ORIGINAL: 46u
Keep in mind catbutt runs mostly on sand and is very hard on a vehicle. I do agree unless you are running a big block or an engine like the OS TZ that has as much HP as some big blocks keep the stock diff housings. Now if I read it correctly the new MT 2+ has better diff housings.
On the sand note, I just got hooked up with some guys who have built a track that is
not sand out in the decommissioned Fort Ord army base. The track is powder dirt and small gravel, but at least its not sand! It is also small, which would be OK but we just expanded the beach track this weekend to 10th scale size and it rocks. There are benefits to running on sand though, it's much softer to land on. Plays hell with the bearings, to be sure. I suppose I can just split my time between the two tracks, they each have their merits.
Now I have a question in the form of a problem. I have been having oil residue getting into my one-way bearing causing it to slip constantly, which has caused me to have to replace it once already. I have also replaced the backplate and output shaft due to the fact it had too much lateral play, causing (I believe) the first bearing to go. I did not notice the bearing slipping because I was using the Rotostart, I have since switched to a pull-start. Even with the new bearing, backplate and output shaft, I still get oil in the one-way. When I drive the car, after I shut it off it won't catch due to the oil in the bearing. I have to pull the rear end off, clean the bearing and backplate and reassemble everything in order to get the bearing to catch for re-start. Needless to say, this is getting old fast. What I need to know is /A: What is causing this /B: If anyone else running the OS 18 CV-RX is having this issue and /C: What can I due to remedy this? My car mechanic buddy says this problem is inherent to the design, the notch in the output shaft which fits onto the crankshaft makes the output shaft out-of-balance and at the high RPMs these engines pull causes vibration which wears the bushing and shaft- result, leaking engine oil down the shaft into the bearing. Now this may be true, but these items are brand new, only used a total of maybe 4 hours, I hope they don't wear that quickly. Any thoughts on this are greatly appreciated.