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vx v6 transmission problem

ryan101

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My partner has a vx v6 auto which has a problem,
The problem ( try explain best way I can) when sitting on a 100km say I get to an incline and the car slows down say to 90km I gently put my foot down to maintain ( get back up to) 100km I get a thump and it will keep thumping unless I put my foot down harder so it changes back a gear! It's like the Trans is confused on what gear it wants to be in! But if I have it in 3rd gear not in drive it won't do it!
 

billythakid

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Sounds like something haywire in the overdrive part . Have you checked there is enough fluid in the box ? It doesn't have to be down very far for them to start slipping . Check it in park on level ground WITH ENGINE IDLING . If its full then when was the fluid and filter last changed in the box
 

ryan101

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Box has been serviced very regularly, even had the solinoids changed! But my mechanic (without looking at it) said it sounds like its missing under load ( it only plays up when we've been driving it for awhile as well) so doesn't do it when cold! It's had the spark plugs changed 15000 km ago but the leads never haven been changed so 180 000km old he said change them first
 
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