Drivetrain Transmission Trouble In My 93 5.0 5 Speed Tail Housing Cracks

[Bluestang93]

My 93 hatch 5.0 5 speed keeps cracking tailhouseings I've been through three now and I just cant figure out why

 

[Mustang5L5]

Driveshaft out of balance?


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[Bluestang93]

I'm not sure but I think so because there is a strong vibration at about 65-80 at any other speed it doesn't do that would that cause it to crack

 

[General karthief]

Jumping in here late but did you figuare it out? If not is the rear trans seal wasted or deformed? Is the driveshaft bottoming out or maybe not in far enough?