Would a daiwa lexa 400 fit on a Fenwick elite tech bass series rod. I've heard the lexa 400 is pretty big and different reels can't fit sometimes.

For bass, a Lexa 400 is way too big. Maybe for big muskies or saltwater fishing, but its a big reel.

You'd have to put that on a predator series rod, that reel is too big for even flipping with heavy line, almost a saltwater reel.