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22nd January 2017, 13:06 | #1 |
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Vibration when changing gear (auto)
Hi all,
I have a Mk2 R75 V8 automatic which has covered 39K. I'm getting a vibration from the back of the car when it drops from 3rd into fourth at between 50 and 70 mph when briskly accelerating. It's an odd one as all the auto gear changes are smooth and it won't do it urban speeds. Any ideas I can go armed with the garage would be helpful. Thanks |
22nd January 2017, 17:38 | #2 |
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Sounds as if the torque is overpowering the clutch in the box. Could be low oil pressure. Check oil level and perhaps clean filter in sump.
Also check gear lever adjustment. Assuming no wheel spin activating the LSD.
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22nd January 2017, 18:39 | #3 | |
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Quote:
Definitely no wheel spin - the car is already at cruising speed. I think an oil change would be a first call of port - as far as I'm aware the auto transmission oil hasn't been changed since the car was new. |
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23rd January 2017, 06:29 | #4 |
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It sounds as if the gear change is not adjusted correctly.
If the car does not start in N or P, the lever is not correctly adjusted to trigger the inhibitor switch. If they have adjusted that right, it is still possible that the gear selector on the box is not adjusted correctly to go into top and OD. If almost there, the box will tend to hunt as if it will try and shift, but it will be reluctant to do so. There is an adjustable rod from the lever on the shift box to the gearbox, running under the shifting console.
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23rd January 2017, 08:40 | #5 | |
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Quote:
Thanks for the suggestions. I've got it booked in at my local MGR specialist to see what they make of it. |
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17th May 2018, 13:10 | #6 |
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Did you ever sort the problem?
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23rd January 2017, 06:48 | #7 | |
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Quote:
One or both of them will need replacing. |
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