Our ABEC Grade 7 Ceramic bearings in a set just for TC3/TC4   Twenty (20) bearings total.   $65.00
Here is what you get: 
12 each 3/16 x 3/8 (input shafts, steering blocks, hub carriers, outdrives)
4 each 3/16 x 5/16 (diff)
4 each 3/8 x 5/8 (outdrives)