Garrett GTP38R Turbo Kit for Power Stroke: Specs, Fitment, and Power Gains

The Garrett GTP38R turbocharger kit for the Ford 7.3L Power Stroke is the performance upgrade for one of the most enduring diesel truck platforms ever produced. The 7.3L Power Stroke diesel in the 1999.5-2003 Ford Super Duty and Excursion came factory-equipped with the Garrett TP38 turbocharger -- a reliable fixed-geometry unit with a wastegate that performed well in the factory configuration but whose compressor map leaves headroom untapped by the time these trucks reach a Stage 1 tune or need turbocharger service after years of boost cycles. The GTP38R is Garrett's upgraded variant of the TP38 platform, featuring an updated compressor section that improves flow efficiency and surge margin compared to the factory unit. For a 7.3L Power Stroke owner replacing a worn factory turbo or adding a performance upgrade alongside an ECU tune, the Garrett GTP38R is the direct-fit replacement that delivers both fresh reliability and measurable performance improvement over the original. This guide covers the GTP38R specifications, fitment details for the 1999.5-2003 Power Stroke platform, and how this Garrett turbocharger compares to the factory unit.

Fitment: Garrett GTP38R for 1999.5-2003 Ford 7.3L Power Stroke

The Garrett GTP38R Turbocharger Kit (739619-5004S, with CHRA 739625-0001) fits:

• 1999.5-2003 Ford F-250 Super Duty with 7.3L Power Stroke diesel
• 1999.5-2003 Ford F-350 Super Duty with 7.3L Power Stroke diesel
• 1999.5-2003 Ford F-450 Super Duty with 7.3L Power Stroke diesel
• 1999.5-2003 Ford Excursion with 7.3L Power Stroke diesel

The GTP38R installs at the factory turbocharger location on the 7.3L Power Stroke using the factory exhaust manifold mounting, oil feed and drain ports, coolant connections, and compressor outlet to intercooler connection. The wastegate actuator connection is retained; the 7.3L Power Stroke uses a pneumatically controlled wastegate rather than electronic variable-geometry vanes, and the factory wastegate system continues to operate with the GTP38R installed. No modifications to the factory intercooler piping, exhaust, or boost control system are required for a base installation.

The 7.3L Power Stroke turbocharger fits in a relatively accessible location compared to later Power Stroke generations. The intercooler piping, oil drain line, and wastegate actuator line are the main service connections alongside the exhaust manifold mounting hardware. Oil drain line condition is an important inspection point during turbo service on high-mileage 7.3L Power Strokes -- a partially restricted drain line will cause oil to accumulate at the turbo center section and push past the compressor seal regardless of the turbo's condition, so confirming a clear oil drain path before installing a fresh turbocharger is a standard best practice on this platform.

Top Picks: Garrett GTP38R and Supporting Parts for the 7.3L Power Stroke

The Garrett GTP38R Turbo Kit - Ford Power Stroke 7.3L 1999.5-2003 CHRA 739625-0001 Turbocharger (739619-5004S) is the direct-fit GTP38R upgrade for the 7.3L Power Stroke platform. The kit includes the GTP38R turbocharger assembly with the updated CHRA (Center Housing Rotating Assembly) 739625-0001, which uses Garrett's current-specification compressor wheel and bearing design in the TP38 housing footprint. The compressor upgrade in the GTP38R improves flow efficiency and pushes the surge line outward compared to the factory TP38, which means the GTP38R sustains stable boost at the elevated boost targets a Stage 1 or Stage 2 tune commands without the surge the worn or stock-specification factory compressor produces at those conditions. For the 2000-2003 7.3L Power Stroke, the wastegate actuator is a separate wear item that commonly requires service at the same time as the turbocharger; the 7.3L Power Stroke Turbo Actuator 2000-2003 - Garrett is the factory-spec actuator replacement for this platform. Browse the complete Garrett Power Stroke turbocharger catalog for GTP38R kits and supporting turbo components for the 7.3L Power Stroke and other Ford diesel applications.

