Take it off a huge jump and flat land it....if it breaks it is a Durablue. Lol If it bends...LSR. If it stays straight as a arrow then you know what make it is.
How wide is the axle? It could be Oem with an aftermarket sprocket hub.If I am not mistaken the splines on the sprocket hub on all durablue axle are proprietary. Meaning only durablue sprocket hubs will fit durablue axles. So that might be a way to eliminate durablue.