I have a fresh A-999 behind a 450HP 390 Stroker and it works great..... Well, that is after the first trans had the input shaft snap in half
But I think there was a factory defect in the first shaft but I had everthing freshened and it works good with my rowdy little 390...... TBF

71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!