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I'm pretty sure that mine are coarse thread, ½"-13 UNC. I used my big
cross-shaped 3/4" lug wrench to get them loose. Once I broke them free the
threads were in good shape. I am pretty sure that the bolts were original -
there was no evidence that the crossmember had been dropped before.
That was my first experience at dropping a pan in a 122 without pulling the engine.
The oil pipe seals had blown from overpressure (130 psi or more, the oil pressure gauge, 0-80 psi over a 270° swing, was pegged).
I agree that fine threads are probably not what you want there.
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George Downs, Bartlesville, Heart of the USA!
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