Question about 1994 Ford Explorer Limited

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Overdrive lockup trans shifts fine through all gears until overdrive. then its intermittent, after it warms up sometimes it will shift into od, shifts in and out of overdrive. fluid is fresh, new vacumn mod.,

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  • Anonymous Mar 20, 2014

    sometimes it wont shift into overdrive

  • Anonymous Mar 23, 2014

    in and out of gears at 50mph.overdrive ,car yer-ck and drop o.v shift .

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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

  • Matthew Reeves Nov 15, 2012

    Can I take these out with the trans still in the car? I read something yesterday about the O rings being back on one and the pressure was causing the lockup to stay engage.

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Thank you for using fixya and have your Safari scanned for the DTC codes that would indicate what issues your transmission is having to put you in to limp mode.

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