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Message: <blockquote data-quote="rpmnut" data-source="post: 22182" data-attributes="member: 20757"><p>Hey guys,I've been getting mixed signals from BMW "specialists" out there. Been thinking of servicing the valve body on my E39 gearbox (ZF5HP19). I've done a gearbox reset and a software update as well as changing the gearbox mountings, but after a week of smooth running, the gearbox is back to having a slightly jerky 3rd to 2nd downshift. No other gears are affected. Upshifts through the gears are silky smooth. Downshifts from 5-4-3 is also smooth, but when it shifts from 3-2 at slow speeds on level ground, there's a noticeable jerk from the driveline. Weirdly enough, if I slow down on a decline or incline, there's no jerk.I consulted AB (a friend works in the service dept) who did an OBD check and found no error codes. But he said that I might need to service the valve body on the ZF as he suspects there's a sticking solenoid. Apparently this would't show as an error code on the E39's diagnostics. So replacement of the affected solenoid should solve the problem.Then when I sent the car to Ah Wai for a routine bulb replacement and asked him about what AB had told me, he said servicing the valve body can be done, but it normally doesn't do much as once the g/b starts acting up it's a sign it's time for replacement.So my question to all the ZF sifus out there.....should I spend 1k+ to service and replace the solenoids or do you reckon I really need a new gearbox? Many thanks in advance for your input:wink:</p></blockquote><p></p>

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