Turbocharger GTA3776B GTA3782B for International 4300 4400 (2002-2006) 7.6L

Direct-Replacement GTA3776B / GTA3782B Turbocharger for 2002-2006 International 4300, 4400 (DuraStar)

What it Does: The GTA3776B / GTA3782B turbocharger replaces failing factory turbo units on 2002-2006 International 4300 and 4400 trucks to restore manifold boost pressure, throttle transient response, and heavy-duty towing capacity.

The Stock International 4300, 4400 Turbocharger Failure Points

Under continuous duty cycles and thermal fatigue, the factory turbocharger on the DT466 / DT466E platform suffers journal bearing wear, dynamic oil seal degradation, and excessive shaft play. Over time, high exhaust gas temperatures cause thrust bearing friction and carbon coking in the oil passages. This wear triggers oil blow-by past the piston ring seals into the turbine and compressor housings, producing heavy black exhaust smoke, low manifold boost pressure, elevated exhaust gas temperatures (EGTs), and critical loss of pulling torque under load.

The Engineering Solution

Engineered to exact OEM tolerances, this turbo assembly features a heat-resilient K418 alloy turbine wheel engineered to survive extreme thermal loads without blade creep or cracking. Paired with a precision-balanced 6+6 blade cast aluminum compressor wheel (59.2 mm inducer / 82.04 mm exducer) in a 52 trim profile, it delivers steady mass airflow across the mid-range power band. The unit matches the factory oil-cooled center housing and standard Navistar exhaust flange specifications, facilitating a leak-free direct bolt-on installation that recovers rated boost efficiency.

What's Included

• 1 Turbocharger (GTA3776B / GTA3782B specification)
• 1 Turbine Inlet Flange Gasket
• 2 Oil Line Gaskets

Technical Specifications

Compatibility

• 2002-2006 International 4300 DuraStar (DT466 / DT466E 7.6L Diesel)
• 2002-2006 International 4400 DuraStar (DT466 / DT466E 7.6L Diesel)
• Navistar DT466, DT466E, DT466P, DT408P, I530E commercial applications (verify OE part number)

Frequently Asked Questions & Fitment Warnings

Does this fit the DuraStar 4300, 4400?

Yes, this is a direct fit for the 2002-2006 International 4300, 4400 equipped with the DT466 / DT466E engine; always verify your turbo nameplate matches OEM reference 1826344C93 or related part numbers.

What pre-installation steps are required prior to initial startup?

You must replace engine oil and filters, clean or replace supply and drain lines, and pre-lube the turbo oil inlet port to prevent dry-bearing damage upon initial start.

The International Standard

Designed for commercial vocational duty, this replacement turbocharger restores full payload pulling power, lower operating temperatures, and daily towing dependability for commercial fleet operations.