4R475E
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7th Gear
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4R475E
Just rebuilt trans on my 06 xlt 4r75e did the air test cluthes engaged . bought remanufactured valve body with shift solenoides & torque converter all back together test drive was bad speedo said 100 mph, it might been going 20 mph neturaled out did a line preasure test all was good wot was good .did the EPC preasure test idle was all with in ranges,But the WOT test preasures were low D=100 2=120 1=120 & R was 110psi what do the low EPC/WOT mean ???
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
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7th Gear
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# 1 from the line preasure port / tests were all in range ..
#2 from the EPC test port /idle preasures were good ..but at WOT [wide open throttle} they were low. D was @ 100 psi should 170 - 230 psi & low 1 & 2 were120 psi should also be @ 170 - 230 psi . Rev was @ 111 should be 250 - 300 psi .
#2 from the EPC test port /idle preasures were good ..but at WOT [wide open throttle} they were low. D was @ 100 psi should 170 - 230 psi & low 1 & 2 were120 psi should also be @ 170 - 230 psi . Rev was @ 111 should be 250 - 300 psi .
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7th Gear
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
I learned something new today! I am obviously not that familiar with the 4R75E trans.
You are misreading the chart.
The pressure at the EPC test port at WOT should be 95-115 PSI in OD, 2, and 1. Reverse at WOT should be 80-95 PSI. You are quoting line pressures, not EPC pressures. So your EPC is actually a bit high, not low.
I suspect a large internal pressure leak. Can you watch a line pressure gauge while driving to see what line pressure does when it goes to neutral?
D was @ 100 psi should 170 - 230 psi & low 1 & 2 were120 psi should also be @ 170 - 230 psi . Rev was @ 111 should be 250 - 300 psi
The pressure at the EPC test port at WOT should be 95-115 PSI in OD, 2, and 1. Reverse at WOT should be 80-95 PSI. You are quoting line pressures, not EPC pressures. So your EPC is actually a bit high, not low.
I suspect a large internal pressure leak. Can you watch a line pressure gauge while driving to see what line pressure does when it goes to neutral?
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7th Gear
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i will try that and let you know . It will be a couple days thow busy weekend . I suspect a large internal pressure leak . But air tests worked good .
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