P1744 on Ford: How to Diagnose & Fix
Torque Converter Clutch System Performance
3 Ford models · 3 documented issues · 3 critical · $25-$3,500 repair
P1744 on Ford by model: symptoms, diagnosis and fix
The Ford Windstar equipped with the AX4S (1995-2000) and AX4N/4F50N (2001-2003) automatic transmissions suffers from widespread premature transmission failure. CarComplaints.com records 140 complaints for the 2000 model year alone, and 166 problems for the 2003 model year, making transmission failure the single most reported problem for the Windstar. The AX family of transmissions in the Windstar struggles with lubrication problems, harsh 1-2 and 2-1 gear changes, torque converter clutch issues, and catastrophic internal failures. The torque converter clutch solenoid is a particularly weak point, causing shuddering and codes P0741 and P1744. Average repair cost is $2,190 at 102,200 miles according to CarComplaints.com data. Many owners report needing a complete transmission replacement or rebuild, with costs ranging from $1,750 to $3,100.
Common Symptoms
- Harsh or jerky 1-2 and 2-1 gear shifts
- Transmission slipping or shuddering during acceleration
- Torque converter shudder at 40-55 mph
- Check engine light with transmission codes
- Delayed engagement when shifting from Park to Drive
- Transmission overheating warning
- Complete loss of forward gears
- Grinding or whining noise from transmission
How to Fix
For TCC shudder only (codes P0741/P1744), start with transmission fluid change and TCC solenoid replacement ($400-800). For complete transmission failure, remanufactured transmission replacement is the most common solution ($1,750-2,500 installed). Jasper and Ford Motorcraft remanufactured units are the most commonly recommended. Rebuild is an option at $2,000-3,100 but ensure the torque converter is also replaced. Preventive: change transmission fluid every 30,000 miles - the Windstar transmission runs hot and degrades fluid rapidly.
Sources for this issue (1)
The Ford A4LD 4-speed automatic transmission used in early Aerostars (and the 4R44E/4R55E in later models) is known as one of Ford's weakest automatic transmissions. The overdrive band and servo fail prematurely, causing loss of overdrive. The forward clutch pack also wears rapidly, causing no-drive conditions. The valve body develops wear in the separator plate, causing erratic shifting. The transmission was originally designed for the lighter Ranger and is marginal for the heavier Aerostar, especially the AWD version.
Common Symptoms
- No overdrive gear — engine revs high on highway
- Delayed or flared 2-3 upshift
- Transmission slipping under load or on hills
- Harsh engagement when shifting from Park to Drive
- Check engine light with TCC-related codes
How to Fix
A complete transmission rebuild with upgraded friction materials, a wider overdrive band, and a TransGo SK-A4LD shift kit is the recommended fix. The shift kit improves clutch apply pressure and corrects valve body issues. For AWD models, consider upgrading to a remanufactured 4R55E with hardened input shaft. Regular fluid changes every 30,000 miles with Mercon V dramatically extends A4LD life.
Sources for this issue (2)
The 4-speed automatics behind the 4.0L - the early A4LD and the later electronically controlled 4R44E/4R55E - are a known weak point, commonly failing in the 120k-mile range, most often losing 4th gear (overdrive). The overdrive planetary is fragile (early units used a weaker pinion design, later updated to a 6-pinion gear), and a failing vacuum modulator on the A4LD can quietly cook the overdrive section. When the overdrive sprag or drum lets go, debris circulates and a full rebuild is required. A closely related driveline failure is the powdered-metal spacer between the crankshaft and flexplate: Ford's sintered spacer is brittle and cracks, causing a rattle, vibration, and eventually hard-start/no-start or driveline separation.
Common Symptoms
- No 4th gear / no overdrive engagement
- Slipping or flaring shifts
- Delayed or harsh engagement
- Rattle at idle in gear (cracked flexplate spacer)
- Burnt-smelling transmission fluid
- Vibration or hard-start/no-start (spacer failure)
How to Fix
Service the fluid and filter on a strict interval and add an auxiliary cooler if towing. Replace a suspect A4LD vacuum modulator early (inexpensive ~$25 external part). Lost overdrive or slipping generally requires a rebuild or replacement transmission with updated overdrive components. When the transmission or flexplate is out, replace the brittle OEM powdered-metal crank-to-flexplate spacer with a billet-steel upgrade (e.g., Sonnax) to prevent recurrence.
Sources for this issue (1)
P1744 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1744 mean on a Ford?
P1744 stands for "Torque Converter Clutch System Performance." This transmission code means the torque converter clutch (TCC) system is not performing as expected — the lockup clutch inside the torque converter is slipping or not engaging and disengaging properly. The TCC mechanically links the engine to the transmission at cruising speeds to improve efficiency, and the computer monitors slip between engine and transmission speeds to verify it. Excess slip or improper engagement sets this code. You may feel shuddering, RPM that won't settle at cruise, or reduced fuel economy. On Ford it is documented across 3 models: Windstar, Aerostar, Explorer.
What are the most common causes of P1744?
The most common causes of P1744 are: Worn or failing torque converter / lockup clutch, Faulty TCC solenoid, Low or degraded/contaminated transmission fluid, Dirty valve body or stuck valve affecting TCC apply, Damaged TCC solenoid wiring or connector, Internal transmission wear causing excess slip, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P1744 on a Ford?
Published repair estimates on Ford range from $25 to $3,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P1744 on a different make?
View P1744 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.