Violent shaking and clank when letting on/off gas -- not cv axle?

[snapshot]

After lowering my car there has been violent shaking between 30-60mph while accelerating, going away before and after and when not accelerating. On top of this, there is a clank and what feels like a shift of weight when letting on and off the gas and breaking. Searching this forum, the general conclusion for this seems to be a ripped cv boot but I have checked mine and they are 100% ok. I have replaced my rear motor mount with a hasport one. I understand an alignment would play a role but this is only while accelerating and wouldn't explain the clunk. Could it be LCA ball joints? Transmission mount also sounds possible but I dont see how that would start after lowering. Thank you very much for any suggestions!

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[Jason Baker]

Have you checked the jack shaft bolts? The bolts that hold it to the motor?
Can you tell if it is more to the Right side of Left side of the vehicle?

Maybe try putting the OEM RMM back in and see what it does?

 

[Doc_Mello]

Have you checked the jack shaft bolts? The bolts that hold it to the motor?
Can you tell if it is more to the Right side of Left side of the vehicle?

Maybe try putting the OEM RMM back in and see what it does?

I think you circled the incorrect part, mate.

OP: with what did you lower the vehicle?

 

[Jason Baker]

I think you circled the incorrect part, mate.

OP: with what did you lower the vehicle?

No I was serious with that yellow circle. If the shaking ONLY occurs when in gear and on/off the gas, the issue may be in the drive-line somewhere. The only reason I would rule this out is because they still spin regardless of transmission status. The bolts that hold this bearing assembly are very short and prone to back out. If 2 loosened, or even 1, it could cause serious vibration.
This little fella right here. A half shaft. (not an axle)

Honda 44500-TBF-A00
Shaft Assembly, Half
2017-2020 Honda 44500TBFA00

OR...... could it be the

Honda 44310-TBF-A01
Joint Complete, Inboar
2017-2020 Honda Civic 44310TBFA01

Let's start with the part that was changed most recently though and go from there??

 

[Jason Baker]

Also curious..... the Hasport RMM has some really bad NVH. When you say "violent shaking", could you possibly be feeling the RMM doing it's job?

 

[Romeoridgee]

get lower ball joint spacers also known as roll center adjuster, when lowering your car the angle of your lower control arm is more flat. ball joint spacer will lower the mounting point of arm to joint bringing back the correct angle needed. alignment is also needed because toe changes when lowering.

 

[Doc_Mello]

No I was serious with that yellow circle. If the shaking ONLY occurs when in gear and on/off the gas, the issue may be in the drive-line somewhere. The only reason I would rule this out is because they still spin regardless of transmission status. The bolts that hold this bearing assembly are very short and prone to back out. If 2 loosened, or even 1, it could cause serious vibration.
This little fella right here. A half shaft. (not an axle)

Honda 44500-TBF-A00
Shaft Assembly, Half
2017-2020 Honda 44500TBFA00

OR...... could it be the

Honda 44310-TBF-A01
Joint Complete, Inboar
2017-2020 Honda Civic 44310TBFA01

Let's start with the part that was changed most recently though and go from there??

OH! I was confused by the wording.

Good clarification, TY, and good knowledge!

 

[Jason Baker]

OH! I was confused by the wording.

Good clarification, TY, and good knowledge!

Listen
This is darts at a board. I’m not a trained mechanic here. I just look at shit.

 

[snapshot]

Also curious..... the Hasport RMM has some really bad NVH. When you say "violent shaking", could you possibly be feeling the RMM doing it's job?

This was happening before the motor mount and I installed it to try and fix it. It literally feels like the front of my car is going to fall apart.

 

[Jason Baker]

This was happening before the motor mount and I installed it to try and fix it. It literally feels like the front of my car is going to fall apart.

Damn. Ok so it was suggested that you may need an alignment or to look at your suspension geometry.
Any chance you could record video of this?

 

[LBP]

Double-check everything you touched when installing your lowering springs or coilovers. Sounds as though this occurs during changes in suspension load. Could be as simple as having forgotten to tighten a control arm bolt.

 

[Jason Baker]

Now I see. You did mention you lowered it. My bad Homie

 

[PHubb]

Just spit balling here - Is your car CVT or M6 transmission? We used to have a similar sounding problem on the rear drive, front engine Porches (928, 944, etc.) It was the rubber bushings in the clutch pressure plate coming apart. Reuired replacing clutch assembly.

 

[tacthecat]

Is there a chance you lowered the car too much and the drive-shaft flex joints are binding?

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