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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My Geo Metro 1992 automatic 3.1 does not want to shift from first when cold. After driving a few blocks (in first gear), it shifts normally - down at 20 and into overdrive at 40- and keeps on workin

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I would add one 10 oz bottle of RED LUBGARD
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May just be the cold temp shrinks the valve body,
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Are you sure your fluid level is correct? When they don't shift until warmed up,that is usually dirt or low fluid.
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Sounds like your transmission is in limp mode. This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

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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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Your vehicle should have the A4LD trans.Some of those small Bronco's had C-5....3 speed,lockup trans in them.If yours is indeed the O.Drive trans,4th gear in that trans is totally mechanical and hydraulic control.The only electricals in that year trans is lockup apply inside the torque convertor,and that happens after the 3-4 upshift.Later version DID have a solenoid for 4th gear.4th gear consists of the Forward clutch pack applied,and the front band,or O.D. band.This band is applied with a servo piston.It is a steel core piston with a pin and a rubber bonded covering with molded in lip seals.These servos are known for the rubber hardening,and no longer applying the band.Sometimes the band gets burnt to the point of no good,but installing a new piston is possible without removing the trans.Other than the servo piston,or without checking the valves in the valvebody,pretty much the trans would have to come out and be inspected.Good luck.j

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