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    1. Introduction Forum

      Welcome to the New BigMackTrucks.com Forums! Take a minute to create a new post here and introduce yourself. Tell us a little about yourself and your passion for old iron!

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    2. Truck Stories

      This is a forum for you to tell us about your truck's history! Every old truck has some type of story behind it and we would love to hear about it! Be sure to include photos if possible...

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  2. General Discussions

    1. Antique and Classic Mack Trucks General Discussion

      This is where you can talk about anything related to antique or classic trucks! If your topic is something specific, try to use the correct forum below.

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    2. Modern Mack Truck General Discussion

      This forum is for general discussions about modern Mack Trucks! Granite, Vision, Rawhide, Pinnacle...etc. Specific topics can be posted in the forums below.

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    3. Mack Dealer & Corporate Forum

      This forum is for Mack Dealers and Mack Corporate personnel only. If you are a Mack Dealer, or Mack Employee, PM the forum moderator below with your name and dealer code and you will be moved to the Dealer Group and be able to participate in this forum.

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    4. Mack Truck Q & A

      This forum is for pressing questions concerning Mack Trucks...emergency maintenance questions, pre-purchase questions, etc...answers can be rated by users and the higest rated answers will show first!

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    5. Mack on the Silver Screen

      This forum is for discussing various TV shows, commercials, music videos, songs and movies that had Mack Trucks in them!

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    6. Mack Scale Model and Diecast Corner

      All discussions about Mack scale model building and diecast models go here!

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  3. Specific Topic Forums for Antique & Modern Trucks

    1. Engine and Transmission

      This forum is for engine and transmission related topics

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    2. Driveline and Suspension

      This forum is for driveline, carrier, front and rear axle, steering and suspension topics

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    3. Air Systems and Brakes

      This forum is for Air System and Brake related topics

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    4. Electrical, Electronics and Lighting

      This forum is for electrical, lighting and mobile electronics topics

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    5. Exterior, Cab, Accessories and Detailing

      This forum is for topics about exterior, cab, paint, trim, bumpers, emblems, visors and also topics about keeping that truck looking its best!

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    6. Fire Apparatus

      Forum for discussions about Fire trucks and specialized fire fighting equipment.

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  4. Odds and Ends

    1. Odds and Ends

      This forum is for non-truck related topics. Talk about interesting web sites, current events, tell jokes, post funny photos...etc.

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    2. Trucking News

      News and information from the entire trucking industry

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    3. Other Truck Makes

      This is the place to show off all your other trucks that are not Macks. They can be antique or modern trucks.

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    4. Tractors and Equipment

      This forum is for you to talk about Farm Tractors and other misc. equipment such as trailers, dozers etc.

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  5. Market Place

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    3. Feedback Forum

      Please leave feedback for other members you have done business with here. This will help members trust (or not trust) other members. Please be professional with your remarks...good or bad.

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    4. Transportation Board

      This forum is for posting and finding transportation opportunities for your antique hobby trucks and parts around the country. Please keep rates reasonable when posting a route...

      769
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    5. Watt's Truck Center   (185,876 visits to this link)

      Click here to visit the Watt's Truck Center Home Page featuring The B-Model Store and tons of other parts for Antique and Classic Mack Trucks including R-Models, Super-Liners, DM's and all current models!

    6. Product Announcements & Group Buys

      This is the forum where we will post new product announcements and Group Buy Information from the B-Model Store! You can discuss them and/or ask any questions you may have here.

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  6. Shows and Events

    1. Truck Shows and Events

      This forum is for topics about truck shows and other events of interest.

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  7. Site Related

    1. Site Related Topics

      This forum is for BMT related comments, suggestions or problems.

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    2. BMT Wiki Support Topics

      This forum will hold the support topics created from the Wiki System.

      276
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    3. Test Forum

      This is the place to practice posting photos or testing code. Topics may be removed at any time...

      382
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  • Latest Posts

    • The German Liebherr 995 crane and the company behind it. https://www.donjon.com/ches1000.htm But major crane operator McLean (Maryland-based) is in this too.  
    • didnt he drive big rigs over that bridge to get to England ?  
    • 4 low ▶️ 5 low ▶️ 4 hi ▶️ 5i, last shift quick to keep the revs up, brings back lots of memories when I learned to drive the GM powered R190 gearbox, no syncro - double clutch/rev and slide the cogs in Great buy, congratulations. 2 exhaust pipes out the side to let the V8 be heard.
    • First, (1st) of all thanks to everyone for their input, help and guidance. Second, (2nd) I wound passing on the Mack. My little voice inside just said NO. They say first impressions are everything. There was just something about the truck and the hard sell tactic the seller was pushing. One of the first flaws I noticed on the truck was the hole in the intake tube. That would have been the first thing I would have fixed. How obvious of an easy fix would it have been for the seller to just temporarily fix the problem with duct tape. I have no idea how long the truck was run that way. It is an issue I didn't ignore while looking at the truck. I don't want to talk bad about the seller but there were a lot other issues that turned me away from buying it.  Third, (3rd) perhaps the worse part is I bought a GMC - Combination with an Equipment Trailer. I was looking for a (not for hire) truck and trailer to haul around my Skid Steer and Mini Excavator. Found the GMC for sale with a trailer for slightly more then the Mack alone. Sorry, to the faithful. Maybe I shouldn't even mention GMC? Well at least It isn't a FORD! When I started out looking for a dump truck I would have preferred a Mack but I was willing to settle on a JIMMY. Definitely wasn't interested in a FORD of any kind.  If there is any consolation? I had he Jimmy Hauled home on a lowboy trailer drawn by a Mack Tractor.    
    • No reason you can't run low rear in O/D front. The rear doesn't care, a worn driveshaft might as you are pushing it at its fastest speed, something not always done in high. It would be like saying you can't run any rear fast. It isn't the rear but the driveshaft that has limits. Run a rear real fast and you'll have heat issues, but unless it already has a problem, it will not make one.  Without knowing the trans ratio it is hard to say what is "progressive" and what is not. My K-7's go 4-lo, 5-lo, 4 hi 5 hi (working 5 speed) but I find the steps too close together to be of much use, with a big step between 3hi and 4 lo.  I ran my Marmon with a .73 od in top (15 O/D) in low but had to be careful not to push the driveshaft speed above critical speed. When I would feel it I would upshift the rear and down the main. Really pulling hard in 15th low, was close to 14th (direct) in high, but there was a slight difference, nothing the 3406B couldn't deal with.
    • Most times they say don’t run 5th with the axle in low is because it’s not a progressive shift from 4th over. With 5th being overdrive and depending on the two ratios in the rear it actually makes 5th under slightly lower than 4th over. At least that’s the way it was on ford and Chevy medium duty trucks with Eaton two speed rears. If 5th was direct then 5th under was a progressive shift from 4th over. 
    • Do some checking.. I have heard that in 5th AND you run the 2 speed rear on the low side it tears things up?????  4th over to 5th over and back..
    • Wow, that’s pretty much what I was going to do …. Similar for temporary spraying… bob
  • Latest Topics

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    • Sunny Gill

      Second Hand Mini-Tractors in India
      Mini tractors have gained immense popularity in India, mainly due to the country's small-scale land holdings. At TractorKarvan, we boast an impressive collection of over 10 pre-owned mini tractors available for purchase. The Mini tractor second hand price is a very affordable and top-notch model from leading manufacturers, including Eicher, Swaraj, Massey Ferguson, Mahindra, and Sonalika, among others. Before deciding to invest in a used Mini Tractor, it's crucial to conduct a thorough assessment of the model to ensure it aligns with the specific tasks you intend to undertake. Known for their robust engines and durable build, tractors are renowned for their longevity. It's advisable to meticulously examine the tractor, checking the brakes, transmission, engine, and all other mechanical components. A well-maintained and regularly serviced used tractor is likely to outlast other
      Brands. If you're considering the purchase of a Second Hand Tractor, we invite you to explore the comprehensive range available on the TractorKarvan website. With our diverse selection of over 10 old mini tractors for sale, we aim to cater to your specific agricultural needs and preferences. 
       

      · 0 replies
    • 1961H67  »  LuceExcavation

      Very Nice! You just can’t have too many Superliners! 
      · 0 replies
    • Joe Spaniak

      hi everyone   just bought a 1983 mack cab over mh600 to restore  i never restored a truck before any advice
      on where to start  i really want to make it a nice looking truck to drive not a show truck
      · 0 replies
    • Steerefarm

      Hello Everyone! My name is Buster and I am from Rhode Island . Been running Macks for 52 yrs starting with a B60T tractor and B81 Ten Wheel Dump as a kid ,  and they have been good to me... we run 2 RD688S Dumps , a 2010 CHU Tractor ,an RW713 tractor recently acquired, and a 90 RW713 project tractor we are in the process of building ..Thanks for welcoming me as a member  
      · 0 replies
    • wishiknu  »  Barry

      Good morning. I am new to this site. I have absolutely no idea where to post a question about our truck. I was hoping you could help me. Or tell me who can help me.  
      · 0 replies
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