TRX-4M metal axle upgrade

Here is how to modify alloy axle cases so they can contain automotive gear oil. Maintenance-free crawling from now on, as this is "fit and forget". For real!
Buy all your RC upgrade parts here: upgraderc.be/?ref=rcwb110
Enter the Coupon Code RCWB110 and get 5% off!
You're welcome!

[@mehimrc1314]

I honestly thought you drill a grub screw top and bottom of the axle for oil changes, well that could be next I guess if it all holds up well.