Another option that's Inexpensive, bolts right in and is a really nice performance upgrade is to get a transmission or all the parts from a HobbyPlus CR-24/CR-18/FMS ATLAS 6x6/RocHobby Katana V1 (red version)
And a skid plate from a HobbyPlus CR-24.
Swap over your 050 motor and now you essentially have a HobbyPlus CR-24 with a 050 motor and lots more gear reduction. This will give you slower crawling speed and more torque and it's an inexpensive bolt in solution. You could even take it further by using the Barrage 64t spur gear instead of the 54t sour gear from the new transmission. However to make it fit you'd need a 9t or 10t pinion preferably brass and you'll need to slot the motor mount holes downward so the motor rests completely on the skid plate. However, this will significantly increase the torque at the transmission so you may want to upgrade to metal u joints or whole metal driveshafts from the HobbyPlus CR-24 and make sure to not power through a bind or you'll break the smallest transmission gear. Supposedly mofo RC or someone was working on metal gears for the ATLAS 6x6 transmission which is the exact same as the Hobby Plus CR-24/CR-18 which would make it bulletproof.
I've attached a picture of the HobbyPlus transmission with a Barrage 64 spur gear instead of the HobbyPlus 54t spur, with the smaller pinion to make it all fit (don't forget to slot the motor mount holes.
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