Lost reverse, need help finding it. 727

Cleared it out.





The billet ones are best, and will keep that from ever happening again.
Check A&A transmissions online.
These steel Super Servo's are nice also.
Dodge A727 A518 46RH 46RE Transmission Low Reverse Super Servo Billet K029 | eBay
Trailbeast have you installed one of the super servos?
I can't seem to get the seal to slide past the retaining ring groove. Without the seal it slides right in.
I don't see how its even going to slide in with the stabilizing ring on it.
Any suggestions?
First I tried living it with transmission fluid, then I tried petolum jelly, as stated in one of the rebuild videos.