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Silverado / Sierra 2500HD Duramax ... any thoughts?



  • Lonebull - I have an '03 2500HD Duramax 6600 w/ a 5 spd auto Allison, about 12000 miles. I had the "service 4WD" message. 4x4 would still work, just kept getting the message. After 3 or 4 visits to the dealership and them re-programing the computer with out fixing the problem, the service department finally contacted Chevy and was told to replace the Transfer Actuator Assembly (I think located in on the rear transfer case). They did and I have had no problems since then. Hope this helps. My dealer is Five Star in Warner Robins, GA.
  • gmcyamaha - My truck is an '03 2500HD Crew Cab Duramax 6600 w/ a 5 spd auto Allison, with about 12000 miles. It makes the "crackling" sound in that spot, at that speed as well. Here is what I was told by Five Star, in Warner Robins, GA. It is caused by a bug shield. My truck has an after market bug deflector on it with more of an upslope than the GM bug shields. They told me a GM one "should" not make the noise. If it is making the noise with out a deflector on the hood your dealership should try and fix the problem. Do you have a bug shield? If so, this is how I was told to alleviate the problem. Open the front doors, pull off the rubber seal and remove the screws (about 3 on ea. side). Then put a strip of two sided tape on the molding. I have not tried this yet, but that seems to be the "talked about fix" for this problem. My service advisor said he has been successful with this solution. We'll see, I'll let you know!
  • catamcatam Posts: 331
    I read an article on about the new Dodge Cummins "600" as in 600 lb.ft of torque. The article very briefly mentions the new D- Max will have 590 lb. ft and 310 hp. Personally I'd rather have the D-max and the better truck it sits in. Anyone know when they will be available???
  • jaijayjaijay Posts: 162
    You can order an RPO LLY (310/590) Duramax now.
  • I am thinking about buying a '01 2500HD 4x4 ext. cab 8.0L w/ 13000 miles. I have never owned a HD truck and would appreciate any advice on likes and dislikes. Also what does the SLT package include.
  • catamcatam Posts: 331
    The SLT package on the GMC is the top end package. It will include leather seating, front buckets, on-star, 6 dish in dash changer, etc.
    One important detail you will want to know is what tranny is in it. Someone correct me if I am wrong, but you could have eithe the 4 spd auto (4L80), the 5 spd auto Allison, or the 6 speed manual. The allison is generally the best choice unless you're like me and prefer to manually go thru the gears.
    Also be prepared for gas mileage of around 10-12 MPG.
  • paisanpaisan Posts: 21,181
    Is that for the gas or diesel model?

  • bigfurbigfur Posts: 649
    that HAS to be for the gas engine. The diesel i have heard are getting around 15-18MPG usually.
  • jaijayjaijay Posts: 162
    I have seen 19-22 on highway alone driving within the legal limits.
  • v12powerv12power Posts: 174
    Depends on how you drive. I will never buy another d-max based on the poor milage. I am on my second one now. I need to drive it from MN to CO on a fairly regular basis. The speed limits are pretty high the whole way 70-75. If you cruise at 75-80 in the d-max, you can expect 10 mpg at best, it is really quite a sad thing. I could have saved $4500 and bought the 8100 to get that kind of milage. 2wd six speeds do well on fuel, not much else. My trip computer shows about 13 mpg ave with 15k miles on it.

    If you want good milage from a big truck the Dodge Cummins is the only way to go. Mine gets 18-19 cruising at the aformentioned speeds. It has more power, is quieter at speed, and so far has had fewer problems than my d-max.
  • I just bought a 2500hd 4x4 Silverado with the duramax/allison combo and am averaging over 17mpg in combined city/hwy driving. I've only had it a month, but I'm loving it so far.

    I also own a Toyota Tacoma 4x4 with the 3.4 engine and manual tranny and can honestly say the Duramax has equaled it in fuel economy driving the exact same routes. An impressive feat for a much larger truck.

    Furthermore, the handling of the Silverado is, in my opinion, better than the smaller truck. The handling of the Silverado is actually the most impressive thing about the truck. It handles like a car. I live in the country and drive alot of narrow, winding roads and this thing handles them effortlessly.

    This is the first Chevy I've owned since I bought a (new)1970 Z28. Wish I still had that car.
    If it continues to perform like it has so far I will be a very satisfied buyer.
  • dmaxdmax Posts: 3
    '04 Chevy 4x4, Extended Cab, Long Bed, LB7 with Allison trans.

    I usually drive 5-8 mph over the posted speed - thats 70-73 around here. Steady driving is about 22 mpg, 15 miles to town and around town I get 18.5
  • paisanpaisan Posts: 21,181
    I'm impressed with that. I usually do 70-75 with my mid-size SUV and get about 16mpg on the highway and 12-13 in the city. I can't wait to buy a diesel!

  • I have a 2003 GMC Sierra 2500HD Duramax. The passenger side Day Running Light will not stay on. I have replaced the bulb and cleaned the contacts and it works for awhile, then goes out again. Anyone else have this problem?
  • slramsslrams Posts: 4
    I am currently towing my 7k (lbs.) 5th wheel with my 2001 GMC 1500 5.3 Ext. Cab short bed truck. I'm considering going to the Sierra 2500 HD Duramax Crew Cab Short Bed as my next truck. Does anyone have any information on the 2004 Crew Cab short bed size? Is it long enough to accomodate the 5th Wheel and hitch? What is the towing capacity of this engine with the Allison automatic transmission?
  • catamcatam Posts: 331
    To answer a few ?'s.
    The bed length of the CC SB is 6.5 ft, the same as your current SB, so if yours works for towing so will the new one.
    Overall vehicle length is about 239 inches.
    When equipped with the HD towing package, the Duramax/ Allison combo has trailer towing capacity of 12K lbs for hitch mounts, 5th wheel ratings vary depending on application, but figure around 15K.
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