I love this place... Exactly the discussion I was hoping for here. Thanks for the info.
As you can see from my sig, I'm not exactly high in the power range, but after seeing the torn up bracket in CobraR's other post, I figured I'd see if anyone else had problems. I understand the bolt (even grade 8) isn't really designed to take shear force, and it's tough to get much clamping force through the rubber. It does seem, at first thought, to be a usable crutch until poly or solid welded mounts are available. In the thread I found where Wynn made his poly-lined mount, he said he wasn't ready to make them for anyone, other than the one that went to Canada.
I love the way the Dennis R tranny shifts, especially with his chip, but I'm concerned about destroying the rest of the driveline. Rich at mn12 performance told me today that he's working on something for the rear mount, but it's not ready yet, and a Ford mechanic in the Memphis SVTOA was telling me that he's seen a few Cobras with broken rear covers, like racecougar's. I have a lot of miles on mine, so I figure it's due anyway, even though the car has never really seen any salt. I want to make sure the suspension is set up right before I get to the next stage, which is some intake work, the Mk 8 converter, and MM driveshaft, since the chip bumped up the shift points to higher than the stock torque converter is rated to. After seeing the shape the rear mount is in and noticing the new, higher shift points, I'm leery about going to the track again until I fix a few things.
97 LX, 4.6, Dynomax catback, Mustang MAF/intake tube and Aviator throttle body, Xcalibrator2 by Lonnie at BOC, 180 t-stat, Super Coupe wheels with 235/60/16's, Kenny Brown strut tower brace, Tokico Blues, Eibach Pro-kit, some strategically placed MN12 Performance polyurethane pieces, '02 Grand Marquis transmission
Submariners do it deeper...