I am not an experienced racer - but here's my 2 cents on alum knuckles for the TC3.
I have the Jet knuckles for the TC3 and they seem very nice, except the bearings fit VERY tight.
I also have the JT Racing knuckles for the TC3, and the bearings in those fit tight as well.
My concern with the JT Racing knuckles is, they don't have that ridge in the middle that prevents the bearings from being pushed clear through. They won't fall out because the pin through the drive shaft holds them, but I've noticed that outer bearing will slide in a little (just a mm) and then the pin will rub on the knuckle...
Does anyone know of any other manufacturer that makes aluminum knuckles for the TC3 that are Silver in color?