1. in 79 they introduced a new trans top. they switched from the ratchet type to the "rotary" lid aka "maytag" lid, aka "cowpie" lid. they kinda suck but it's no reason to not buy the bike...shifting can be more sloppy but that can also be cleaned up with better bushings, etc.
2. no problems that i'm aware of.
3. nothing really to watch out for but 79 is also the year (or maybe it was 78?) that the motors went from 74" to 80" but if i'm not mistaken the fxe stayed 74" until the following year or maybe they made both in 79. i'm rambling...but check on that...no big deal but just one thing that changed around that time.
2. no problems that i'm aware of.
3. nothing really to watch out for but 79 is also the year (or maybe it was 78?) that the motors went from 74" to 80" but if i'm not mistaken the fxe stayed 74" until the following year or maybe they made both in 79. i'm rambling...but check on that...no big deal but just one thing that changed around that time.