post a copy of your service order where it states the problem, the corrective action, and the ending result.......

Absolute ******** there is an update to the Tcm and pcm and it will be gone had it done on my truck and thump was gone for good


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[chrisbh17]

And what was the TSB # listed on your service order?

Better yet, post a copy of your service order where it states the problem, the corrective action, and the ending result.......

This!

If the TSB exists, then there is a number and a PDF of it somewhere.

Check out http://www.bbbind.com/tsb-wiring-diagrams/, it might be there.

EDIT: I think its number 21-004-015, dated Jan 24, 2015. Another Jeep site had a PDF: http://www.wk2jeeps.com/tsb/tsb_wk2_2100415.pdf

EDIT2: the idea of "cant be flashed to DS" trucks doesnt make a lot of sense....4th gen (any year) is a DS truck. OPs 2014 is a DS. The TSB I linked to specifies 3.6L only, maybe that was the confusion...its not specified for the Hemi for some reason.

 

[RammerHarder]

And what was the TSB # listed on your service order?

Better yet, post a copy of your service order where it states the problem, the corrective action, and the ending result.......

I`ll see if i can find the TSB they flashed my truck with, but dont hold me to it, the truck has already been traded in last month and i dont have the records for it any longer. All i can tell you is, the TSB FIXED the 2-1 down shift bump issue i had with my hemi sport truck.

Now that i think of it, i`m not quite so sure on the "DS" thing. It all came down to the sales code, so i could be mistaken on that comment. My truck was a sport, and chrysler told me that the TSB was ONLY for the sport trucks. When my buddy tried to get his Bighorn reflashed with the TSB i had done, they said the TSB was not for his particular truck. After a couple months fighting with the dealer and chrysler, they ok`d his Bighorn to be flashed with the same TSB i got for my sport. Both trucks were the same year, had the exact same options, there was no reason for chrysler NOT to flash his Bighorn. His Bighorn was the exact same truck, with exception to one truck has chrome metal bumpers, the sport gets plastic bumper covers. His Bighorn does NOT have the 2-1 down shift bump issue anymore after the TSB re-flash. Him an i both agree, that this TSB changed the shift pattern. I do remember reading that in the TSB that it addresses the 2-1 down shift issue.

What i can suggest in the meantime is, call chrysler and have a case opened up... i was told by chrysler that this latest TSB now covers ALL hemi trucks for the 2-1 bump shift.

 

[MAX RAM]

Any updates on this TSB? I have a 2017 with the exact same problem, but the dealer could not reproduce and said it's normal. This was two weeks ago and they weren't aware of any updates.