Turbocharger GTA3776B GTA3782B for International 4700 4900 (1993-2001) 7.6L 8.7L

Direct-Replacement GTA3776B / GTA3782B Turbocharger for 1993-2001 International 4700,4900 (S-Series / 4000-Series)

What it Does: The GTA3776B / GTA3782B turbocharger restores manifold boost pressure, corrects exhaust smoke, and recovers towing torque on 1993-2001 International 4700 and 4900 commercial chassis.

The Stock International 4700,4900 Journal Bearing and Heat Fatigue Failure

Under continuous commercial duty cycles and heavy GCWR payloads, factory turbochargers on the Navistar DT466 and DT530 suffer from oil carbonization, journal bearing play, and thrust bearing wear. Excessive shaft endplay allows the rotating assembly to contact the housing, causing compressor wheel degradation, pressurized oil blow-by past the dynamic piston ring seals, and severe boost leakage. This manifests as heavy black smoke under acceleration, high exhaust gas temperatures (EGTs), and critical loss of grade-climbing power.

The Engineering Solution

This direct bolt-on unit utilizes a heat-resistant K418 alloy turbine wheel engineered to survive continuous high-thermal loading without blade deflection or micro-cracking. Featuring a 72.72 mm inducer and 64.06 mm 10-blade exducer, paired with a precision-machined 6+6 blade cast aluminum compressor wheel (59.2 mm inducer / 82.04 mm exducer, 52 trim), this turbocharger delivers factory airflow efficiency and transient boost response. The core features heavy-duty bronze hydrodynamic journal bearings and a 360-degree thrust collar assembly fed via standard oil-cooled galleries, matching OEM oil feed and drain port patterns without housing clocking or manifold adapter plates.

What's Included

• 1 Turbocharger
• 1 Turbine Inlet Flange Gasket
• 2 Oil Line Gaskets

Technical Specifications

Compatibility

• 1993-2001 International 4700 Medium Duty Truck (7.6L DT466 / DT466E, 8.7L DT530 / I530E)
• 1993-2001 International 4900 Heavy Duty Truck (7.6L DT466 / DT466E, 8.7L DT530 / I530E)
• Navistar DT408P, DT466P, DT466E, and I530E commercial diesel applications up to 275 HP

Frequently Asked Questions & Fitment Warnings

Does this fit the 4000-Series 4700,4900?

Yes, this is a direct fit for the 1993-2001 International 4700,4900 equipped with the DT466, DT466E, or I530E engine; always verify your current turbo tag against listed OEM part numbers to confirm precise housing match.

What pre-installation steps are critical to prevent immediate turbo failure?

Flush or replace the oil feed line, change engine oil and filter, inspect the charge air piping for debris, and manually pre-lube the center housing with clean oil prior to initial crank.

The International Commercial Fleet Standard

Engineered to handle severe GCWR medium-duty hauling, municipal routes, and sustained highway operation, this turbocharger restores the payload torque and operational reliability fleet operators demand.