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Ford 2002 Expedition Overdrive problem, bypass switch fuse 5 amp #29 blows when I reach the speed when the trans should change, OD switch was depressed and lamp lite till this event. Could this be a relay problem or trans problem? note OD lamp stays on when switch is pushed once when parked with good fuse.

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6ya6ya
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Posted on Jan 02, 2017

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  • 239 Answers

SOURCE: 99 f250 SD 7.3

Your speed sensor in your trans. needs to be checked out sounds like its not working or not getting a good signal until its generating enough power and speed to start until it reaches 30 MPH. Check that out sometimes it could just be some dirt on it. It all makes sense the ABS light is on because its not reading the speed of the tires, and the AOD light is on because It has no idea when to shift into overdrive without knowing how fast its going. I sure Hope that Helps You Out, And Thanks, Bear001

Posted on Jun 17, 2008

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SOURCE: overdrive lockup

On the passenger side of the trans there are two servos.A servo is a steel piston with rubber lip seals bonded to the steel.The servo piston strokes in or out,applying or releasing a band.There are two servos,each hidden behind circular aluminum covers held into the case with snap rings.The rear servo actuates the 2nd gear band,and the front servo actuates the 4th gear,or O.D. band.The rubber lip seals on the servo pistons are soft and pliable when new,but with hot and cold cycles,and years of use,the rubber hardens and doesnt seal very well,causing loss of gears.It is very possible the servo has hardened,and that's why you are losing 4th.The other possible cause is electronic.This trans,the A4LD has 2 electrical solenoids inside the trans,4th gear solenoid and lockup solenoid.These are the ONLY electronics inside the trans,another possible problem area.I would remove the servos first for inspection,but before removal,take a scribe and scratch into the aluminum covers,"F" on the front one,and "R" on the rear one.These servos are different diameters,and MUST go back where they came out of.On the servo covers you will see cast into the covers 2 letters identifying the servo it requires....AB.....BB.....ZC...etc.These are examples,and yours will likely be AB and BB.If you DIY....use plenty of vaseline on the rubber lip seals,and the servo bores, to prevent cutting the new servo seals and O rings.Good luck.

Posted on Sep 09, 2008

  • 1 Answer

SOURCE: 1998 ford expedition blinking overdrive light

This blinking light indicates a problem. You will have to have it scanned for trouble codes to find out
what it is.

Posted on Mar 29, 2009

  • 540 Answers

SOURCE: 2000 LUMINA 3.1 W/4T60E OVERDRIVE WON'T RELEASE ON

you can disconnect the main connector on drivers side top of trans it might help, but really needs to be diagnosed, and repaired, probably a faulty tcc solenoid..

Posted on Nov 29, 2009

  • 170 Answers

SOURCE: I have a 1985 toyota pickup auto trans w/od 4

OVERDRIVE BAND IS BROKE OR TRANNY FILTER IS CLOGGED PULL PAN IF ANY PCS OF BAND ARE PRESENT YOU NEED A REBUILD

Posted on Jun 27, 2010

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