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10-22-2006, 11:36 PM
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2004 Duramax Rpo
I've just bought a 2004 Gmc duramax. In mid 04 they made a change to the duramax from the lb7 to the lly (I think I could be wrong). How can I tell which one I have?
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10-23-2006, 09:17 AM
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Even if you can tell me where I can find what month it was built in I can figure it out, i thought it usually said on the doors but it doesn't.
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10-23-2006, 09:54 AM
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Call your local Chevy or GMC dealer and ask them to run a GMVIS, or VIS, it will tell you the exact build date of your truck. It will also give you some of the build specs. You could ask them for the build specs and print it all.
Jason
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10-23-2006, 11:13 AM
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The 8th number in the VIN should be a 2 for LLY or 1 for LB7..hope this helps
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10-23-2006, 04:57 PM
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Awsome! Thanks guys, its a 2, LLY makes me happy
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10-23-2006, 09:03 PM
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Gotta love diesel powa!
 there;s nothing like seeing a "grandpa 5thwheel hauler" lay the smack on a z28.
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10-23-2006, 10:08 PM
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Quote:
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10-24-2006, 08:47 AM
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You bought a great truck there. I work in a diesel shop as a service manager. We have yet to have a Duramax in for any type repairs. The main part of or bussines is the Ford Powerstroke. Then the Dodge Cummins.
We also do performance upgrades. We have one customer who has a Duramax an 05 that make 600 rwhp. Talk about a ride. Of course he has spent at least $10,000 to get it.
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10-24-2006, 08:10 PM
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Good to know, so far I love it. Stock its got a bit of turbo lag but it still impresses me how fast a 7000lbs truck will move. Have any of you fooled around with power programmers? I was thinking about getting the Banks "Six Guns" it seems like it has the best features, I'll probably get an intake and exhaust first though.
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10-24-2006, 08:14 PM
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I've used the Edge, Van Aaken and Predator so far in mine.......Anything over I'd say 90 HP will limp your tranny if it's an auto.......found that out the hard way.......Edge or Banks and VA are easiest to use.......Predator ran extremely strong on mine..........EFI Live is on the list next, after the Suncoast V tranny upgrade........best of luck!! Brad
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10-24-2006, 08:18 PM
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Its not hard to make 800ftlbs of torque with these new diesels, chip intake and exhaust and you have it. What happens if you have that much power and your pulling a trailer and you decide to giver off the light? Will you snap every drive line part in them?
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10-24-2006, 08:46 PM
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I don't like the Banks stuff. It is way overpriced and over rated in my opinion. Edge has the best stuff for the Duramax that i have seen. Get an edge with Attitude Monitor. You will have a nice gauge pack and can change HP on the fly.
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10-24-2006, 09:14 PM
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What is limping the tranny? Is it something you can feel or a code? Does it mean your trannys on its way out or what. At about 80kph if I'm driving along like a granny my truck will start surging slightly like it cant choose a gear is that somewhat normal, maybe something to do with bigger tires.
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10-25-2006, 09:53 AM
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The Allison trans, if it slips tells the puter to turn the fuel off so the trans does not get burned up. They call this limp mode. On your surge, you might try to change the fuel filter.
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10-25-2006, 11:03 AM
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Quote:
As for what to watch for, make sure you're not overpowering the driveline, and watch EGTs. The allison is pretty bulletproof, the stock dodge and ford autoboxes tend to not live well under performance use.
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