The 1987 Dodge W150 features a rugged manual transmission system designed for heavy-duty performance and reliability. This 4x4 pickup truck comes equipped with either a 4-speed or 5-speed manual transmission option, providing excellent torque control and durability for both on-road and off-road applications. Below are key sections covering specifications, operation, maintenance, troubleshooting, and service procedures.
The 1987 Dodge W150 manual transmission is built for durability and heavy-duty performance.
| Specification | Details |
|---|---|
| Transmission Type | Manual 4-speed or 5-speed |
| Model Codes | NP435 (4-speed), NP445 (5-speed) |
| Case Material | Cast iron |
| Gear Type | Helical cut gears (2nd-4th/5th) |
| Synchronizers | 2nd, 3rd, 4th, and 5th gears |
| Input Shaft | 10-spline, 1-1/8" diameter |
| Output Shaft | 23-spline |
| Length | Approximately 24.5 inches |
| Weight | Approximately 125 lbs |
| Compatible Engines | 318ci V8, 360ci V8 |
Understanding the gear ratios and proper shifting technique ensures optimal performance and longevity.
WARNING! Do not rest hand on shift lever while driving; this can cause premature wear on transmission components.
The clutch system provides smooth engagement between engine and transmission.
CAUTION! Proper clutch adjustment is critical; excessive free play can cause incomplete disengagement.
Proper lubrication is essential for transmission longevity and performance.
| Fluid Type | Capacity | Change Interval |
|---|---|---|
| Manual Transmission Fluid | 3.5 quarts | Every 30,000 miles |
| Recommended Grade | SAE 80W-90 GL-4 | Do not use GL-5 |
| Transfer Case Fluid | 2.5 pints | Every 15,000 miles |
| Differential Fluid | 4.0 pints (front), 5.5 pints (rear) | Every 30,000 miles |
NOTE: GL-5 gear oil can damage brass synchronizers; use only GL-4 specification.
Familiarize yourself with the transmission shift pattern for safe operation.
4-Speed Pattern:
5-Speed Pattern:
Regular maintenance ensures long transmission life and reliable performance.
Tip: Keep transmission breather tubes clear to prevent water intrusion.
Address common transmission problems with these diagnostic steps.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Hard shifting | Worn synchronizers, incorrect fluid | Change to proper GL-4 fluid; inspect synchronizers |
| Gear grinding | Clutch not disengaging fully | Adjust clutch linkage; check hydraulic system |
| Transmission jumps out of gear | Worn shift forks or detents | Inspect internal components; replace worn parts |
| Noise in neutral | Worn input shaft bearing | Replace input shaft bearing |
| Noise in gear | Worn countershaft bearings | Replace countershaft bearings |
| Fluid leaks | Worn seals or gaskets | Replace output shaft seal, input shaft seal, or side cover gasket |
Proper procedure for removing and installing the manual transmission.
WARNING! Transmission is heavy; use proper lifting equipment and assistance.
The manual transmission works in conjunction with the NP208 transfer case.
CAUTION! Do not operate in 4WD on dry pavement; this can cause driveline binding and damage.
Original warranty coverage and service recommendations.
Original Warranty: 5 years/50,000 miles (whichever comes first) from original purchase date. Coverage includes defects in materials and workmanship. Normal wear items, abuse, and improper maintenance are not covered.
Service Intervals: Follow maintenance schedule outlined in section 7. Use only Mopar or equivalent quality replacement parts.
Resources for additional assistance and technical information.
Note: This transmission is known for durability; many units exceed 200,000 miles with proper maintenance.