Broken trans mounts TKO600

[GT427]

This is a high hp small block, 3900lb.

Got a bad vibration and when I checked things out found the the mounting tabs broken off the gearbox casing.

Would making a solid mount for the gearbox be a fix for this?

Any possible causes I need to look at?

[Geezer]

What are you using for the engine mounts?
Before I tied the trans solid, I'd go further into finding what else may be wrong.

[Supershafts]

If the motor isn't held solidly do not hold the trans solidly, and even then id use a mount..

Id be more interested in how that happened, any vibrations prior to that major vibe, misalignment maybe ?

[af2]

If the engine is on a plate you need a rubber or whatever mount on the trans to compensate for twist or whatever is happening. solid and solid does not work.