Newly developed vibration 33-37mph in either 5th or 6th gear on an 8spd

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healthyrx

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Nov 29, 2021
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Location
Oviedo FL
Ram Year
2017 1500 Sport Night
Engine
5.7 Hemi
I have a newly developed vibration that I am noticing. It sounds like something is rattling in the driver side floorboard but it is linked to speed and transmission gear.
It appears intermittently when I am going between 33 and 37 mph in either 5th gear or 6th gear ( i havent narrowed it down to which one yet. As soon as I get out of the gear or lay off the accelerator it goes away and doesnt come back until I am in that gear/speed range again. I am almost tempted to wonder if it is related to the bodylift I just installed as the location of the rattle/vibration seems to be where the driver side body mount location is, but I have that body mount and all others torqued to spec. With regard to the body lift specficially. I installed it and torqued it down then drove 150 miles at highway speed and rechecked torque and nothing had moved.
Is this vibration actually the transmission or is there still a chance its related to the body mount/bushing? If its the transmission will a fluid change help?
 
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