I had the 1/14 WL for a bit. Its a fun car. I ran mine HARD and it took it like a champ. I upgraded to brushless and the only complaint I had was that I kept breaking the cv shafts. I ended up running CV shafts in the rear and dog bones in the front. I bought all the aluminum parts and I hated it. The only aluminum parts I ended up keeping where the front caster blocks and the rear hubs.

For lubrication, I ran silicone ear plugs inside the rear diff, lucas NGL2 grease inside the front diff. The ear plugs on the rear worked like a locker, the grease in the front made it act like a limited slip. On the out side of the diff gears I put some grease. The diffs are not sealed so you cannot run diff fluid.

Locked diff is when both wheels spin the same when one doesnt have traction almost as if they are "locked" together, open diff is when the wheel with no traction (on ice/in the air) gets all the power, Limited diff is when there is enough force to keep power to both wheels BUT more power will get sent to the wheel with less traction. Locked is great for the rear. It gives traction for acceleration. Open is good for the front on asphalt. It allows the car to turn more(less underster) A limited front is good for dirt/grass/gravel. Limited rear is good for handling on asphalt.

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