42078 Mack Anthem Tri-Drive MOD

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Modification of 42078 A-Model: Mack Anthem truck with Tri-drive (tridem drive) rear axles instead of default tandem-drive.

We are seeing more and more tri-drive trucks are on the roads these days. Tri-drive tractors are useful in some situations as the extra axle only adds about $20,000 - $25,000 to the total cost of the truck. A heavy piece of equipment on a lowbed trailer being pulled with a tri-drive tractor does away with having to strip down the hauled machine to prevent being over loaded. The extra weight that the 7 axles allows in all comes close to B-train payloads without the bother of double-trailer configurations. However there are still issues with different provinces and states as whether you can run one of the types of trucks. Some states and provinces do allow them for their resource industries while other areas do not allow them period. http://www.tridrives.com/

So, please make sure that your state or province allows them before building!

Features
  • The change is 42078 Mack Anthem original model and other 42078-based trucks that share the same chassis.
  • Only real-half of a chassis is modified so any other modifications including RC adding are compatible.
  • All three rear axles are driven using an additional driveshaft: the 1st axle has a "direct-drive" like an original tandem-drive model, and 2nd+3rd are driven in a parallel for a better torque load balancing between the differentials. It's not a mandatory thing for "manual" model but highly needed for possible RC modifications.
  • As the fifth-wheel position is now deeper, it is not compatible with original A-Model's trailer or the similar ones with "back" kingpin position.

MOC's BOM contains only extra parts needed for this modification. MOC's Building Instructions contains only steps for modified steps. Please make sure that you have the original model, original building instruction and extra parts listed in the BOM below.
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MOC-27224

Name 42078 Mack Anthem Tri-Drive MOD
Designer VoidSerpent
Designed 2019
Inventory 101
Theme Technic > Model > Traffic
Modification of 42078-1 Mack Anthem
Central Perk
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Submitted by nigel1975 PRO Aug. 6, 2019
Double road-train, tri-drive & tandem dolly
Submitted by nigel1975 PRO Aug. 6, 2019
Tri-drive with flatbed trailer
Submitted by nigel1975 PRO Aug. 3, 2019
This is a quick MOD of CustomBricks.de Mack lowboy trailer where I have directly mounted the cargo bed to the deeper 5th wheel. Original features for lowering and detaching cargo bed are preserved. The Mack drives/steers really well in this configuration and of course all the weight is now directly on the tri-axles.
Submitted by nigel1975 PRO Aug. 3, 2019
Lowboy raised and ready for Mack to drive off.
Submitted by nigel1975 PRO Aug. 3, 2019
Lowboy lowered for detaching cargo bay.
Submitted by nigel1975 PRO Aug. 3, 2019
Lowboy detached and boom raised.
Submitted by nigel1975 PRO Aug. 3, 2019
The tri-drive version of the Mack is great. Drive and steering work flawlessly still (jb70's Mack MOC)
Submitted by nigel1975 PRO Aug. 3, 2019
Proportions are realistic.
Submitted by nigel1975 PRO Aug. 3, 2019
Deeper 5th wheel opens up options for lowboy trailer (working on this now)
Submitted by nigel1975 PRO Aug. 3, 2019
My own custom locker.