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Chevy Silverado/GMC Sierra's w 8100/Allison



  • n75v111n75v111 Posts: 243
    Keep post on how you end up with the Aux tank. I'm planning the same thing and would like to keep it out of the box although that has some advantages as you can have a switch operated solenoid valve and gravitiy feed into the factory tank.

    Mine won't be here for another three weeks but was going to look at the spare tire area with an electric fuel pump for transfer. Interested to see how you figure this out. Been practically living under some the dealer units on their lots after hours with picture under to see where to mount the thing.

  • sonjaabsonjaab Posts: 1,057
    On hot vehicles Mr. dealer does not HAVE too
    on GMS GMO .They can refuse !! Go to GM Family for the details........
  • Things must be easing up a bit ... please see my post: Two 2500HD 8.1L 4WD CC SBs Coming, One Available ... in ... Friday was a good day!!
  • n75v111n75v111 Posts: 243
    congrats on the Big Black LT Ex. Cab !!!!!

  • Yessss... Took delivery of my 2500 HD 4WD Xcab 8100/Allison/4.10 yesterday. The truck looks great and runs strong. Kind of makes me forget the 3 times that my TPW was bumped up. It is definatly well worth the wait. I am very interested in changing those wimpy looking 245s out and getting a set of 285s on ASAP. From what I understand the Hypertech unit for the HD is not yet available, what have you guys that have 285s done to compensate for the larger tires? Is there any chance that running the old shift points could damage that Allison tranny? After waiting 14 weeks for my HD I sure don't want to put a hurt on it this soon. Any firsthand experience will be appreciated. I'm a little leary of asking the service department about it... I mean if they say not to do it and I go ahead and do it anyway I might have a warranty problem on my hands. But I'm sure that sooner or later they are going to see the truck in their shop with the larger tires anyhow. It's like a Catch 22 thing. Feel free to e-mail me or post here with any advice... I'll check back later, right now I feel the need for a ride.

  • Thanks on the Congratulations. I picked it up on Thursday night, Feb. 1. It had came in the previous Saturday. I haven't got my listing of DeWalt tools I can select yet, but when I get them they will be put to good use. The pickup is beautiful, and I know a few of you out there will be pleased to know that it won't see the cow poo for a while. I have decided to keep my 1988 F250 Ford fof the cowpoo. An interesting comparison - The Ford is about 2 inches higher that the 2500HD to the bottom of the door sills. The same is true to the bottom of the seats. And the 2500HD will fit in my garage where the Ford would not - about an inch too high. So my Corvette came out of the garage and the 2500HD went in. However, do not despair - the Corvette is in the hangar by the airplane. I took the insurance off of it, but it comes back on automatically in April. Also I might add that the Ford has considerably more clearance than the 2500HD. I took a creeper and had to be a little careful rolling under the 2500HD if I didn't want to come out bloody, however I roll all around under the Ford without a problem except under the differentails. The Ford is so high that I took the transmission out without even jacking it up. I am not complaining about the lower clearance as I suspect that I will never get it into anything that deep anyway.

    The Allison shifts really smooth, except when you are slowing down in Tow Mode - then it is pretty aggressive, which is fine with me. The pickup is very quiet with a nice solid ride, but not as rough as the Ford or the Corvette. The oil pressure surprises me a little in that when idleing it runs about 50 psi, and at 1500 runs about 75 psi. I only have 112 miles on it and 5.3 hours on the engine. I spent the whole weekend studying the manual - didn't get any work done at all except feeding the animals. I haven't got around to the OnStar yet.
  • Hey ,
    Where did everybody go? I finally get my 8100/Allison HD and now nobody's around. Well I guess I'll just have to go out for a ride. Fill 'er up.
  • hunter98hunter98 Posts: 273
    Glad to hear you got your truck. Any more details, 4x4 Cab Config, Trim, Color, Milage, comments.

  • n75v111n75v111 Posts: 243
    Just rechecked (for about the 1000th time) with Pontiac scheduling and my
    LT 4x4 XC SB starts assembly the 14th. Ordered Sept. 5th

    Supposed to know exact delivery date when I call back on the 15th.

  • Glad to hear you got your HD. What equipment did you get?
  • Hello All,
    Well I will have had the truck for a week as of tommorrow.I should get a job at the dealership, two of my friends are so impressed with the 8100 that they are going to trade in their 00 6.0s for the HD. I really have to watch myself or I'm going to get a ticket. It's hard to keep my foot out of it,and I'm not a kid either.
    My truck is a Silverado HD LS EXTCAB 4WD SB 8100/Allison/4.10, Pewter, Locking Differential, Skid Plate, Electric Shift, Trailering Package, Deep Tint Glass,& Marker lights.
    I have had a sliding rear window added. I installed the TracRac system overhead racks and a aluminum diamond plate deep toolbox. Yesterday I ordered new tires to replace those wimpy 245s, I have GY ATs 285-75-16s going on next week. They will be going on blackwall out. I will be using the stock wheels to avoid the rubbing problems that people have had due to different the backspacing on some of the aftermarket wheels. I ordered a set of Westin step bars (black, I'm going for that silver and black look) and a full set front,hump & back of the HuskyLiners this morning.I bought this truck to be a work truck, but I am going to hang onto my 93 Dodge 250 4x4 to use for jobsite cleanup etc.I would have a hard time throwing 2x4s and sheetrock out a second floor window into the back of that HD.
    I haven't kept track of my gas mileage, but so far it doesn't seem to be much worse than my old truck. After I get 1000 miles or so on it I will post my mileage.BTW regular is $2.09 per gallon here on the island.
    It's good to see that some people still hang out at this topic.
    Good Luck to all of you with your trucks.

    Marthas Vineyard,MA
  • Finally got a tpw of Feb. 19 for my 2500 'rado Lt, ex. cab, Lb,8.1/All. 3.73. It's been a long and frustrating wait,as many of you already know. It will be just in time for some spring time r.ving. Will post more if and when it gets here.[I'm still a skeptic, I'll believe it when I see it!]
  • obyoneobyone Posts: 8,065
    there are soooo many F250s around. I guess people get tired of waiting after awhile.
  • As far as the delays and the waiting goes, you are correct, GM is Ford's greatest asset. But I still won't drive a Ford.
  • obyoneobyone Posts: 8,065
    Agreed. Unfortunately for some....couldn't wait as they needed to use it for work.
  • Just returned from a 500 mile weekend trip. Gas mileage on the first two tanks was 11.9 and 13.4 with a 12.6 average. Outside air temperature was 30 degrees. At 70 miles per hour the tach only shows 2000 rpm. Truck ran great but sure wish it had a larger fuel tank.
  • Mine should be on the way. I could live with those numbers. Thanks for the info.
  • TRAMPER-You are getting exactly what I picked up on Feb. 1st. You are going to love it.

    LOYALGMCGUY - I hope I do as well, I will be very happy. I only have 260 miles on mine, so don't know how it is checking out. Yes, I too wish it had a bigger tank.
  • GMC Cust service told me today my 2500HD, 8.1/Allison, 3.73 locker (Black Crew Cab SLT with light pewter leather) is in the end of assembly and due to be shipped wed 2-14.

    I was about to give up but good things come to those who wait.

    Dogman... tell me about your sliding window.. electric or manual? Got a web site address?
  • Is your truck a 2 or 4 wheel drive. I must admit that I am impressed but not surprised with the gas mileage.
This discussion has been closed.