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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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      This forum is for Air System and Brake related topics

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      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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    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...

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    5. Watt's Truck Center   (233,169 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.

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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...

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  8. Club Forums

    1. Mack Trucks Memorabilia Collectors Club Topics

      This club page is for all Mack Memorabilia discussions

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  • Latest Posts

    • Geoff Weeks
      Question about thermodyne transmissions

      By Geoff Weeks · Posted

      Pardon my bad drawing, I never was good at it. With a weir stat, the coolant flow through the engine for a given speed remains constant, regardless of it the 'stat is open or closed or 1/2 way between. With a conventional "stat" the flow is restricted to the small bypass line until the 'stat starts to open and more and more coolant goes to the radiator.  The weir stat provides good flow all the time, so no "hot spots" when the engine is cold but working with flow reduced like can happen with a conventional 'stat. It take a different housing to use one or the other, the seal around the weir is something not there in a housing that takes a conventional "stat. weirstat.pdf
    • Mack guy Ata
      Question about thermodyne transmissions

      By Mack guy Ata · Posted

      Thank you very much clearly i need to do my homework on the thermostats. Hopefully will find the right one. Also thanks for the info on the fan blades too. 
    • Geoff Weeks
      Question about thermodyne transmissions

      By Geoff Weeks · Posted

      Coupla comments. If you look at the line drawing Vlad posted, you'll see the thermostat goes in horizontal and the outlet to the radiator is in the center of the housing with a seal between the weirstat and the housing. Yours is a conventional type where it sits with flow over the bulb and opens to the radiator through the "shutters" in the stat.  You'll need a different water manifold, T stat housing and plumbing to switch between types. It isn't simple, and finding the right 'stat for that housing would be much more simple. Fan blades are made like that to reduce noise, nothing wrong with that type. They are common on engine without a fan clutch as they are turning at full speed (engine speed) at all times. 
    • Mack guy Ata
      Question about thermodyne transmissions

      By Mack guy Ata · Posted

      Geoff weeks sorry missed your message. My housing looks like it was ment for a thermostat like that. But still asking around shops that work on the renaults to see if i can find a good match for mine
    • Mack guy Ata
      Question about thermodyne transmissions

      By Mack guy Ata · Posted

    • Mack guy Ata
      Question about thermodyne transmissions

      By Mack guy Ata · Posted

      So a funny little update. You guys remember how i wanted a 20 speed on my truck and i might be wrong please correct me if I am. Took out the transmission today it turns out i actually have a 20 speed on it but the Lo-Lo and Lo-Split being stuck shot and the plate saying its a 9 speed. I remember someone actually telling me that i might have one on it with the wrong plate. I will share the photos i took it might be my lack of experience making me think i have a 20 speed.    Another update on the truck The guy selling it to me instead that its a b85 but it is not its a b43 dont really change much for me and i was very suspicious of it being a b85 since I couldnt find any b85 with its configuration.    Another question and maybe i should start a new post since this one is getting old but. The radiator fan is very oddly shaped distance between blades are different is there a reason for this or do i just have a terribly built fan. I will also uplod photos of it
    • james j neiweem
      MD electric

      By james j neiweem · Posted

      Saw an add on face book showing the new MD electric with a Volvo cab? I thought the MD was sticking with the Commercial Vehicles cab for now. Quite confusing for sure.
    • Mack guy Ata
      Question about thermodyne transmissions

      By Mack guy Ata · Posted

      - Mrsmackpaul thank you for the tips next time im doing aluminum welding i will make sure to follow these instructions. - vladislav this is amazing thank you very much. Yes this is the type of thermostat i need its great to have photos of it will make finding one much much much easier 

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    • TJ Lincoln

      TJ Lincoln  »  A Hobgood

      This is the current condition of my 47 EE project. The rebuilt EN271 is out and we are in the process of checking the fit of a big block Ford. It is the same truck that’s in my thumbnail photo taken a few years ago. I have managed to acquire all the new rubber cab seals and many are installed. I have a painless harness as well. 

      That engine and trans are on a pallet and probably weigh around 900. I believe the clutch is new and the trans was gone through. 
      Louisiana is a fair distance from the middle of Washington!
      That said, all the cab rubber body parts had to come from Massachusetts and it took over 3 grand for all the window, door, cowel, fender and more pieces to get everything. I found some parts back east but they are not cheap.  
       



      · 0 replies
    • mowerman

      mowerman  »  1Macktrk

      Hey, welcome my board and have a swinging time… bob
      · 0 replies
    • Lmackattack

      Lmackattack

      HO HO HO

      · 0 replies
    • the_IRFmack

      the_IRFmack

      - I double sticked and old Mack to feed a stone crusher in 12 and 14 hour shifts six days a week all summer to pay for my chemistry degree.
      - Because I wanted to sleep for 1 min and 26 seconds each trip out of the quarry at the crusher's vibratory dump box at the top the quarry during those 12 hour shifts, I bulled the old MACK up long 20 degree and sometimes steeper grades.
      - THAT meant that I split each gear 1, 2, 3 after coming out of boggy low.
      - All I did was rev to the right engine note, reach my left arm down through the steering wheel to hold the curve I was on or hold the truck's path steady; slip out of 1st, throw the 2nd stick high into low and slip into 2nd gear... rev to the right engine pitch, slip to high.
      - Then when it was time, reach through the wheel again, slip high to low and 2nd to 3rd {if I correctly remember 60 years ago}.
      - The Igneous rocks were too heavy and the grade too steep for me to ever get into 3rd high.
      - The crusher team were the mechanics for everything and had replaced the old Mack's tranny gears because they had been ground too much. - - They later told me they didn't believe me when I told them I slipped all my shifts because the gears showed no wear.
      - Except for start and stop; Not once did I use the clutch because that made my leg ache too much after an hour or so.
      - I slipped all my standard 4 speed shift vehicles all my life...just to be with the music of the engine and car or truck.
      · 0 replies
    • the_IRFmack

      the_IRFmack

      - I hardly ever change disc pads or brake shoes because I always slipped my gears downshifting...
      _ I learned that because the synchro rings got shot on my 1968 Volvo 122S 2-Door 4-Speed with an electric overdrive because I stupidly speed shifted and ruined them. https://bringatrailer.com/listing/1968-volvo-122s-17/
      - [Note: That Volvo's original owner was a Canadian Submarine Captain who rallied it and that is why it had Volvo's unique electric overdrive.]
       
      - {I clear coated over the bone white with Cadillac Firemist Green and painted the grills Black because they were dented...gosh it was stunning.}

      · 0 replies

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