Vibration issues

Hi there,
I have a 2016 Toyota Tacoma TRD sport four-door it is factory stock.
I noticed yesterday when I went to go step out with the family prior to this I did let the truck warm up for about 10 to 15 minutes. As I proceeded to head out I noticed between maybe second third and fourth year at low speed between 30 to 40 mph the truck was vibrating. I have dealt with the vibration issue before in the past at 50 mph I took it to the dealer and they flashed A software to the transmission which it did take care of this issue. But now I am dealing with the new issue between 30 to 40 mph vibration on city Street. It’s only tends to happen if I am cruising or if I let go the throttle and then I get back on it for not stepping it down just slowly increasing the throttle as when I have noticed it. I know a couple of Youtubers say that from factory the transmission oil tends to be low which is a cause of the vibration. Does anybody have any feedback or information on Justin could help me out. I am going to the dealer on Wednesday. but I would like to have an idea of what is causing this?

 

I would start with the obvious, looking at tires and verifying lug nuts are torqued. Beyond that, I might be checking trans fluid level and condition. There are too many possibilities to point to with certainty.

 

I was thinking is it possible that it could be the spark plugs? since I’ve had the vehicle I have not changed them not even once. The truck currently has about 86,000 miles.

 

Sure, that's possible, but if you were indeed misfiring that much, it would set a check engine light with some range of P3XX codes.

 

I did check lug nuts are torqued. Isn’t the transmission fluid in closer there is no way of checking it?

 

I have a manual trans so I am not up to speed on the auto procedure but there is no dipstick. I think you can use TechStream if you have it otherwise, the dealer will have to check it.

 

no there isn’t no dipstick. I did change the spark plugs but it still doing the same thing although the spark plugs did need to be changed but that was not the cause of it. I’m thinking that I might half to have the dealership check the transmission fluid as well as reflash the computer of the transmission again. I greatly appreciate all your help and all the information you provide it to me.