Cummins
Shop All
SKU #: GZ-GA400
MPN #: GA400
Grizzly Remanufactured Replacement EGR Cooler 04.5-05 GM 6.6L Duramax LLY
Description
The EGR cooler in your LLY Duramax engine is designed to cool EGR gas before it gets reintroduced into the engine. Over time your cooler can crack and allow for exhaust gas to pressurize the cooling system or coolant can make its way into the turbo and exhaust system leading to other failures. This replacement EGR cooler from Grizzly will restore proper operation of your trucks EGR system. The Grizzly EGR cooler is designed to meet or exceed factory specifications and is a direct bolt in replacement that comes complete with gaskets to ensure a leak and hassle free installation.
CORE CHARGE
What is a core charge?
Enter your zip and we'll see if installation is available.
- Request quotes from local installers at checkout
- Compare options and choose the best fit for your install
About WrenchConnected
WrenchConnected is an independent installation marketplace operating in partnership with Diesel Power Products.
How it works
After checkout, we route your vehicle info and part SKU to verified installation shops near you. Local installers review the job and submit competitive bids; you pick the shop you want based on price, reviews, and availability. Your name and email stay private until you select an installer.
Pricing
You pay for the bid from your preferred shop. The full amount is shown before you confirm — installers cannot add charges without your written consent. Payments are processed securely by Stripe.
Your privacy
During bidding, shops see only your service ZIP code, vehicle year/make/model, and the part SKU — not your name, email, or address. Only the shop you select receives your contact details after payment. We never sell your personal information.
More detail at wrenchconnected.com.
FEATURES & BENEFITS:
- Meets or Exceeds Factory Specifications
- Direct OE Replacement
- Restores EGR Operation
FACTORY CROSS REFERENCE:
- Replaces OEM Part Number: 97303654
About Grizzly Products
High quality emissions components are hard to come by. That's where Grizzly Products come in. Grizzly Products manufactures high quality diesel engine components for modern diesel engines that will not let you down. Grizzly's stringent recertification methods used in our remanufactured and new products, along with the use of high-quality replacement parts, make for an unbeatable and highly durable product line that helps support your service reputation.
Video
Deferred Core Program Explanation
Ben explains the benefits of our deferred core program and how to return your core when necessary. Not sure what that is or need to send your core back? Give this video a watch for information and answers to many FAQ's.
If you’d like more information on our core return policy or need to start the core return process just give us a call at 1-888-993-4373.
Blog
June 05, 2026
Your exhaust system moves spent gases out of the engine and away from the cab. The muffler...
Read MoreResonator vs Muffler: Key Differences Explained
June 03, 2026
The 1st gen Cummins ran from 1989 to 1993. Dodge put the 5.9L 12-valve inline-six into the...
Read More1st Gen Cummins Pros and Cons
June 02, 2026
Your 5.9 Cummins will tell you the lift pump is starting to go before it stops working...
Read More5.9L Cummins Lift Pump Failure Symptoms Guide
May 07, 2026
If you own a 2003–2007 Ford Super Duty with the 6.0 Powerstroke, the oil cooler is one...
Read MoreBest Oil Cooler for 6.0 Powerstroke (Top Picks Guide)