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2005 Explorer 4.0 No drive, No reverse and No line pressure

J. M. Jeffers

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City, State
Oak Hill, WV
Year, Model & Trim Level
2005 Explorer 4.0
Ford Explorer 4.0 Transmission displayed no drive no reverse after start up two months ago. After restarting the engine transmission went into gear and operated perfect. After two months the same thing occurred, but after restarting everything was fine. A couple of days ago same thing, vehicle was parked and after an hour or so restarted and no drive or reverse and restarting didn't fix it this time. I can provide the following:

No codes were present.
Tested all solenoid block resistances at the PCM connector. All within spec.
Tested line pressure at test port just behind shift shaft. ZERO Line Pressure.
Removed solenoid block connector during line pressure test to force line pressure to max. Zero line pressure.
Removed transmission and front pump to inspect line pressure flow control valve. Valve was not stuck open.

I assume the flow control valve could still be the problem. I thought that the slide hammer used to remove the pump may have seated it.
Does anyone have any information on an issue such this?
 
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JK080

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05 F250 6.0
Reading your post I was sure it was the pump flow valve until you said you checked it....

I like the Superior Pump Flow Valve because it uses a ball instead of the valve.

Pump gears? Filter/Filter O rings? Valve Body , Pressure regulator valve.
 

J. M. Jeffers

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Oak Hill, WV
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2005 Explorer 4.0
Reading your post I was sure it was the pump flow valve until you said you checked it....

I like the Superior Pump Flow Valve because it uses a ball instead of the valve.

Pump gears? Filter/Filter O rings? Valve Body , Pressure regulator valve.
Hello, my name is Joe and I was so glad to hear from you. First, thank you for your help. Now, I will provide you with all the info I have.
I rebuilt the trans @ 250,000 miles. Harsh reverse engagement broke the reverse band. During rebuild a Transgo shift kit was installed. It provided a different flow control valve (plunger type) that was installed. Operated perfectly for 80,000 miles, till now. Like you I was sure it was the flow control valve, so after finding it seated, I walked away for a day. The only issue I saw at the pump was one of the two sealing rings on the back of the pump was broken. I figured it occurred during removal. If it were broken I think I would have a different problem. At present, the trans is intact except for the pump and pan.

Based on your experience I ask, Where do I go from here.....

Again, thank you
 

JK080

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05 F250 6.0
Valve Body, Pressure Regulator valve, Filter, anything that would block the fluid to and from the pump.
 
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J. M. Jeffers

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City, State
Oak Hill, WV
Year, Model & Trim Level
2005 Explorer 4.0
Ok.... I will report back
Well it certainly didn’t take long to begin finding answers. I first found a piece of a small diameter brass thrust washer inside the filter housing. Three more in the channel casting above the valve body. As it turns out they are from the front side of the overdrive planet gear set. No other damage found as yet. The reason for no line pressure not yet known, but I suspect stuck valve(s) from contamination.
Any ideas on resourcing a high quality planet. I believe some I have saw came from China.
 

J. M. Jeffers

New Member
Joined
March 13, 2020
Messages
5
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0
City, State
Oak Hill, WV
Year, Model & Trim Level
2005 Explorer 4.0
Well it certainly didn’t take long to begin finding answers. I first found a piece of a small diameter brass thrust washer inside the filter housing. Three more in the channel casting above the valve body. As it turns out they are from the front side of the overdrive planet gear set. No other damage found as yet. The reason for no line pressure not yet known, but I suspect stuck valve(s) from contamination.
Any ideas on resourcing a high quality planet. I believe some I have saw came from China.
Update: Rebuild unit replacing overdrive section. Back in service!!!!
Well it certainly didn’t take long to begin finding answers. I first found a piece of a small diameter brass thrust washer inside the filter housing. Three more in the channel casting above the valve body. As it turns out they are from the front side of the overdrive planet gear set. No other damage found as yet. The reason for no line pressure not yet known, but I suspect stuck valve(s) from contamination.
Any ideas on resourcing a high quality planet. I believe some I have saw came from China.
Update: Rebuilt unit replacing overdrive section. Back in service!!!!
 
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