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Hi Shy Guy, The oil to use in a 4 X 4 differential should be a good quality EP 90, (Extreme Pressure), either synthetic or mineral. The same can be used in the gearbox, but you may find a slight beneficial fuel saving by using 70 w 85 gear oil in the gearbox. Regards John
Probably the oil filter is blocked.
Warm it all up with a 30-45 minute drive & then change the oil in the gearbox whilst it's still hot. Make sure you also change or thoroughly clean the gearbox oil filter at the same time.
After that you're looking at the tension bands & the dog-clutches, which are a specialist mechanics job.
1 low gearbox fluid or the system needs to be bled through.
2 the slave cylider for the auto gears has gone wrong and may need replacing although the year of the car this would be unusual.
3 the torque converter in the gearbox might have gone, all 3 of these would cause this issue.
Go for the cheaper ones first check the fluid, and ensure there is no air in the system.
Hope this helps. auto box's are a funny thing and it would have to be one of these 3 things unless the gearbox has gone, but again thats not very likely on a 2009 car.
It could be the thickness/condition of the fluid and if its been changed recently is it the correct fluid,as Mitsubishis are known to be fussy about the fluid they run,check the color ,it needs to be a reddish pink,if its brownish it needs to be cheanged/flushed.Of course check the level carefully,this should help sort the issue!
It's a pretty hard one as it's a 4X4 gearbox with the transfer case as well. For your own safety, I would suggest you get a workshop doing it. Try to source out your own parts, shop around if you are on a budget. It's very heavy and if you are not used to that it might be not worth.
Cheers and hope you make the right decision.
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