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Chevy Silverado/GMC Sierra's w 8100/Allison



  • How do I find the messages I have posted and any responses to them? I can't seem to get anywhere in this message posing forum. If anyone knows how to do this would they please email me directly (since I can't find anything in here, I certainly wouldn't be able to ferret out any response).

    Thank you
  • n75v111n75v111 Posts: 243
    8100/3.73 ---- First two half a tanks 10.3mpg -- driveing mixed town/hwy - but still 'lightfooten' it.

    Have pictures with 'Ugly Black Flairs' removed, Stones replaced with Cooper WL 245 'E's A/T's today
    (Tire dealer orderd in Michlen 245 'E's but turned out NA w/White Letters so said to heck with and put on the Coops - They look good and better warrenty-- what the heck!!!)

    Also got Boards on -- God!! It's been a Pain in the *** just getting in to the dard thing and my wife kinda has bad knees so we had to do something.

    I'm going to do a follow up post to see if i can just drag the pics into it and post em that way but if it don't work send me your e-mail address. (

    Holding my breath - Here goes Nothing.

  • n75v111n75v111 Posts: 243
    Post some very very easy to follow step by step A, B, C posting instructions or send me an email

    Sorry!! 75v
  • falknorfalknor Posts: 27
    We went to see our son this week-end. 642 miles aout 95 percent Hwy and 5 percent town driving, and averaged 12.29 MPG. Ran about 75 most of the time. I let my son drive while we were there and he took it on the Highway and ran it up to 90 MPH for a short period. Truck runs and rides great. I have the LT 8.1 w/allison 4.1 2500HD loaded. Happy trails to you. Dave
  • n75v111n75v111 Posts: 243
    Have 'ado 8100/4x4 HD SB & getting ready to mount my Reese 15000.

    Starting to determine how much rear window clearance vrs Axel to window space to decide just how far aft of the Axel to position the PIN pivot location.

    Talked to Hitchhiker dealer today and he said that Reese has and Slider Adoptor Devise that allows you to mount the 'A' Frame and Hitch tilting platform support assembly directly to which inturn allows approx. 9" slide back when parking. Reese dealer catalog show a price of about $330 but can't tell how it works in combo with current 'A' Frame hitch unit.

    Can't seem to get into the Reeseproducts web page but don't think they do a very good jop of showing detail anyway.

    Anyone know the 'nitty gritty' details on this??


  • I always heard TPW stood for Target Production Week rather than To Production Week. My "target week" was bumped several times. I checked my mileage again. It is holding at 10 MPG with a combination of 70%city/ 30%highway driving. Without question I lost .5 to .7 MPG moving up to 265 tires. n75, thanks for the address. I'll be in touch.
  • eric2001eric2001 Posts: 482
    Saw TPW on another sight. Guy sounded like someone in authority @ Pontiac plant in Flint. He said it was Truck Projected Week.

    On another note, if you had it to do all over again, would you still go with the 265's, or something else?
  • bsilerbsiler Posts: 30
    having Allison problems yet. I would like to hear about the goods and the bads!

  • hunter98hunter98 Posts: 273
    People that want to change out to a taller tire for looks, really ought to look at a premium 235x85R16. They are the same height as a premium brand 265, are about the same width as the factory, and may actually increase milage because of the 4% more distance traveled per engine revolution. The only possible decrease would be from increased air flow below the truck.

  • markbuckmarkbuck Posts: 1,021
    Agree 100% with you on the LT235/85-16 E choice for the HD line...
  • khbushkhbush Posts: 19
    I have the reese quick slide you are talking about. You use the same bed rail insatll kit but evrything above that is different. The whole apparatus slides rearward 9 inches to give the necessary clearance. I have been told that mounting a hitch back of the axle severely affects handling. If you have the installation kit the hitch is about $500 at
    If you need any more info email me at
  • eric2001eric2001 Posts: 482
    For all of you that have ordered these wonderful trucks, how long did it take the dealer to give you any information? I ordered mine 2/24 and the dealer has no information as of yet. They claim the computer doesn't show anything, yet other people stated the received the TPW & SON (truck projected? week & sales order number) within days of ordering. Could my dealer be holding out? Maybe he didn't have the allocation? HELP!
  • sf0383sf0383 Posts: 204
    It probably has to do with allocation. I waited 8 or 9 weeks after placing the order to get the TPW ( Targeted Production Week )Once you get that things start to happen pretty fast. Supposedly Chevrolet "pulls" the orders once a week. Your dealer should be able to tell you which day. Then it is a matter of calling them once a week or so to see if your order has been pulled and assigned a TPW.
  • falknorfalknor Posts: 27
    You are most likely right about not having an allocation. I placed an order on Nov 22 and ended up cancelling it on Feb 28 as I found a LT 2500HD LB at another dealer and bought it. Two days after I canceled my order the dealer received a TPW. He said that he will go ahead and get it in and sell it. Coverts Chevy in Bastrap Tx has this truck coming in.(Harry Green 1-800-937-7076) Happy trails to you. Dave
  • nelson22nelson22 Posts: 3
    I'm new here and would have noticed that there seems to be some very knowledgable people here. I see that with the diesel or 8.1L, the four-speed auto tranny is not an option. That tells me that it must not be beefy enough. According to edmunds though, a manual five-speed or manual six-speed is available. Does anyone have experience with these transmissions. I drive a stick now and don't mind one bit. It looks like it would save a chunk of money also. Thanks.