Match to the Build

• 1999.5-2003 7.3L Power Stroke replacing a worn factory turbo: The factory TP38 on a high-mileage 7.3L Power Stroke is among the most common Power Stroke service items; the GTP38R is the correct Garrett performance replacement that restores full boost output and improves surge margin and compressor efficiency beyond the factory unit's original specification in new condition
• 7.3L Power Stroke at Stage 1 tune with chip or programmer: The most popular performance upgrade on the 7.3L Power Stroke platform is a performance programmer or chip that raises fueling and boost targets above the factory calibration; the GTP38R's improved compressor map delivers stable boost at Stage 1 boost levels where the factory TP38 -- especially a worn unit -- would surge; pairing a fresh GTP38R with a Stage 1 tune is the most common performance upgrade combination on this platform
• 7.3L Power Stroke tow truck that needs reliable boost under sustained load: Towing heavy loads with a 7.3L Power Stroke keeps the turbo spooled and the boost demand sustained for extended periods; the GTP38R provides consistent boost delivery at sustained tow loads with better compressor efficiency than a degraded factory unit, which reduces EGTs at a given tow load and keeps the engine in a safer operating range
• 7.3L Power Stroke showing actuator-related boost issues on the 2000-2003 application: The turbocharger and wastegate actuator on the 7.3L Power Stroke are related service items; an actuator that is not holding correct boost setpoints creates boost instability that mimics turbocharger wear; replacing both the GTP38R and the actuator at the same service interval confirms the boost system is fresh throughout

Signs the 7.3L Power Stroke Turbocharger Is Due for Replacement

• Blue or black smoke from the exhaust at idle or on startup -- oil making it past the compressor shaft seal produces blue smoke from the intake side; the 7.3L Power Stroke's high-flow HEUI fuel system tends to produce black smoke under rich conditions, but persistent blue-tinted smoke at idle specifically points to turbo seal wear; confirming oil residue inside the compressor inlet hose confirms the compressor seal as the source
• Compressor surge sound under acceleration -- a rhythmic flutter or chuff from the intake during boost buildup indicates the compressor operating past its surge line; on a factory TP38, this typically occurs at Stage 1 tune boost levels where the factory compressor map does not have sufficient surge margin; the GTP38R's improved compressor eliminates this condition at Stage 1 operating points
• Boost pressure lower than commanded by the tune or lower than the truck previously produced -- a drop in peak boost on a 7.3L Power Stroke that was previously producing normal boost levels; can indicate compressor efficiency loss from accumulated wear, turbine housing wear, or shaft play allowing the turbine wheel to contact the housing; replacing the turbocharger with a fresh GTP38R restores the commanded boost setpoint
• Shaft play or bearing noise audible at the turbocharger -- the 7.3L Power Stroke TP38 turbocharger bearing assembly has a defined service life; radial shaft play beyond factory specification allows the compressor and turbine wheels to contact their respective housings, which produces audible grinding or contact noise and accelerates damage; replacing before complete bearing failure avoids debris ingestion into the engine

Frequently Asked Questions

What is the difference between the TP38 and the GTP38R?

The TP38 is the factory Garrett turbocharger specification used in the 7.3L Power Stroke. The GTP38R is Garrett's updated variant of the same platform with an improved compressor wheel and bearing assembly. The GTP38R uses the same housing footprint and mounting dimensions as the factory TP38 for direct-fit installation, but the compressor section delivers better efficiency and a wider surge margin at elevated boost targets. The practical difference shows up on tuned 7.3L Power Strokes: at Stage 1 boost levels, the GTP38R sustains stable boost where the factory TP38 -- particularly a worn one -- begins to surge. At stock boost levels, the GTP38R runs with better compressor efficiency and lower charge air temperatures than an equivalent-mileage factory unit.

Bottom Line

The Garrett GTP38R turbocharger kit (739619-5004S) is the performance replacement for the factory TP38 on the 1999.5-2003 Ford 7.3L Power Stroke. It installs at the factory location with no modifications, improves compressor efficiency and surge margin over the factory unit, and is the correct turbocharger for Stage 1 tuned 7.3L Power Stroke builds. Replace the wastegate actuator at the same service interval on 2000-2003 applications to bring the complete boost control system to fresh specification together.