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.

Every part in this kit is built to OEM specifications and pre-tested for fitment and balance. This is a complete, ready-to-install package — no sourcing individual components, no mismatched tolerances, no waiting on backorders. Built for the Garrett GT3788VA on 6.6L LLY Duramax applications.

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

Each SPOOLOGIC advanced kit bundles the SL-210 base rebuild kit with the additional wear and upgrade components that fail or get replaced at rebuild time. Buying the kit costs less than sourcing the parts separately and guarantees every part matches the Garrett GT3788VA platform.

What's Included

• (1) Billet compressor wheel
• (1) Turbine shaft and compressor wheel assembly
• (1) Set of extreme duty journal bearings and spacer
• (1) 360° thrust bearing and collars
• (1) Full set of piston ring seals
• (1) Full set of O-rings and snap rings
• (1) Complete gasket set

⚠ Not For Sale In California

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

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

This rebuild kit is a DIY (do-it-yourself) product intended for experienced turbo rebuilders and qualified diesel technicians. Successful installation requires proper tools, OEM service procedures, cleanliness standards, and balancing equipment. Because SPOOLOGIC cannot control installation quality, all sales are final — no warranty, no returns, no exchanges. By purchasing this kit you acknowledge that you are responsible for correct installation and post-rebuild verification.

Features

• Advanced bundled rebuild kit — base SL-210 kit plus billet wheel + turbine shaft upgrade components in one box
• Extreme duty journal bearings and spacer for higher load capacity than OEM
• 360° thrust bearing and collars handle high-boost thrust loads
• Direct-fit for Garrett GT3788VA on 6.6L LLY Duramax applications
• All Internal components built to OEM specifications and pre-tested
• DIY product — installation by a qualified turbo rebuilder required