[DeTomaso] Gumball pantera reverse shifting issues back again

[LEVITT1946 at aol.com]

Hello Friends,
Frustration has set in.....
 
I have a new master cylinder,new slave ,new speedbleeder valve on the slave 
 .
 
Yesterday I pulled the baby out of the garage after a long winter .The car  
shifted smoothly into reverse gear and off I went.
 
I drove approximately 15 miles at about 60mph and the car shifted thru  
1-2-3-4-5 with no issues. I took her up to 100mph for a few short bursts and 
all  was fine .
 
I pulled over into a parking lot and tried reverse gear . To my  
astonishment....NO REVERSE....Just grinding so I backed off .If I shut the  engine off 
I can shift into reverse and then start up and the ZF will go into  
reverse. 
 
I am running the ZF with Castrol Hypoid C  80/90W. 
 
I am open to any and all ideas at this point .
 
 
Regards,
Bob Levitt