Overkill
Well-known member
This is the only part that Arrma makes thicker than Tekno. The Tekno shafts are 3.8mm diameter and the Arrmas are 5mm. The Arrmas are 2.5mm longer and you must use the Arrma stub axles because the ball end is larger and doesn't fit in the Tekno stub axle. FYI, Arrma uses good quality hardened steel.
Beefy
Size comparison
5mm vs 3.8mm
Custom steel rings
Covers the pin
In the hub
Drilled out to 3mm in order to use Tekno hexes and pins
2mm thick shim goes right in front of the inner bearing
The shim pushes the driveshaft further inside the outdrive for the correct position
M2C delrin shock cap bushings with the built in flange/collar which spaces the shock/spring out just a tiny bit
The bushings create more clearance so there's no rubbing
- Remove the 13x19x4 bearing from the inner part of the hub and instead use a 8x16x5 bearing further inside the hub like you would when using the Tekno universals, so now you're using two 8x16x5 bearings. The driveshaft has moved further inside therefore making the other end of the dog bone in the correct position inside the outdrive, perfect!
- I had some custom steel rings made that slide over the stub axle pin. The pin has nowhere to go but I don't want it moving around.
- Place a 2mm thick shim in front of the inner bearing to get the dog bone further in the outdrive. This will put it in the same exact position as a stock Tekno dog bone.
- The pin on the hex side of the Arrma stub axle is 2.5mm and Tekno uses 3mm. I definitely want to use the Tekno hexes and pins, so I drilled out the hole.
- On one side of the truck I'm using a 0.3mm shim right behind the hex, the other side has no shims.
- I used the M2C delrin shock cap bushings on the front which have a flange/collar on them that spaces the shocks/springs out just a tiny bit, giving the thicker driveshafts adequate clearance so they don't rub on the spring. The rear driveshafts have plenty of clearance.
Beefy
Size comparison
5mm vs 3.8mm
Custom steel rings
Covers the pin
In the hub
Drilled out to 3mm in order to use Tekno hexes and pins
2mm thick shim goes right in front of the inner bearing
The shim pushes the driveshaft further inside the outdrive for the correct position
M2C delrin shock cap bushings with the built in flange/collar which spaces the shock/spring out just a tiny bit
The bushings create more clearance so there's no rubbing
Attachments
Last edited: