Is your engine rebuilt and fully balanced? If so, and the machine shop balanced it by drilling the flywheel, you might have problems. If it is stock and newer than '81 you will need a flywheel with a 50oz imbalance. Older 302's used a 28.2 imbalance. I think a lighter flywheel is a big advantage in the mustangs. The only problem is the price! As for the auto and manual having the same part number, sounds like something is wrong there.
andy
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88 coupe
91 LX NMRA Pure Street 5120
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