Peterbilt 379 Semi Truck 1:18 in yellow and black (Obsolete)




In 2016 this Peterbilt 379 went to the body shop to undergo a complete make over. The updated "version 2" is 2 studs longer and has various cosmetic and mechanical updates.

The updated parts list is here

The parts list below is for the original version.

A 1:18 scale custom Peterbilt 379 Lego Semi-Truck in yellow and black. Powerfunctions dual XL-motors for drive, Servo Steering, M-motor attached to PF switch for remote controlled headlights, roof lights, tail lights, and trailer light attachment, M-motor for raising and lowering the third axle.

I made this Peterbilt truck yellow and black to go with the lowboy trailer used to carry the 42030 Volvo L350F as well as a modified 8043 excavator. I also wanted a liftable third axle to make it a bit unique from other Peterbilt trucks.

The steering, drive train, remotely liftable third axle, suspension, and most of the cabin is all my own original concoction. The truck has a PF switch driven by an M-motor similar to what is found in Madoca's wing-body truck which is used to control the headlights, roof lights, tail lights, and an electrical connection allowing the trailer's tail-lights to use the same light switch. Originally, the truck also had a 2 speed gear box which was manually operated and accessible from underneath. The gearbox design was very similar to Madoca's SUV Mk II. I've since replaced the gear box with a straight 1:1 drive because, although very zippy in the faster gear, the torque of the two XL-motors resulted in a few too many false neutrals. Elements of the hood, cabin, and sleeper were incorporated from various designs available from BricksOnWheels trucks and Sariel's kenworth Road train.

I originally built this with alot of Chrome pieces. The instructions here replace most of the chrome with either light blue gray or dark blue gray.

Probably the most challenging part of the build is getting all of the PF wires neatly tucked away. The trick is to stuff as much of each cable beneath the hood area and not in the sleeper cabin area, so as to leave more room to tuck in the battery all the way into the sleeper cabin.
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Name Peterbilt 379 Semi Truck 1:18 in yellow and black (Obsolete)
Designer motomatt
Designed 2015
Inventory 1674
Theme Technic


  • 2 years, 3 months ago el.paso (66)
    i have problems wirh the part on side 28 in the instruction peterbuilt379_v2.  The part is to wide so that i can't po together the two yellow sides like on page 86. I have built the black saddle like it is in the instrction. Do you know where the mistake is?
    • 2 years, 3 months ago motomatt (5K) MOC Designer
      I'm sorry I'm not clear as to what part is too wide.  Are you referring to mounting the fifth wheel onto the frame.
  • 3 years, 9 months ago Karle (438)
    I just finished the model. I added a pair of 42003 axle and pin connectors secured with 43093 pins to the forward end of the steering arms to stabilize them. Over all a very nice model
  • 3 years, 9 months ago jimgag2395_2 (1260)
    I'm getting excited. I've purchased 98% of the pieces I was missing. I'm a little confused on 2 of the parts listed here on Rebrickable.... 58123a and 58123b. If it's not too much trouble could you please tell me what the corresponding BrickLink number is? I keep coming up with 58123c01 there for both of them. Is there that much difference between the two as well? Thanks!! I'm really looking forward to building it.

    I've also bought the instructions for Ingemar's Lowboy Trailer to use with the 379.
  • 3 years, 9 months ago jimgag2395_2 (1260)
    The best looking truck MOC IMO. Love the lines and flow. Awesome. I've just imported the parts list into BL from RB and downloaded the instructions. Thanks for making such an exquisite MOC available. I would have gladly paid for it. Let the fun begin :)
    • 3 years, 9 months ago motomatt (5K) MOC Designer
      Thanks you're too kind. I just made a Peterbilt daycab but havent published it on here yet. You can check out pics and instructions at
      It fixes the camber of the front wheels as well as occasional slippage of the rear drive axles out of the rear differential. There are a bunch of aesthetic improvements as well, including the interior.
      • 3 years, 9 months ago Kalps1811 (2K)
        Looks awesome motomatt can't wait to see your next moc
      • 3 years, 9 months ago jimgag2395_2 (1260)
        Your welcome. You deserve the praise. The 389 looks great. Thanks for informing me of it but I'm going to stay with the 379. I like the tri-axle a lot. Looks menacing ;) I have Hans' drawbar trailer. I'm not a whiz at mods but I'll try to see if I can get it to attach to the 379. Could you advise if I'll be wasting my time? Thanks!!
        • 3 years, 9 months ago motomatt (5K) MOC Designer
          I'm sure you can attach any trailer, since it is lego... you may need to make an adapter and adjust for height but it should be simple :-) My fifth wheel design assumes that the trailer has a vertically oriented pin or axle which you just drop into the fifth wheel from above.
          The biggest challenge when building the 379 or 389 is probably to neatly fit all of the electrical wires into tight spaces.
  • 4 years, 7 months ago NovaofPain (10)
    What a beautiful truck, i'm gonna order the parts to build him. But i have some questions about it.
    The remote controls, which one or what do i have to order to make it complete. Not a lot experience with the controls. Just started to build technic after many years ;)
    And for the connection to the trailer, do you make your one connection with the rubber elastics, which elastics do i need for that?

    Please hear from you ;)
    • 4 years, 7 months ago motomatt (5K) MOC Designer
      I recommend at least one variable speed remote control for the steering and power.
      You would probably break it more quickly using an 8885 remote control since the truck makes alot of power with 2 XL motors. I connected two 8879 remotes with one 8885 remote to control all my vehicles. Also, you probably don't need a V2 IR receiver. I run both XL motors off a regular IR receiver and it's fine. You could even run the truck with just 1 XL motor for nearly the same performance in most cases, and more battery life.

      Since many of the parts are not technic, If you're familiar with building just Technic only, you will find that the truck is generally more fragile than a technic-only build, which could lead to some frustrations if you're not used to it. You just need to be more delicate when you assemble and carry it.

      I used to use a fifth wheel based on Ingmar's rubber band aided design. Now I use one without any rubber bands (as per the instructions) because it's more durable and looks better. It can still work to remotely couple a trailer using a 3L axle as the joiner, although I usually use a frictionless pin.
  • 4 years, 7 months ago motomatt (5K) MOC Designer
    Thanks hoogie.
    At frist glance, the trailer looks close to Ingmar's (2LegoOrNot2Lego) lowboy.

    I originally built Ingmar's lowboy trailer but then I build a second one from scratch according to my own likings, while still retaining Ingmar's detachable gooseneck design and his liftable rear axle. The trailer the truck is towing is my own custom one.
  • 4 years, 7 months ago hoogie35 (1106)
    where can I find the trailer? is this an existing one?
  • 4 years, 7 months ago hoogie35 (1106)
    nice truck, will try sometime.
    I miss the 2 remote controls in the parts list?
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