Hi,
first you have to describe whats going on w/ the gearbox? is it shifting hard? slippinig? what gear? does it happen often or once in a while?... with regards to your other question , if you have the spare time there is no harm in opening up the box, it can be done, but it does need some form of specialized equipment if you might call it that. im refering to the volvo diagnostic equip. so you can reset adaptation values for the TCM. in my experience these boxes even when they dont run anymore rarely burn their clutches & band which is what conventional diagnosis and thinking might suggest. as a further suggestion I would recommend doing a pressure reading first and il help you interpret the readings. it gives a significant description of whats wrong inside. yes this box is used for many other makes usually you can interchange the hard parts ie. planets & drums also linings. the only thing to watch out are the solenoids some makes use different configurations ie. normally open & normally closed. Automatic chice in europe is a good source for parts ive got some from them and im half a world away.
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