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Old 04-12-2004, 04:17   #1 (permalink)
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Driveline moves back and forward when driving

This is starting to bug me, mainly because of what it might mean. It's happened since I've had the car but the XR springs have made it occur at lower speeds.

When I'm driving at any speed, the gear shifter moves back and forward. Starts at about 60 and moves fairly smoothly, maybe a cm in either direction. Above 100 it shakes violently and above 130 or so it's bloody scary, you can feel it through the whole car.

What the hell could be causing this? The engine mounts seem alright, looking at the engine idling it moves from side to side and that's it. Transmission crossmember? A few loose bolts?
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Old 04-12-2004, 06:22   #2 (permalink)
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Re: Driveline moves back and forward when driving

Yeah it definitly shouldnt move like it was. Ive been in his car and even bumps in the road make the whole gearbox move in all directions. Theres only 3 points of attachment so there must be something wrong with either engine mounts and transmission mount. It would be doing it at lower speeds because the suspension wopuld have been soaking up some bumps before you changed it.
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Old 04-12-2004, 13:10   #3 (permalink)
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Re: Driveline moves back and forward when driving

Back and forward, or sideways?
Sounds like it could be the rear tranny mount. Certainly the engine mounts wouldn't cause it. Is the shifter assembly bolted down still? Hasn't come loose at all?
I would think if the tranny mount was that bad, you should be able to move the back of the box around by hand, with a bit of effort. Although it would have to be really screwed, they are designed to hold the box still even if the rubber's gone.
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Old 04-12-2004, 15:29   #4 (permalink)
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Re: Driveline moves back and forward when driving

How low did you go? If the tailshaft is hitting the tunnel at the back it will cause these vibes, and the box to jump around.
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Old 04-12-2004, 16:37   #5 (permalink)
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Re: Driveline moves back and forward when driving

i'd also look at the k-frame bushes while you are at it
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