auto gearbox problems

[UK Rob]

Hi, coming from the Uk where no one knows about exploreres could you help?
My Explorer is just turning 38000 miles and I have just noticed that when I lock the gearbox into first when going down hill the revs drop and I just over run as if I were in drive and taken my foot off, ie no engine braking. This only happens after about five mins of starting up, before that everything works as it should.

Could this be caused by the UK's extended oil changes Engine 10K Gearbox 40K?. Or is there a problem in the box that an oil change would not help?. Dealers over here dont wont to help out as the staff have only seen a handfull of Explorers and not many problems

Please Help

 

[Robert]

It's always good to try and search first before posting a question. It helps to save repeating things that have been asked dozens of times before. Here is what you are looking for:

Dead Link Removed

 

[dogfriend]

This sounds like it could be a solenoid problem or PCM (powertrain control module) issue. The 5R55E uses solenoids to control hydraulic pressure applied to the clutch bands and the PCM directs the opening and closing of the solenoids based on the sensor inputs, both by the transmission and the engine control system.

Does it make any difference whether the OD switch (on the shift lever) is on or off? I recall that this will change the engine braking behavior in certain ranges, but I can't recall all of the details without looking at the manual again.

edit: I looked at the manual. One of the symptoms listed for SS4 (shift solenoid 4) is the loss of engine braking. SS4 controls engagement of the coast clutch. If this is true, it would also be likely to set one or more DTC(s) (diagnostic trouble code(s)). They could scan for this at the dealership.