I have a 1976 3/4 ton frame with a sb 400 motor 350tran. and 203 transfer case. I just installed new trans. mounts and know my balancer hits the frame crossmember when I'm on the throttle hard or have it flexed hard. I looked at a mid 80's blazer with a 400 motor and there was about an inch of clearance there. GM must have changed something in this area? or I've got something wrong? I put spacers between the transmission crossmember and the frame to lift the front of my motor and it helped but I still only have about an 1/8" gap. Anybody have any ideas?