Mike, Do you have any pictures of the launch? Is the Left side comming up way higher than the Right? Where that tranny is broken, I would think that is from the frame twisting...Left mount goes up, Right mount goes down & trans mount is stuck in the middle.
Are planning to do a rollbar/cage? Are truck frames as far as twist goes goes, is pretty bad. I have a plan for a real slick anti-roll bar, but I'm not sure without some frame stiffening that it will work all that well, most likely just twist between the anti-roll bar & the engine area. The ultra bell should fix you up. Another option if this continues to be a problem would be to go to a mid-plate, the combination of the engine & frame attached there seems to help each other.
My friend has a high 9 second '68 Camaro with a stock subframe (does have connectors & a 10 pt. cage). He broke a block up the lifter valley & a transmission that looked just like yours. This was with solid mounts & a urethane tranny mount...adding a mid-plate seems to have stopped the problems, the last couple years have been pretty good to him. My Two Cents, Lorne
1
