Skip to Main Content
  • Home
  • About Us
  • My Account
  • Contact Us
  • Blog
  • Login
  • Register
cart icon 0 Items - $0
Items
Qty.
Price
Subtotal:
View Cart
Checkout
0 Items
Full Force Diesel Logo
  • Powerstroke Diesel
    • 7.3 Powerstroke 1994-1997
    • 7.3 Powerstroke Early 1999
    • 7.3 Powerstroke 1999.5-2003
    • 6.0 Powerstroke 2003-2007
    • 6.4 Powerstroke 2008-2010
    • 6.7 Powerstroke 2011-2022
    • 3.0 Powerstroke 2018-2021
  • Cummins Diesel
    • 5.9 12V Cummins Parts 1989-1993
    • 5.9 12V Cummins Parts 1994-1998
    • 5.9 24V Cummins Parts 1998.5-2002
    • 5.9 Cummins Parts 2003-2007
    • 6.7 Cummins Parts 2007.5-2023
    • 5.0 Cummins Nissan Titan XD
  • Duramax Diesel
    • LB7 Duramax 2001-2004
    • LLY Duramax 2004.5-2005
    • LBZ Duramax 2006-2007
    • LMM Duramax 2007.5-2010
    • LML Duramax 2011-2016
    • L5P Duramax 2017-2023
  • Shipping Forms
  • Rewards
  • Core Buying
  • Military Discount
  • Help Resources
    • Helpful Videos
    • Remote Help
    • Dealer Access
  • FFD Merchandise
    • Hats
    • Shirts & Hoodies
    • Stickers
  • Garage Sale!
  • Contact Us | Phone
  1. Home
  2. Duramax Diesel
  3. LLY Duramax 2004.5-2005

LLY Duramax Performance Parts & Upgrades

LLY Duramax Truck
LLY Duramax 2004.5-2005 subcategories
  • Cold Air Intakes Cold Air Intakes
  • Tuners & Programmers Tuners & Programmers
  • Turbo Turbo
  • Fuel System Fuel System
  • CP3 Pumps CP3 Pumps
  • Engine Engine
  • Exhaust Systems Exhaust Systems
  • Fuel Tanks Fuel Tanks
  • Intercoolers Intercoolers
  • Transmission Transmission
  • Maintenance Maintenance
  • Steering & Suspension Steering & Suspension
  • Axle and Differential Axle and Differential
  • Exterior Accessories Exterior Accessories
    Fuel Tanks | Fed Covers | Mud Guards | Lighting
Midway through the 2004 model year, GM released the second-generation Duramax, RPO code LLY. Although much of the LLY’s internals match what you’ll find in the LB7, this version of the 6.6L V8 brought an improved injector design, variable geometry turbocharging and cleaner emissions to the table. On early versions of the LLY (’04.5-’05.5 model year GM trucks), horsepower climbed by 10 to 310hp while peak torque remained at 520 lb-ft—but became available 200 rpm sooner in the power band (1,600 rpm vs. 1,800 rpm on the LB7). Later model LLY mills (‘06), which arguably had more in common with the LBZ that followed the LLY, packed 605 lb-ft of torque.

The 2nd generation Duramax is known as the LLY. Similar to the LB7, the LLY Duramax is reliable, powerful, and lacks most of the emissions found on modern day diesel trucks like the L5P. LLY Duramax trucks don’t suffer from the same injector failure problems that LB7 trucks frequently had. Instead, many LLY Duramax problems stem from overheating. A new variable vane turbocharger and an EGR system were also added.
  • Stay Connected
  • facebook
  • youtube

Mailing List

Ooop! The email you entered isn't valid.
WooHoo! You subscribed successfully.
Ok! You're unsubscribed.
Quick Links
  • Blog
  • Join Our Team!
  • Product Index
  • Category Index
  • Terms and Conditions

Menu Links

Categories