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Is it a 2wd or a 4wd trans? I happen to know where a 2wd M5OD is but it is in Missouri, quite a distance from the WY border, and that trans has 180,000 miles on it from behind a 94 300.
Well you can still find a tranny. 302's with 5spds, 300's with 5 spds, and 351's with 5spds will all work in your truck. The 351s with a 5spd were likely to have the ZF which was a sturdier trans than the M5OD, and is a complete bolt in in 4WD form.