Ford A4LD Transmissions: Specs

In This Guide


Vehicle Compatibility – Makes & Models

  • 1985–1990 Ford Bronco II
  • 1987–1993 Ford Mustang (when equipped with the 2.3 I4)
  • 1987–1988 Ford Thunderbird (when equipped with the 2.3 I4)
  • 1985–1994 Ford Ranger
  • 1986–1994 Ford Aerostar
  • 1991–1994 Ford Explorer
  • 1991–1994 Mazda Navajo

A4LD Transmission Overview

The A4LD was a modification of the C3. It has four speeds, achieved primarily by adding an overdrive gear. The C3 did not have this gear. The A4LD first saw use in North America in the Ford Bronco II and the Ford Ranger, both of which were developed in 1985. Meanwhile, the European market got the Ford Scorpio. All of these models used four-cylinder and six-cylinder engines. However, the A4LD, in turn, gave way to the 4R44E and 4R55E.

The A4LD pioneered electronic controls for torque converter lockup. Specifically, the 3-4 shift was controlled by an electrical solenoid. Meanwhile, the other gears maintained a hydraulic control system. The 3-4 gear shift is the most common one used while driving at traffic and highway speeds.

Because of its status as a pioneer in electronic transmission control, it could be expected to have problems. Specifically, the two solenoids that controlled the torque converter lockup and the other one attached to the 3-4 shifter tended to fail often.

The solenoids failed due to Ford’s inexperience in creating electronic components for the transmission. Heat overworked the metal wire that was used to create the magnetic assembly.

After the wire broke down from excess heat, there was no way to power the electromagnet and use the controls. It could also create a short circuit, which had the same effect. Either the torque converter would no longer lock up, or the vehicle would no longer be able to shift into fourth gear.

Common Problems with the A4LD Transmission

The A4LD has a long history of problems and failures in its years of service. Drivers who still own a vehicle with this transmission should watch out for the following problems:

First, a lack of overdrive. Often, this happens because the overdrive sprag locks up and doesn’t provide any give to the forward clutch spring pack. Shifting into overdrive rips the spring pack completely free, and the only way to fix it is to completely disassemble the transmission and replace the broken part.

Second, the transmission might keep slipping. This happens most often in the A4LD when the kick down cable loses its adjustment. In turn, this makes the transmission slip and destroy clutches. The transmission has to be fully disassembled before any repairs can be made.

Third, you might lack third gear or lack the ability to do a proper 1-2 shift. When this happens, the modulator is defective. If you are doing repairs at any point and notice fluid coming out of the modulator vacuum line, it’s an indicator that the modular has failed or is about to fail. Luckily, it’s an easy and cheap fix.

Finally, there could be fluid leakage at the front. Over time, the front seal can harden or simply wear out. When this happens, it doesn’t hold its shape and cannot stop fluid from leaking out. Transmission fluid provides cooling and lubrication. It could also be the front pump bushing. This isn’t a quick fix; to get to either the front seal or the front pump bushing, the transmission has to come off the vehicle.

If you still have an A4LD transmission and don’t yet want to replace it, you can extend its working lifespan using a few simple methods and modifications.

Place an aftermarket transmission cooler in the return line in addition to the factory cooler. It can help keep the transmission cool because too much heat buildup will destroy it. You should keep the temperature of the transmission below 200 degrees Fahrenheit maximum.

Prevent debris from getting into the cooler by installing an extra inline fluid filter on the line going toward the radiator. By keeping debris out, you increase the life of the cooler because it has to do less work and fluid can flow more freely.

Add a Sonnax valve body kit. This kit includes both a sleeve and a valve, both of which add pressure inside the valve assembly. When pressure increases, it keeps the clutch packs from separating, as well as keeping the clutches and associated bands from overheating.

Change your transmission pan from a steel one to an aluminum one. Also, make it deeper, provided your vehicle has enough ground clearance. The reason for the extra size is to hold more fluid. Also, steel does not dissipate heat as well as does aluminum. Therefore, you run less risk of overheating.

Use an aftermarket shift kit. By making this adjustment, you can increase the transmission line pressure, decreasing the time it takes for the clutches and bands to do their work.

Keep an eye on transmission fluid levels and status. Dark fluid or leaking fluid indicates a problem. You should probably change the fluid every 20,000 miles. If you have any doubts, take your vehicle to a mechanic and have him run a check.

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patrick heddinger
2 months ago

92 explorer a4ld transmission what wires go were to 3@4 solenoid and converter

patrick heddinger
2 months ago

There are 4 wires going to the 3@4 solenoid and converter solenoid. Witch one goes were

Robert Pentz
7 months ago

Rebuilt trans. Now it has no power in reverse

Mark Clark
8 months ago

I need to know what way the od sprag locks

Mark Clark
8 months ago

Which way does the od sprag lock

Eric Hoppe
8 months ago

I have a 1994 Ford Aerostar XL 3.0 I tried
To replace the Neutral Safety Switch, it’s on the side mount right by the linkage
Unhooked the plug wiring, using wrench
Removed the switch (looks like a spark plug) got new one just screw back in, easy
Peasy? Nope! Cannot get it to screw back in
Just keeps turning, even tried to put the old one back nope.

Eric Hoppe
7 months ago
Reply to  Eric Hoppe

I fixed it
Got it to go back in
Works great again

3 months ago
Reply to  Eric Hoppe


11 months ago

My A4LD quit shifting into overdrive works fine it’s just like it’s a 3 speed doesn’t try to go in or slip.
It’s all mechanical 87 Ranger

1 year ago

Transmission has to have high RPMs to engage 4000 to 5000 any lower motor stalls (acts like stuck in high gear)

randall waters
1 year ago

Hello. I am considering 4wd or AWD for my A4LD ’92 ranger. it’s powered by a 2.3 sohc turbo from a merkur xr4ti. I believe the engine (160hp or so) has enough torque & hp to move the xtra wt. of xfer case and frt.axle, incl. frt. drive shaft & 2 axle shafts. Will I be able to use my existing a4ld w/ a 4wd or awd adaptor? I have seen some small xfer cases as used in early escapes etc. Can you please offer any advice on the main 3 concerns? Thank You.

1 year ago

Thanks for this page and the accompanying video. 94 Explorer trans won’t shift into 3rd/4th gears at about 30 mph. The vehicle is not worth it, but I’d like to repair for sentimental reasons and this helped me understand what I might be getting into.

Dave Mix
2 years ago

I have the a4ld in a 1987 aerostar. Borg Warner 1350 was custom installed with Dana 30 front axel. 26,000 on $4400 rebuilt engine. We are into this vehicle for a total of $12000.many problems over the years. It has been parked for over 18 years.Tranny paused going into we Parked it. Now leaking from front seal.tranny has been pulled out a total of 5 times. For repairs. Hesitant to put more money into it or take it to scrap yard. It has 116,000 miles total

2 years ago

Is this Trans compatible with the 3.0 and the 4.0?

2 years ago
Reply to  Zach


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