If you’re already at 11.38; and you have the thing apart anyway; it’s probably a good time to upgrade. I don’t know what the limit is on a stock one; but it would cost a lot more to fix it later.
Bigger is better,however it will cost $300+/- to upgrade entire driveline to 1350 series.If your yoke slides on and off the splines on the new pinion easily,it is stretched or worn a little.It should require a gear puller to remove yoke.