Originally Posted by X5only (Post 1248874)

I would do a full service. I serviced the transmission of my 2005 4.4 last year May at around 170k miles with absolutely no issues. It continues to shift like new. Note that I changed much more than just the fluid and filter- the solenoids, seals, mechatronic separator plate, trans damper pistons were changed, and a thorough cleaning was done. You can get away without changing the trans damper and the plate, but I did them any way since I was already there and the parts are not expensive. The 4 drain/refill/drive cycles I did really cleaned up the transmission. When I finally opened it up it was really clean. I think just changing the fluid and filter for the first time on a high mileage trans may not be a good idea.

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Originally Posted by amebb (Post 1248878)

I think you are correct. Considering that my car has high milleage it would make sense to change the trans oil, filter and then the seals too. ...

Originally Posted by Clavurion (Post 1248881)

As the position switch is a hall sensor the sliding surfaces are magnetic and just the debris over the years can disable it. So just removing and cleaning it might cure it. But of course when the mechatronics is on the table you should check the components and be prepared to renew things if needed. Easier done if you have a possibility to have the vehicle standing for a while.

Originally Posted by EODguy (Post 1248884)

[emoji106]

Yes! There is a at least a 50% chance cleaning will allow the position switch to work again.

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Originally Posted by amebb (Post 1248896)

Yes, i think the common sense approach would be to start with a good examiniation of the part, clean it and if it needs to be replaced, then i will replace it.

Originally Posted by X5only (Post 1248900)

Yep, clean it but not sure how to test it while the trans is open. This is what mine looked like although there were no issues. You don't want to open the transmission again if it still doesn't work.