Nissan D21 Pathfinder Pickup Remanufactured Manual Transmission

Description

Eliminate gear pop-out and countershaft bearing growl under severe commercial hauling conditions across rough rural transport routes with the Nissan D21 Remanufactured Manual Transmission engineered for Nissan D21 Hardbody pickup and Pathfinder utility platforms equipped with rear-wheel drive or four-wheel drive configurations.

A high-strength ductile cast iron intermediate plate pairs with a cast aluminum bell housing and case to support case-hardened 8620 steel helical gear sets. Dual-cone brass synchronizers and high-capacity Japanese roller bearings prevent countershaft deflection. The gearbox weighs 88 lbs dry, holds 2.2 quarts of GL-4 gear lubricant, and features a standard 5-bolt tailhousing mount.

Key Features of Nissan D21

Fleet operators choose to buy Nissan D21 remanufactured transmission gearboxes to restore crisp manual shift control and eliminate gearbox noise in demanding commercial work truck service. Every gearbox undergoes complete teardown and precision rebuilding.

• 5-speed manual gear train provides rugged mechanical power transfer for commercial hauling tasks.
• Cast iron center bearing support plates prevent mainshaft gear separation under heavy torque loads.
• High-grade dual-cone synchronizer assemblies restore positive second and third gear shifts without crunch.
• Precision ground gear teeth minimize drivetrain whine during sustained highway freight transit.
• Nissan D21 manual units include new front input shaft quill tubes to ensure smooth clutch release bearing slide.
• High-strength casing seals and front bearing retainer gaskets prevent gear oil leaks under high loads.
• Magnetic fluid drain plugs attract ferrous wear debris to safeguard bronze synchronizer rings.

Torque Handling Capacity Gear Step Ratios

Engineered to handle 180 lb-ft continuous input torque at 4,800 RPM, this manual gearbox handles heavy commercial cargo loads without internal gear tooth damage. Cast aluminum casing walls dissipate gear friction heat to keep lubricant sump temperatures below 180°F. Forward gear steps provide a 3.59:1 first gear, 2.25:1 second gear, 1.41:1 third gear, 1.00:1 fourth gear, and 0.81:1 fifth gear overdrive.

Output Shaft Spline Interface Yoke Dimensions

The transmission output shaft features a 26-spline slip yoke interface machined to tight dimensional tolerances. Companion slip yoke journals maintain under 0.001-inch radial runout to prevent driveline shudder across the rear driveshaft universal joints. Bell housing mounting faces bolt flush against Nissan VG30 or KA24 engine blocks via factory alignment pins.

Bench Verification Procedure Usage Boundaries

Inspect shift linkage bushings and verify clutch pedal free travel before placing vehicles back into commercial service. This manual transmission is not engineered for high-rpm drag racing, vehicle power modifications exceeding 220 horsepower, or vehicles exceeding factory gross combined weight ratings.

• Inspect external manual shift boot rubber and floor pan seals every 15,000 miles.
• Drain and replace manual transmission fluid using SAE 75W-90 GL-4 gear oil every 30,000 miles.
• Check driveshaft slip yoke grease seal and transmission mount bushings every 12 months.

Warranty Statement Heavy Crate Checklist

Covered by a 3-Year / 100,000-Mile commercial fleet warranty covering replacement components and verified labor. The heavy-duty shipping box holds the remanufactured manual transmission, replacement shifter housing gasket, throwout bearing collar, installation instructions, and an inspector certified dyno test report.