Simon Murray made it four goals in five games with a deadly double to send Arbroath into a play-off showdown with Queen’s Park on a high.
Murray netted a second half brace, after Bobby Linn had put the hosts ahead, with Thomas Grant and Ricky Little sealing the win against ten-man Berwick with late strikes.
It was the perfect boost for Todd Lumsden - who took charge of Red Lichties for the first time since taking on the manager’s job on a permanent basis.
But it was Berwick who took the initiative early on with Arbroath number one, Marc McCallum by far the busiest keeper.
McCallum showed superb reflexes on 21 minutes to beat away a Paul Willis effort.
He then watched on in relief as Kyle Wilkie’s 25-yard strike went inches over.
With the blustery conditions wreaking havoc with the game, chances were few and far between, and Arbroath failed to force a single save out of Rangers number one, Michael Andrews in the opening half.
Kieran Stewart had their only real chance of the first 45, meeting a Jordan Lowdon cross to send a looping header wide.
Lumsden’s men were far better after the break and took just seven second half minutes to make the breakthrough.
Murray won the ball in midfield and his long through-ball was controlled by Linn who rounded keeper Andrews to strike into an empty net.
Linn then turned provider for the second goal, on 58 minutes, as Murray met his cross to bullet home a header.
Murray made it 3-0, nine minutes later, as he raced onto a Dylan Carreiro lobbed pass to drill beyond Andrews from ten yards.
The visitors had skipper Stephen Tulloch sent off on 84 minutes for a last man challenge on Kevin Buchan.
Sub Grant curled home the resultant free-kick and Little’s wind-assisted effort from almost the halfway line was dropped into the net by Andrews to make it 5-0.