[AceGaming]

When I start to accelerate, the car will start to shake around 2K RPM through 3K RPM. It can be visibly seen that the door panels shake. I've already changed out one of the wheel bearings, and both outer tie rods. It doesn't shake when cruising though, only on acceleration from that range. My last suspicion is motor mounts. It feels like it's only shaking when the car drones a bit from that acceleration range. The shake can also be felt through the steering wheel a bit too.

 

[AceGaming]

When I start to accelerate, the car will start to shake around 2K RPM through 3K RPM. It can be visibly seen that the door panels shake. I've already changed out one of the wheel bearings, and both outer tie rods. It doesn't shake when cruising though, only on acceleration from that range. My last suspicion is motor mounts. It feels like it's only shaking when the car drones a bit from that acceleration range.

I forgot to mention it doesn't shake on decel either from that range. Whenever I give it enough gas it vibrates like that too and feels like its shaking a bit. But when I'm constant on the throttle to cruise, it doesn't shake.

 

[lilviper]

When I start to accelerate, the car will start to shake around 2K RPM through 3K RPM. It can be visibly seen that the door panels shake. I've already changed out one of the wheel bearings, and both outer tie rods. It doesn't shake when cruising though, only on acceleration from that range. My last suspicion is motor mounts. It feels like it's only shaking when the car drones a bit from that acceleration range. The shake can also be felt through the steering wheel a bit too.

is it gear independent?

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[RTShadow]

It is generally pretty easy to see if your motor mounts are bad. The rubber will be visibly torn, the top one is really easy to check, bottom one you might have to remove the passenger wheel and engine belt splash guard to get a good look. Also is a good idea to take a peek at the transmission mount too.

This is just the first place to look at as you get started, keeping it simple then move on to more complicated potential causes.

 

[AceGaming]

is it gear independent?

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No, it happens in any gear as long as I give it enough throttle or when starting from a stop at about 20-30mph when accelerating, but doesn't when decelerating to a stop.

 

[lilviper]

No, it happens in any gear as long as I give it enough throttle or when starting from a stop at about 20-30mph when accelerating, but doesn't when decelerating to a stop.

Like RT said, check the motor mounts. My initial thought was Lower control arm bushings, joints or other drivetrain components... but those would be speed dependent, not RPM dependent



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[AceGaming]

Like RT said, check the motor mounts. My initial thought was Lower control arm bushings, joints or other drivetrain components... but those would be speed dependent, not RPM dependent



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Could it also be an axle? The previous owner also said he replaced an axle (or both) from him breaking one. Maybe he didn’t torque it correctly or the other one is going bad? Then again, the car only does shake on acceleration and not when just cruising or decel.

 

[Simon.Starkie]

Clutch...and recent work done in that area?

 

[AceGaming]

Clutch...and recent work done in that area?

The clutch it very strong. Stage 1. What would clutch have anything to do with a shake on acceleration? Wouldn’t it be engine related or suspension related because it’s only under load?

 

[RTShadow]

Something that should have been asked right away, I forgot:

What MPH are you shifting at for each gear?

 

[AceGaming]

Something that should have been asked right away, I forgot:

What MPH are you shifting at for each gear?

No idea. I can be cruising at 45mph and then if I just get on it it’ll start to shake and vibrate. It’ll do it in any gear, as long as I’m accelerating good enough.

 

[lilviper]

Sounds like engine related.

mounts, misfire under load etc..

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[RTShadow]

The "Recommended Reading" threads below will also give you a lot of information related to this problem.

 

[tbagg1ns]

My initial thought was Lower control arm bushings,

I've had to replace LCA bushings twice since owning my srt4 before switching to poly bushings. It would just make this terrible groaning sound going over bumps, but otherwise no violent shaking.

Middle motor mount might be worn too. There's an inspection hole in the passenger side wheel well. If the bolt head is anywhere but right in the middle of the hole, it's starting to go.

 

[Simon.Starkie]

I've had to replace LCA bushings twice since owning my srt4 before switching to poly bushings. It would just make this terrible groaning sound going over bumps, but otherwise no violent shaking.

Middle motor mount might be worn too. There's an inspection hole in the passenger side wheel well. If the bolt head is anywhere but right in the middle of the hole, it's starting to go.

Thanks, good information/tip.

 

[UpShiftSRT4]

If you have 2 known-good spare axles, swap them one at a time and report back.