Hi Swedespeed,<br>I was wondering if anyone could offer some advice on overhauling overdrive transmissions?<br>I have a M410 that has sat dormant for the past (oh my god) 15 years. Should I give this transmission a birthday and overhaul with new gaskets, o-rings etc? I see there are J-type kits listed regularly on e-bay. Would this kit fit the M410 or are they for a smaller version J-type M41? I am apprehensive in pulling this down as I have read that they are tricky and you need a press to do some parts of the work as there are high pressure springs inside?<br>Are there any risks in just giving it a run after changing oil and doing a solenoid check?<br>Thanks, James.