robbo770 Posted June 27, 2022 Share Posted June 27, 2022 Hi folks, looking for best advice my forester has had a hard life and been off the road for over a year till yesterday when it passed its MOT. I have notice that on turning I am experiencing wheel wind up which I think is a sticky centre diff, possibly as it’s Sat so long. my question is 1 what is best oil to flush out the manual gearbox? And then refill it? 2 what is the centre diff unit like to change on the car and what sort of cost for a new one? 3 would I be able to put in a better gearbox and rear diff matching but keep rest of my drive train without wiring issues etc for the car any help would be great 👍 Quote Link to comment Share on other sites More sharing options...
Mr B Posted June 27, 2022 Share Posted June 27, 2022 The centre diff is a viscous coupling sealed unit and flushing gearbox oil will make no difference to it . new units for a 6 speed be around the £400 mark, the 6 speed is slightly harder replacement than a 5 speed box . I would drive it around a bit and see if stays constant issue, do check all tyres are close match in wear and same model tyre, one of worst things you can do on these AWD viscous diff systems is run miss matched and off brand junky tyres ... Quote Link to comment Share on other sites More sharing options...
robbo770 Posted June 28, 2022 Author Share Posted June 28, 2022 Hi, got any diagrams of the 2009- forester gearbox 6 speed? all new tyres so all exactly the same for rolling size issue cheers Quote Link to comment Share on other sites More sharing options...
Mr B Posted June 28, 2022 Share Posted June 28, 2022 http://jdmfsm.info/Auto/Japan/Subaru/Forester/2009/Forester 2009/ Quote Link to comment Share on other sites More sharing options...
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