Is the roll out the same for 13.5 & 19t motors?

No, try starting out .50 to 1.0 higher in rollout.

LOLOLOL

if you ran a 2.40 roll out in 19 turn

try a 3.40 roll out in 13.5

Thanks for the help one more question on the kimbro gears the diff balls are not in the middle of the ring.Is this ok or do I need differant gears or rings?

As for the diff ablls I keep mine in the outer hole in the spur. I did meet a racer that used them in every hole for more friction.

So I do have the right rings and gears and after a night of research it looks like I need to rebuild my diff and get back to the track for some more testing. Thanks everyone for the help