According to the staff of Conicelli Mitsubishi, all 1G cars produced before the second week of June, 1991, have 3-bolt rears. This essentially covers all 1990 and 1991 DSMs. All 1992-1994 cars have 4-bolt rears.
Many DSM owners are under the mistaken impression that the changeover between the original 3-bolt rear end and the stronger 4-bolt version occurred halfway through the 1992 model year. This is not so.
Those curious to know the production date for their car can check the driver's side doorjamb sticker. The acronym MDH stands for month, day and hour of production.
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