Make sure all the parts are super clean.
Inspect every part, especially all the gears. Replace anything that is suspect.
make sure the passages down the center of the shafts have no debris and make sure all the little hole in the shafts are clear.
Replace the bearings in 3,4,5 with the bearings from the 06 SI (psst... they are better)
Also, I have a 1st and second gear set available.