1991 Ford LT9000
Introduction:
The 1991 Ford LT9000 is a heavy-duty commercial truck, known for its durability and performance. It is powered by a Cummins NTC 350 or Caterpillar 3406E engine, and comes with Allison HT740 or Fuller RT-11509B transmission options. The LT9000 offers a comfortable interior and spacious cabin, making it a popular choice for long-haul transportation and construction work.
Engine
Cummins NTC 350
Head Gasket Failure: Description/Symptoms: Coolant and oil mixing, white smoke from exhaust, overheating Solution: Replace head gasket Estimated Cost to Fix: $1,000 - $2,000+
Intake Valve Failure: Description/Symptoms: Loss of power, rough idling, misfiring Solution: Replace intake valves Estimated Cost to Fix: $500 - $1,000
Oil Pump Failure: Description/Symptoms: Low oil pressure, engine damage Solution: Replace oil pump Estimated Cost to Fix: $200 - $500
Transmission
Allison HT740
Transmission Slippage: Description/Symptoms: Difficulty shifting gears, loss of power Solution: Rebuild or replace transmission Estimated Cost to Fix: $2,000 - $4,000+
Cooler Line Failure: Description/Symptoms: Transmission fluid leaks, overheating Solution: Replace cooler lines Estimated Cost to Fix: $200 - $500
Shifting Issues: Description/Symptoms: Hard shifting, delayed shifts Solution: Adjust or replace shift solenoids Estimated Cost to Fix: $500 - $1,000
Fuller RT-11509B
Clutch Plate Wear: Description/Symptoms: Slipping clutch, difficulty shifting Solution: Replace clutch plate Estimated Cost to Fix: $500 - $1,000
Input Shaft Bearing Failure: Description/Symptoms: Grating noise during shifting, loss of power Solution: Replace input shaft bearing Estimated Cost to Fix: $1,000 - $2,000+
Suspension
Leaf Spring Failure: Description/Symptoms: Sagging rear end, poor handling Solution: Replace leaf springs Estimated Cost to Fix: $500 - $1,000
Airbag Failure: Description/Symptoms: Sagging suspension, reduced ride height Solution: Replace airbags Estimated Cost to Fix: $1,000 - $2,000+
Electrical
Starter Failure: Description/Symptoms: Engine won’t start, clicking sound Solution: Replace starter Estimated Cost to Fix: $200 - $500
Alternator Failure: Description/Symptoms: Battery not charging, electrical system problems Solution: Replace alternator Estimated Cost to Fix: $200 - $500
Wiring Harness Issues: Description/Symptoms: Electrical malfunctions, lights not working Solution: Diagnose and repair wiring harness Estimated Cost to Fix: $200 - $1,000+
Exterior
No Issues Found
Interior
Dashboard Lights Malfunctioning: Description/Symptoms: Gauge cluster or warning lights not working Solution: Replace faulty bulbs or wiring Estimated Cost to Fix: $100 - $500
Seat Adjustment Failure: Description/Symptoms: Seats not adjusting electrically Solution: Repair or replace seat adjustment motors Estimated Cost to Fix: $500 - $1,000
HVAC System Failure: Description/Symptoms: No heat or AC, blower motor not working Solution: Diagnose and repair HVAC components Estimated Cost to Fix: $200 - $1,000+
Summary:
Overall, the 1991 Ford LT9000 is a reliable and robust commercial truck, but it is not immune to certain issues. While some problems, such as head gasket failure and transmission slippage, can be costly to repair, most issues are relatively minor and inexpensive to fix. The truck’s durability and spacious interior make it a popular choice for demanding work applications.