A/T - A4LD No 4th Gear: Overview

TECHNICAL BULLETIN # 127

DATE: Aug. 1992

TRANSMISSION: A4LD

SUBJECT: Late Or No Fourth Gear

APPLICATION: Ford

No 4th Gear

There are several conditions which may create no 4th gear. Use the following step by step procedure to isolate the problem.


STEP 1 MECHANICAL TEST:

Drive the vehicle on a lift at a speed which should make the transmission shift to 4th (at least 45 mph). Loosen the overdrive band lock-nut and try to turn the band adjustment bolt.

The band adjustment bolt won't turn:

The overdrive band is applied. You have a mechanical problem. e.g., broken O.D. planet, stripped sun gear splines etc.

The band adjustment bolt turns easily:

The overdrive band is not applied. Tighten the overdrive band, this should cause the drive wheels to increase in speed. This will confirm that mechanically, the overdrive section of the transmission works.

Note
The following steps vary depending on whether the transmission has one or two solenoids.

If the transmission has one solenoid, proceed with step 2.
If the transmission has two solenoids, go to step 6.

Note
Single solenoid units will have two wires at the case connector. Two solenoid units will have three wires.