  • n75v111n75v111 Posts: 243
    everone for the info on the Slider for 8100/3.73 LT 4x4 SB

    THIS TRUCK IS AWESOME!!!! Quality looks to be excellent. All you guys waiting hang in there.
    Ordered Sept. 05 delivered March 1st.

    But Get Rid of the Firestones.
    My Cooper/Michlien tire dealer exchanged (4) for Coop 245 WL A/T E's for $198.00 on road (they looks great).
    Mich's were going to be over $400.00 and they don't even make em in WL's plus NO road hazzard.

    I have the 15000 w/o the slider - Ordered today the Slider unit to switch my 15K over (which i have not mounted in truck yet) -- Use my rails and upper yoke/tilting head assy etc.

    Kwik Slide conversion $245.00 plus 32.25 UPS shipping from Discount www.sales@rvpartsoutlet San Jose--(local best price was at list $330.35 w/no certain on hand date)-should have end of week.

  • eric2001eric2001 Posts: 482
    The 8.1 or the 6.6 Duramax are both available with the 5-speed automatic, or the six speed standard (not in LT/SLT flavors). The 4 speed auto is for 6.0 only. The bigger motors have the Allison auto trans with many nice features. Pick your flavor.
  • eric2001eric2001 Posts: 482
    According to my dealer, he had the allocations, and was given an extra window for another the weekend I ordered. Or maybe they are just salesmen, yanking my chain...
  • sf0383sf0383 Posts: 204
    Another place you can look is at They have a section there that will show what cars and trucks are on hold for whatever reason at the different manufacturers. It could be that some particular option you have ordered is on constraint. From my own experience and others that I have read here you can expect to wait 12-16 weeks for the truck. Anything faster than that consider yourself lucky. But they are worth the wait

    Good Luck
  • n75v111n75v111 Posts: 243
    Well, Obviously it's taking me awhile to get totally use to this 8100 LT.

    I just noticed that my 'REMOTE Cassette Tape Player' is a 'REMOTE CD Player' instead. (AND NO it does not function other than to fill in the hole)

    Just when I had been braging about GM Quality (:-)

  • sf0383sf0383 Posts: 204
    I don't understand what you mean by remote
  • obyoneobyone Posts: 8,054
    not part of the head unit.
  • n75v111n75v111 Posts: 243
    The CD player in the Radio head unit as oby1 indicated. The Cassette player is down below in the face of the center console. (Show clearly in the 52pg brochure)

    The '00 model year was just reversed. I guess GM had some '00 CD units miss-identified as Cassette units in the wrong ben and obviously QA DOSEN'T check out the sound system for function.

  • mgdvhmanmgdvhman Posts: 4,162
    My 2K 2500 LT has the CD down low and crappette above....1.5 years and 30K later....I have yet to even see if the cass. works?!

    Above is a better place for the CD

    - Tim
  • elderdog1elderdog1 Posts: 10
    hello all ,i have just under 2000 miles on my HD 2500 w/ 8.1 , allison and 3.73, love it so far ,gas milage 9/10
  • 1i2cu1i2cu Posts: 32
    When you purchased your Cooper A/T's, did you consider Cooper L/T's ? Are your A/T's quiet or do they sing on the highway ? Being out west in 'Shake & Bake' country. I'm not that familar with Cooper tires, are they O.K ? Average ? or Good ? Since I don't have snow and only a little rain, I'm leaning towards the L/T's or should I reconsider and go with the A/T's ? The Cooper Tite Store does not stock them, he would have to order them, so I need to be sure which ones to get.
  • n75v111n75v111 Posts: 243
    Guess your asking loyalgmcguy about the Coops.

    But in case not.

    I liked the Tread better on the A/T's. Not noisy at all.

    Coop tires have Excellent reputation here in the Mwest (Smaller companys have to have good product or can't compete with GY's GR's Mich's etc.) but if you don't have any need for the tread go with what you like better.

    Sorry if I steped in here where not wanted!!!

  • 1i2cu1i2cu Posts: 32
    Thank you for the info on Cooper Tires n75v111.
    The weatherman says it should be in the 80's out here in 'SHAKE & BAKE' this weekend.
  • owenm1owenm1 Posts: 29
    That's what the dealer is telling me. Just got finalized pricing today, after I added fog lites and snow plow prep after the initial order. So, my 8.1 2500HD GMC SLE 4wd ext cab long bed, 4:10 locking diff will have a VIN# next week. Color is Polo green, any comments on that color? I'm interested in the Allison transmission fluid change procedure. Anyone done one yet?
  • I personally love the color, that and the blue, GM has some really good truck colors for these Silverados, even a boring color like peweter just looks great.
This discussion has been closed.