IntroThis is my take on a long standing, proven, and (somewhat) widely known modification that can be done to Traxxas Maxx trucks to improve and (nearly) bulletproof the drivetrain. Outfitting a Maxx truck with Losi LST differentials and driveshafts is nothing new, but I feel I have some insight that may help others who do this mod themselves. I take no credit for developing this modification; I just want to share my personal experiences with it.
Part 1: Why?
There are many advantages to doing a modification like this. I will run through a couple. The first one is strength. Big brushless systems of today paired with high power lipo setups can overpower even the newer 3.3 spec Maxx drivetrains. The Losi differentials have beefy 8mm inputs and aluminum cases standard. They also feature one piece hardened steel outdrives. The CVD style driveshafts also feature a giant 8mm axle. The stock Traxxas shafts and diffs have 6mm axles and inputs/outdrives. This can be done for around $80-100 depending on what parts you need and what kind of pricing is available at the time. For this price, you will get a lot of beef.
Part 2: Differential installation
I will begin with talking about how I installed my diffs. The problem with the Losi diff lies in the fact that the case is slightly narrower than stock and does not feature a stepped area around the outdrives like the Traxxas ones do. In order to compensate for this, an adapter must be made. The diameter of the collar that goes on the front of the Traxxas diff is also too small to fit the Losi.
I chose to draw up a collar that would allow the diffs to mount in the bulkhead on CAD and use the 3D printer at my school to make a set of four. I may explore making aluminum ones if the plastic ones fail. I have also seen adapters made from plumbing parts.
This was the result:
I then used a high speed cutter bit on my Dremel to enlarge the diameter of the diff collar
I also had to cut a relief in the sides of the collar to allow it to fit over the diff case
This let me get the perfect fit
I was then able to fit the diff perfectly in the bulks
Much more to come as I install the driveshafts, center shafts, and axle carriers.