On Front Drivetrain can't get passanger side cv axel back in the rotor assembly what could the problem be

See if this helps:

1. Install outboard joint in knuckle; then, loosely install a new spindle nut.

2. Insert inboard end of driveshaft into differential, until set ring locks in groove. Ensure inboard joint bottoms into differential and that set ring locks into groove of side gear.

3. Install damper fork over driveshaft and onto lower arm. Install damper in damper fork, so aligning tab is aligned with the slot in damper fork.

4. Loosely install damper pinch bolt, and a new damper fork nut with the bolt. The bolts and nut should be tightened with vehicle's weight on the damper. See Step 8, below.

5. Install knuckle on lower arm. Tighten castle nut (50 to 60 N-m or 36 to 43 lb-ft) and install a new cotter pin. Torque the castle nut to the lower torque specification; then, tighten it only far enough to align slot with pin hole. Do not align nut by loosening.

6. Tighten new spindle nut (185 N-m or 134 lb-ft). After tightening, use a drift to stake spindle nut shoulder against driveshaft.

7. Install front wheels (110 N-m or 80 lb-ft).

8. Tighten damper pinch bolt and new damper fork nut. Tighten damper pinch bolt to 44 N-m or 32 lb-ft. Tighten damper fork nut to 65 N-m or 47 lb-ft.

9. Refill transaxle, if necessary, with recommended fluid.

10. Check front wheel alighment and adjust, if necessary.