I have the greenbook which gives all specs for 84-86 cars. It's at the shop but I believe only the NA m46 cars got the 3.31 rear end (which seems counter-intuitive) and the ZFs got the 3.73 or 3.91. I'll double check this evening.
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1985 744 D24T M46 49mm t3 @20psi 280k
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