Vibration at 25 MPH slowing down

[john2015]

Is the vibration only when the fuel management goes into 4 cyl.? I took my 2015 Sierra to the dealer for that at 30-45mph.They told me its because of the firing order it goes to.

[FlintBorn]

Did you ever find out what is causing the shudder? my 2008 Silverado is having the same problems and I everything you did to try and fix it, I also took it into my local garage and they were stumped. Thanks for the help 

[flyingfool]

have the dealer install a new torque converter, see if this cures the vibes

[Florabama]

I have a 2018 w/t regular cab that I just noticed doing the same thing. Low speed vibration.  25 mph and there about. But I didnt notice mine till I put a pair of leveling shackles on the rear springs. It may have already been there but I think I would have noticed it. Not sure since I just got the truck. Is yours lowered?

[Florabama]

I put 2" drop shackles in the rear.  Looks like you said they fixed yours with motor mounts? Mine is in the shop now. I didnt mention I lowered it. What mine does is coasting down from 30 it starts vibration and when it hits 25 it's real bad and continues till I stop. Put truck In Neutral and it goes away. I mentioned the motor mount tab to the writer and he said that was just for rough idle. Did it fix your vibration at 25?

[flyingfool]

does it go away when you press tow haul or tap the brake pedal during the shudder?

[rlcole321]

I just bought a 2018 Silverado and one of the things I noticed is this same "vibration/shuttering" when slowing down for a stop light. I think it is the Transmission control going through the downshift process. I notice it does not do it when I do the "Manual" downshift coming to a stop. It's like it is clutch packs for 3rd and or 2nd gears aren't "fully" engaged yet when downshifting.

[TexDvlDog]

You may not think this would cause it but I bet top dollar it’s your front shocks. I have had an issue similar to your issue only it would happen when I would apply the brake at high speeds (i.e. exiting a freeway) and I can feel in the wheels and shake/vibration that would travel up to my steering wheel. And it would get worse as time went on, and me replacing pads/rotors and balancing all tires and rotating. This happened on 2 different types of vehicles that I’ve personally owned and 1 that my brother experienced the same  issue on his car and it was fixed when he replaced the front shocks. It happened on a 2015 Ford F-250/2008 Dodge Charger/2012 Toyota Avalon. Front shocks were the cause. 

[Marcus Smith]

This issue has recently been happening with my Cadillac SRX. I have recently installed new pads and rotors on the front wheels and rotated the tires. When doing the brakes I noticed a stabilizer rod was broken but was not having any issues so I didn’t jump right on it. The vibration got worse so I just repaired that and it seemed to help but there is still a vibration at that speed when slowing down. I thought maybe the tranny was not down-shifting correctly but I dropped it into neutral and there was still the vibration when slowing.....and I am not touching the brakes when this happens. It needs to go to the shop to replace an exhaust manifold gasket, I will have them take a look. Will advise what they come up with.

[pokismoki]

you usually will NOT feel out of balance wheels while driving, the vibe problem is connected to the transmission 

if you feel vibes while under braking, then your rotors are overheated and warping

Edited September 20, 2022 by pokismoki

[MiGlez]

Has anyone found the answer to the rumbling noise?

[Tlenzi]

Happened on my ‘18 High Country. It’s a transmission shudder. Service bulletin has dealers changing transmission fluid to a different type. Be prepared to pay. It’s a bulletin not a recall.