Violent shake when letting clutch out

[fred807]

I usually start from lights in second because 1st is too..... everyone knows. Recently it has been shaking pretty violently from any standstill start in 1st or second. It only shakes while im letting the clutch out, after its engaged all is well. Another thing is, when I started it this morning to let it warm up, somehow it jolted backward while in neutral. Glad I was inside or else i wouldve had a compacted prius permanently attached to my trailer hitch.
Truck is a 95, 4wd, brand new u-joints, etc.
Thoughts?

[madpogue]

Was it in neutral, or was it in reverse with your foot on the clutch? That may be a sign of a clutch disengagement issue; hydraulics going bad, or the god-awful bushing on the pushrod eyelet in the cab, or the just-as-god-awful big bushings in the pedal assembly.

As for the shaking on launch, could be motor or tranny mounts. Also, are you running the OEM dual-mass (aka dumb-mass...) flywheel?

Hmm, I don't find first gear launches too bad. The ZF6 has a really low granny-ish first gear, so I think they're typically launched in second. But our ZF5s are geared pretty "normal". 'Course, both my wife's trucks are 3.55s; 4.10s would spin faster on launch. What axles you running?

[fred807]

dana 60 up front and 70 in the rear. 4:10s as well. I will have to look into the mount issue because I did have other symptoms that would point to a broken/loose motor/trans mount(s). as for the reverse incedent, it may have been my own fault. mornings arent my thing, but as far as i remember, it was in neutral and just jerked back a bit.
OEM flywheel as far as I know. only bought it 5 months ago so it could really be anything.
probably going to eng up tearing a tranny apart this weekend to see if the springs are f'd or if the clutch plate is uneven.

[Daxman]

My wifes toyota was shaking pretty bad when we would take off in 1st gear. It wouldnt do it in any other gear. They said the flywheel had hot spots on it and thats what was making the jerking or bouncing when we took off. I dont know how old your clutch is, but sounds like it may be on its way out.

[fred807]

I was told that there are springs that go bad in the dual mass flywheel that cause this.

[elrojo63]

Get yourself a single mass and be done with it


Sent from my Autoguide iPhone app

[Nitro41]

Check and make sure your driveshafts are tight. I had some wird problems with vibrations and ended snapping the output housing off my trans....Not somthin you want to replace trust me.