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Random thumping under floor boards..

jmetz

By jmetz
in Troubleshooting & Recalls

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jmetz New Member

jmetz

Posted
Posted

Hi so last night my truck started doing something it never has before..i was driving for about an hour before i parked it and it drove just fine, no rpm jumps or vibrations or shuddering etc..it shifted perfectly fine as well, but then when I put my truck in park it started randomly making a thumping, not steady just random intervals..can't hear nothing can only feel it in the floor boards, and I repeat it only does it in neutral or park, whenever it's in gear it perfectly fine, I drove it around a bit again after I first caught to it and it still shifted perfectly fine, I have good idea what it sounds and feels like when trans is going or convertor is shot, I also just did a transmission recalibration and got the oil changed one yr ago cuz it was doing the vibration and bit of rough shifting and stuff and that cleared right up..so anyway I read up on forums a bit and can't find anything super similar to what I'm experiencing so hopefully someone has some input? Thanks!

jmetz New Member

jmetz

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FYI I just tried it again this morning and I cudnt get it to do it, drove forward a bit then I put into reverse to back up again and that triggered it, it made it bit of a slipping feeling then the thumping started faintly then when I put it into park it kept thumping..🤷‍♂️

rav3 Senior Enthusiast

rav3

Posted
Posted

What year, model, transmission & miles might help. Any mods? R u the original owner? Any maintenance done?

jmetz New Member

jmetz

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Posted (edited)

It is a 2016 GMC Sierra 1500 Denali, 8 speed transmission, 217,000 km...no mods other then I recently put a different set of wheels on..but they are the stock 22" Denali wheels with 33" rubber..as well as regular maintenance yes

Edited by jmetz
mikeyk101 Senior Enthusiast

mikeyk101

Posted
Posted (edited)

What about a broken motor mount(s)?

 

Maybe have someone in driver's seat with foot on brake and in gear. Slightly press the accelerator a few times and see if motor rises up some when doing that?

Edited by mikeyk101
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