Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1987BRONCO II 4WD V6-177 2.9LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - A4LD SLIPPING UNDER ACCELERATION
1987 Ford Bronco II 4WD V6-177 2.9L
A/T - A4LD Slipping Under Acceleration
1987 Ford Bronco II 4WD V6-177 2.9LSECTION A/T - A4LD Slipping Under Acceleration
TSB 88-11 (Feb)
SUBJECT: FORD A4LD
PROBLEM:
Passing gear neutrals, or after coastdown before stopping, re-acceleration gives a neutral condition.
POSSIBLE CAUSE: Defective overdrive sprag
POSSIBLE SOLUTION:
The overdrive sprag in the A4LD works the same as many other overdrive transmissions in that it must lock, or hold in 1st, 2nd, and 3rd gears, and must free-wheel in 4th gear.
As long as the selector is in the D4 position, the overdrive sprag will also free-wheel when coasting. Many times "weak" or "borderline" sprag's will fail to lock after the sprag has been free-wheeling and suddenly must lock, under a load such as a 4th to 3rd, or 4th to 2nd forced downshift or re-acceleration after a coastdown. This failure to lock will cause a neutral condition.
SUBJECT: FORD A4LD
PROBLEM:
Passing gear neutrals, or after coastdown before stopping, re-acceleration gives a neutral condition.
POSSIBLE CAUSE: Defective overdrive sprag
POSSIBLE SOLUTION:
The overdrive sprag in the A4LD works the same as many other overdrive transmissions in that it must lock, or hold in 1st, 2nd, and 3rd gears, and must free-wheel in 4th gear.
As long as the selector is in the D4 position, the overdrive sprag will also free-wheel when coasting. Many times "weak" or "borderline" sprag's will fail to lock after the sprag has been free-wheeling and suddenly must lock, under a load such as a 4th to 3rd, or 4th to 2nd forced downshift or re-acceleration after a coastdown. This failure to lock will cause a neutral condition.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.