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At T3 Speed Shop, we treat your Chevy or GMC Duramax as a masterclass in diesel engineering—a platform known for its smooth Allison transmission and high-revving power. Whether you’re driving the original LB7 or the high-tech L5P, we know these engines inside and out. Leveraging over 15 years of focused diesel expertise and OEM-level diagnostics, we provide the proactive maintenance and performance engineering required to keep your Duramax running with absolute reliability.
We follow a philosophy that proactive maintenance prevents reactive repairs. Our high-altitude service intervals are designed to protect your investment from Utah’s extreme grades and summer heat.
Tiered Maintenance Schedules: Precise oil, fuel filter, and Allison transmission services at 7,500 and 15,000-mile intervals to maximize component life.
Fuel System Protection: Essential fuel filter swaps and lift pump inspections to protect expensive common-rail injectors from air and contamination.
Fluid Analysis & BG Products: Utilizing high-quality BG fluid exchanges to enhance engine longevity and prevent internal sludge buildup.
Cooling System Support: Expert service for water pumps (addressing plastic impeller failures) and radiators to prevent the overheating common in LLY models.
A Duramax is only as strong as its fuel delivery and boost pressure. We use GM-specific scan tools to pinpoint issues without the guesswork.
Fuel Injection Specialists: Expert diagnostics for LB7 "haze," injector balance rate checks, and CP4-to-CP3 conversion kits to eliminate the "ticking time bomb" on LML models.
VGT & Turbo Solutions: We solve "lazy" response and vane-position codes by servicing Variable Geometry Turbo (VGT) actuators or installing upgraded Stealth or BorgWarner turbos.
Lift Pump Integration: We recommend and install FASS and AirDog lift pumps to ensure your high-pressure pump never runs dry under load.
Keeping your truck compliant and out of "limp mode" is a priority. We specialize in the complex after-treatment systems found on 2007.5+ models.
DPF & SCR Diagnostics: We resolve frequent regeneration cycles, clogged Diesel Particulate Filters, and DEF sensor/heater failures.
MAP Sensor & EGR Service: Cleaning and servicing MAP sensors and EGR valves to prevent soot buildup that triggers check engine lights and power loss.
Utah State & DOT Inspections: Comprehensive OBD emissions testing and on-the-spot renewals to keep your GM road-legal.
Your engine’s torque is only useful if it reaches the ground. We strengthen every link in the GM chassis.
Allison Transmission: We service and strengthen Allison 1000/2000 series transmissions, addressing cooler line leaks and installing deep pans for better temperature control.
Kryptonite & Steering: We are Utah’s premier installers for Kryptonite Steering & Suspension and Cognito kits, fixing the "sloppy steering" and front-end wear common to GM HD trucks.
Brake & Hubs: Comprehensive inspections and heavy-duty pad/rotor replacements for maximum safety when towing through the Wasatch Front.
Dealer-Level Tech/ Local Shop: We use advanced GM-approved diagnostic equipment and Hunter Alignment systems, providing dealer accuracy with the transparency of a family-owned shop.
Specialized Expertise: While others are "general" mechanics, we focus exclusively on the specific nuances of the LB7, LLY, LBZ, LMM, LML, and L5P platforms.
Towing & Convenience: After-hours key drop-off and professional towing services ensure your truck gets to us even when you can't drive it.
L5P 6.6L V8 Duramax turbo diesel engine (2017-Present): MAP sensor service, Denso fuel system maintenance, and turbo protection.
LML (2011-2016): CP3 conversion kits, DEF system repairs, and Allison transmission cooling.
LMM (2007.5-2010): DPF diagnostics and fuel system reliability mods.
LBZ (2006-2007): The "Holy Grail"—maintenance, performance tuning, and cooling upgrades.
LLY/LB7 (2001-2005.5): Injector replacement, overheating solutions, and head gasket reinforcement.
Call T3 Speed Shop: (801) 669-2890
Visit Us: 545 W Billinis Road, South Salt Lake, UT 841157
Hours: Monday – Friday: 8:00 AM – 5:00 PM
