The 1987 Ford F800 with 429 engine and manual transmission is a heavy-duty work truck featuring a 7.0L V8 gasoline engine, 5-speed manual transmission, dual rear wheels, hydraulic brakes, and GVWR up to 26,000 lbs. This manual covers operation, maintenance, and troubleshooting for the transmission system. Below are key sections for specifications, operation, maintenance, troubleshooting, and service procedures.
Key components: 5-speed manual transmission, synchronizers, clutch assembly, shift linkage.
| Feature | Description |
|---|---|
| Transmission Type | 5-speed manual with overdrive |
| Gear Ratios | 1st: 6.38, 2nd: 3.58, 3rd: 1.71, 4th: 1.00, 5th: 0.78, Reverse: 6.69 |
| Clutch Type | 14-inch single plate dry clutch |
| Fluid Capacity | 6.5 quarts (80W-90 gear oil) |
| Shift Pattern | H-pattern with reverse left and forward |
| Transmission Model | Clark 285V |
| Input Shaft | 1.375-inch 10-spline |
| Output Shaft | 1.750-inch 10-spline |
| Weight | Approximately 285 lbs |
| PTO Provision | Right side PTO opening |
Proper shifting techniques for optimal transmission performance.
WARNING! Do not rest hand on shift lever while driving. Avoid gear grinding by fully depressing clutch.
Regular maintenance ensures long transmission life.
CAUTION! Use only specified lubricants. Overfilling can cause seal damage.
14-inch single plate dry clutch with hydraulic actuation.
Components: Clutch disc, pressure plate, throwout bearing, clutch master cylinder, slave cylinder.
Adjustment: Check clutch pedal free play (1-1.5 inches). Bleed hydraulic system if spongy pedal. Replacement: Inspect clutch disc for wear (minimum thickness 0.300 inches). Resurface flywheel during clutch replacement. Pilot bearing: Lubricate with high-temperature grease during assembly.
Standard H-pattern with reverse lockout.
Tip: Double-clutch when downshifting to extend synchronizer life.
Typical transmission problems and identification.
WARNING! Address transmission noises immediately to prevent major damage.
Procedure for transmission removal and installation.
CAUTION! Transmission weighs 285 lbs - use proper lifting equipment.
Always use wheel chocks when working under vehicle. Support vehicle with jack stands - never rely on jack alone.
CAUTION! Transmission fluid may be hot after operation. Wear safety glasses when working underneath.
Original warranty: 12 months/12,000 miles from date of purchase. Coverage includes defects in materials and workmanship. Does not cover damage from misuse, improper maintenance, or accidents. For warranty claims, contact Ford Motor Company at 1-800-392-3673 or visit authorized Ford heavy truck dealer with original purchase documents.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Hard to shift | Low fluid, worn synchronizers | Check fluid level, inspect synchronizers, adjust clutch |
| Gear grinding | Clutch not disengaging | Bleed hydraulic system, check master cylinder |
| Jumping out of gear | Worn detent springs | Replace detent springs and balls, check shift forks |
| Transmission noise | Low fluid, bearing wear | Check fluid level, inspect bearings for wear |
| Fluid leaks | Worn seals/gaskets | Replace input/output shaft seals, check case gasket |
| Clutch slippage | Worn clutch disc | Adjust free play, replace clutch components |
| Vibration | Bad mounts/U-joints | Inspect transmission mounts, check U-joints for wear |
| No drive in any gear | Input shaft broken | Remove transmission, inspect input shaft and gears |
Service: 1-800-392-3673; www.ford.com/trucks