Muggy diffs in a maxx

[Emaxx_Quebec]

With the agreement of “IT’S Me“ I post my step by step process to make this mod.

1: It will be cheaper if you have already:
- Center dog bone.
- 4 old and unused drive shafts. (replace 1/8 diff output shaft )

2: It cost me (include shipping cost to Canada):

- 2 x LST 2 diff = $43 us ( 43/13)
- 4 x 1/8 diff output shaft + 2 x Drive cup - 8mm bore for 1/8 diff = $50 us
- 1 Dog Bone center kit from Kershaw = $ 55
- Bow ½ pvc (Fem to Fem) + 1” join = $0.50

First, I cleaned the diffs and put Gorilla Swat in it and change the 4 diffs output.


When I put them back together and tighten the ring to the cup, it was impossible to turn the diff by hands.



I noticed that the RC monster output was a little bit too long so I had to shave them to the appropriate length. Once shaved the diffs output, it worked perfectly!!

[Emaxx_Quebec]

Next, plastic trimming can get started. It’s better to do it slowly to not take too much material at a time. I used this dremel bit to do all the work.


I hope the pictures talk by themselves.
A lot of small adjustments is needed to achieve a perfect fit.

[Emaxx_Quebec]

Then I had to shave the drive shafts a little bit too. After that, it was A LOT easier to install the pins.



finished with RCM 8mm Drive cup - Kershaw dog bone



I have a Ofne 51t mod1 spur 20t pinion with Bidpruduct 36/74 8xl 2075KV Motor with 43/13 diff ratio,
Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.7222222222222223
Other Ratio: 1
Spur Tooth Count: 51
Pinion Tooth Count: 20
Total Voltage: 14.8
Motor KV: 2083
Tire Diameter (inches): 5.8
Tire Ballooning (inches): 0
Motor Current Draw: 83
Motor coil Ω: 0.0084
Spur/Pinion Ratio: 2.55 : 1
Total Ratio: 14.52628 : 1
Tire Circumference (inches): 18.22 inches (462.82 mm)
Total Motor Speed: 29376.13 RPM
Vehicle Speed: 34.89 mph (56.05 km/h)
Effective KV Value: 1984.87
KT constant: 0.65 oz-in/A
Motor Torque: 0.28 ft-lbs
Final Torque: 4.08 ft-lbs
Final Power: 1228.4 watts (1.6 HP)


ps: I'm french speaking so my english is not perfect.

[SnoopMaxx]

That looks very good I am definitely doing that when my stock 3906 diff gives up