Metal Transmission Gears

The Wheely King slipper setup has been a thorn in the side of many that still run it. I appreciate the idea of the slipper because it stops me from destroying my drivetrain but it has no adjustment. Once it starts to slip the plastic teeth smooth out and it gets looser until it leaves you stranded or you glue it together and "lock" the transmission. So why not just lock the transmission? Several people have and some report stripped transmission gears. Until recently, you had 3 options: run the slipper, lock it and risk the gears, or get a new tranny. RC4WD came out with a metal transmission setup but I found the price to be a bit much and the setup was overly complex (adding to the price). Luckily, CKRC has released a metal transmission gear/slipper setup and I couldn't wait to get my hands on one.

PARTS & SUPPLIES NEEDED
Wheel bearing grease
CKRC Metal transmission gears

TOOLS
Phillips #2 Screwdriver
Dental pick
Allen wrench



1. The first thing I did was to remove my motor/tranny setup. It may be easier for you to completely remove your motor but I had plenty of slack in my wires and enough space to pull it all out as a unit. You'll have to remove the yokes for the driveshafts as well:


2. Using the phillips, remove the cover on the transmission:


3. Starting with the center set, remove the plastic gears. Using the dental pick, remove the E clip from the gear shaft and pull the gears off the shaft. Note that these are spring loaded so take great care to not lose parts:


4. Now you will need to slip the new metal gears and slipper assembly onto the shaft. At this point you'll need to decide if you want to lock this new slipper or leave it as is. I decided to not lock it, just so I could test and see if it would actually slip. If you want to lock it you'll need to install the small set screws included with the kit. I used a vice to help me lightly compress the gears enough to get it all together, then set it aside:


5. Here you can see the old and new side by side. Note that on the CKRC gears, one gear is larger and that will be important later:


6. Next remove the larger gear from the tranny and pull it off it's shaft. Note that there is a pin going through the shaft that you will need to reuse:


7. Slide the new gear on and make sure it goes over the cross pin:


8. Next you'll need to remove the spur gear assembly from the other side of the transmission. To do this you'll remove the spur gear set screw then the cross pin. That will allow the whole shaft to pull out:


9. Now remove the E clip and sleeve to slide the old gear off and install the new gear:


10. Installation is the reverse of removal but don't forget about that larger center gear. The larger gear must mate up with the smallest gear inside the tranny otherwise you will not have proper mesh. You can try it both ways and you'll see what I mean. I used a little wheel bearing grease to help keep the gears running smoothly:


11. After installation I went for a little test drive and everything seems to be working well. I'll make updates about the slipper as I see how it works.