helps. My Forza is our ''experimental'' car. I also have a Losi 810, OFNA Hyper 7, and Savage X 4.6 (arriving tomorrow). In the seven months I've been into ''the hobby'', I've learned wrenching is my favorite aspect and love to rebuild and keep all components like new!
See our YouTube channel (link below) for a taste of the types of maintenance my 11-year old son and I employ in our rides.
Before getting into any of the ''intimidating'' aspects of maintenance (engine cleaning, transmission rebuild, differential maintenance, etc)Β*our protocol is toΒ*try it first try it on our Forza so as to learn from our mistakes - as they always happen - due to the fact I don't run the Forza much and have patience for it being benched while we learn.
Consequently, it's great to have a car such as this to learn from, and consultation such as yours on the diff rebuild is very much appreciated!
I have to rebuild the transmission on our Forza (again), Β*asΒ*it has the same symptoms as the OP (the one-way bearingΒ*on the first-speed spur gear is acting up). There is not much intel available to the masses on differential maintenance for these parts, and your expertise on these parts is quite rare (for a non Redcat/Exceed employee). ;-)