new to the mopar world ( tranny ?)

i recently traded for a 70 duster 340, it has a four speed in it, and i was wondering how can i tell witch it has? are all 4 speeds the A-833 or is there a 3 speed overdrive and how hard is it to put syncros. in it it grinds a little up shifting and down shifting worse when its cold.. thanks for any help you mite have
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