axle keeps coming out .
 

Just put a new axle since the other one messed up , and now this one is starting to shake again , its doing exactly the same thing before the last one poped out of the tranny . Why is it constantly sliding out ?

You sure you jammed them all the way in there?

Yea it was flush with tranny , the gap is paper thin .

Is the spline the same? I believe all b-series axles are the same, maybe you got a wrong axle or defect? Also, which side?

Passenger side, and it the right 1. The one that poped out the first time was an aftermarket that I put in 2yrs ago ,replaced both axles because the driver side was knocking.still had both originals laying around so I put back the original one from the passenger side