Gearbox noise after changing gearbox oil + filter ?!? XJS-V12 auto'83
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Gearbox noise after changing gearbox oil + filter ?!? XJS-V12 auto'83
I'm in shock.... I drove my Jag to mechanic: I wanted new gearbox rear mounting spring + new gearbox oil + filter. Now after the first kilometer a big shock. The gearbox is loud, especially when it is shifted to 1st gear. Previously, he was working almost totaly silent. Now is also new noise from driveshaft, but I understand that it's probably a different position because of the new spring ... But what's wrong with the gearbox ????
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zarnca (03-29-2019)
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The spring for the V12 TH400 transmission is specific for that application, as is the spring for the 6cyl cars with the Borg Warner transmission. They are NOT the same spring at all.
The new spring may be longer than the old spring, due to the old collapsing from age etc, although that is a rare thing.
I still think he knows not what he is doing.
Reassembling that mount CORRECTLY, and aligning that central pin CORRECTLY will be the first thing needed.
Check the trans fluid level, HOT, and engine running at idle. A little OVER full it better than under full in MY opinion.
The new spring may be longer than the old spring, due to the old collapsing from age etc, although that is a rare thing.
I still think he knows not what he is doing.
Reassembling that mount CORRECTLY, and aligning that central pin CORRECTLY will be the first thing needed.
Check the trans fluid level, HOT, and engine running at idle. A little OVER full it better than under full in MY opinion.
The following 2 users liked this post by Grant Francis:
Greg in France (03-29-2019),
orangeblossom (03-29-2019)
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According to my parts listings:
CCC5763 is the LATE XJS, and XJ40, with teh 6ltr engine and a different transmission, as in 4 speed electronic, versus your 3 speed non-electronic.
Same listings have your as:
CAC23271 (old part number), going to CAC6759,as the correct part number.
I seriously doubt they are the same, or Jaguar would have combined ALL teh springs as ONE part number.
Differences, NO IDEA, but in MY opinion, the wrong spring is installed.
CCC5763 is the LATE XJS, and XJ40, with teh 6ltr engine and a different transmission, as in 4 speed electronic, versus your 3 speed non-electronic.
Same listings have your as:
CAC23271 (old part number), going to CAC6759,as the correct part number.
I seriously doubt they are the same, or Jaguar would have combined ALL teh springs as ONE part number.
Differences, NO IDEA, but in MY opinion, the wrong spring is installed.
The following users liked this post:
Greg in France (04-01-2019)
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Widely available from the specialist suppliers. eg
Part search results from David Manners Ltd - CCC6759
Part search results from David Manners Ltd - CCC6759
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Grant Francis (04-01-2019)
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Thank you all for advices, you helped me a lot. I went back to the service. We replaced new spring CCC5763, back with the old one. We put also small shock absorber no. 3. (th400-transmission-mount-explained.doc) - he forgot to install ?!?. Reassemble everything back and now the gearbox works inaudibly, even the vibrations of the driveschaft are gone. The car is excellent again and ready for sale for 7.500eur if someone interested.
The following 2 users liked this post by zarnca:
Grant Francis (04-09-2019),
Greg in France (04-09-2019)
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