SPOOLOGIC Turbo Rebuild Kit Billet Wheel Turbine Shaft Gaskets

The SPOOLOGIC Advanced Turbo Rebuild Kit SL-900-021-K03 is a bundled, complete rebuild package for 2004.5-2005 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LLY Garrett GT3788VA applications. It combines a SPOOLOGIC base rebuild kit with a new billet compressor wheel, turbine shaft and a complete gasket set, so you have everything needed to restore the turbo to factory performance in one box.

Features

• Billet compressor wheel
• Turbine Shaft
• Extreme duty journal bearings and spacer
• 360° thrust bearing and collars

What's Included

• 1 SPOOLOGIC Basic Turbo Rebuild Kit — SL-210-021
• 1 SPOOLOGIC Turbine Shaft
• 1 SPOOLOGIC Turbo Gasket Kit — SL-310-023

Fitment

• 2004.5-2005 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LLY

Common Garrett GT3788VA Failure Symptoms

If your 6.6L LLY Duramax turbo is showing any of these symptoms, a full rebuild is recommended:

• Variable vane geometry sticking or hanging — slow spool, lazy throttle response, soot buildup in the cartridge
• Excessive shaft play or oil seal leakage — blue smoke at idle, oil residue in the intercooler boots, end-play beyond OEM tolerance
• Bearing failure — whining, grinding, or whistling that scales with RPM
• Loss of boost and reduced power — turbo not building rated boost under load, derate codes, excess EGT

Advanced Rebuild Kit — Everything in One Box

This package supplies the rebuild components listed in What’s Included for the Garrett GT3788VA turbocharger.

Balancing Notes

The compressor wheel and turbine shaft are individually balanced. Balancing the assembled rotating assembly is recommended best practice.

⚠️ Emissions Notice

Not CARB approved. Not legal for sale or use in the state of California.

⚠️ DIY Product — All Sales Final, No Warranty, No Returns

This SPOOLOGIC turbocharger repair product is intended for experienced turbo builders and qualified technicians. Proper installation requires suitable tools, careful inspection, and correct assembly. All sales are final—no warranty, returns, or exchanges. Confirm compatibility before ordering. See the SPOOLOGIC Warranty Policy for details on products sold without a warranty.