FIRST half strikes from Scott Agnew and Ross Lyon ensured Stranraer will be playing League One football - at the very least - next season.
The Blues came into the tie with a 15 point advantage over bottom side Queen's Park with five games left to play.
It would have taken an unheralded set of results to see Stevie Farrell's men finish bottom but any chance of that was extinguished in 32 minutes.
Kyle Turner was back from suspension but Paul Woods was sidelined through injury, along with David Barron, Angus Beith, Cameron Elliott and Ryan Thomson.
Farrell's preparations were hampered further by an injury to Cameron MacPherson in the warm-up, with Lyon promoted from the bench, which was home to goalkeeping coach Eric Phillips - surely one of the most experienced players on the bench in recent years.
Grant Anderson had already come close in the opening 30 seconds before the deadlock was broken after just six minutes.
Stephen Okoh did well down the right before finding Turner, who in turn found Agnew on the edge of the box.
The midfielder took aim and found the bottom corner of the net, making him the club's leading scorer for the season.
Turner very nearly claimed a second assist moments later after a superb bit of play.
He collected the ball on the halfway line facing his own goal before skipping round a defender and curling a ball through the Forfar defence.
Okoh collected the pass but could only lift his shot off over the bar under pressure.
Forfar were creating chances though with Dylan Easton curling over the bar before Dale Hilson fired at Max Currie from the edge of the box.
Their chances of getting back into the tie suffered a blow though as the Blues doubled their lead.
Lyon did well to collect a crossfield pass and attempted to curl a shot from the right of the box to the opposite corner.
That was until the unfortunate Michael Travis intervened but only managed to divert the ball beyond McCallum.
A 2-0 lead has been a precarious one in recent games involving Stranraer and it certainly gave no indication as to where the points would be heading.
Forfar came out after the interval knowing they would likely need to get back into the tie quickly.
And they came within a whisker of doing that as Easton cracked the crossbar from 25 yards.
Currie was helpless on that occasion but the goalkeeper picked himself up to deny Murray MacKintosh on the follow-up.
Ex-Livingston man Easton looked the main threat for the visitors and he again forced Currie into a save on the hour-mark.
Still, as time ticked by, the Blues seemed to be edging towards their second win in a row.
Morgyn Neill, who was solid at the back, almost headed home at the other end as Stranraer finished the game strongly.
Okoh was denied with five minutes left and Turner poked the rebound over before substitute Dylan Dykes turned and fired over in stoppage time.
It was an impressive result for the Blues, who kept their play-off hopes alive while yet again missing players from the first team squad.
Stranraer: Currie, Robertson, McGowan, Hamill, Neill, Hawkshaw, Agnew, Lyon (Gray 84), Turner, Anderson (Scott 78), Okoh (Dykes 89).
Not used: Phillips.
Forfar Athletic: McCallum, Bain, Whyte, Malone, Travis, McNaughton (Hurst 35), MacKintosh, Dingwall (Peters 85), Hilson, Easton, Aitken (MacIver 69).
Not used: Brotherston, Allan, Starkey and Adam.
Referee: David Munro