After a shaky start and conceding an early goal we enjoyed long spells of possession against Sir Alex FergusonÃ¢â‚¬â„¢s men culminating in Jermaine JenasÃ¢â‚¬â„¢ wonderful equalising free-kick. Michael Carrick later hit the crossbar as the game ended in a 1-1 draw.
United now travel to the Lane for a 12.45pm kick-off on Monday and another vital game in our quest for fourth place.
"WeÃ¢â‚¬â„¢ve been tough to beat all season and that game at Old Trafford underlined it," recalled Ledley, who is rated doubtful for Monday with a foot injury sustained in Saturday's 1-0 win at Everton.
"We went to Old Trafford and not too many people outside the club would have expected us to get anything from the game.
"We didnÃ¢â‚¬â„¢t make the best of starts and conceded early but after that we played really well and you couldnÃ¢â‚¬â„¢t really tell any difference between the teams.
"It showed at that stage how far weÃ¢â‚¬â„¢d come and weÃ¢â‚¬â„¢ve maintained that all season. Now we want to finish it off."
United arrive at the Lane having just seen a run of nine successive victories ended with a shock draw against Sunderland.
With Chelsea winning at Bolton, the title looks all-but over but Ledley still expects a huge test.
"United are flying and playing very well but we got a good result at Old Trafford and we are not scared of them in any way," added Ledley.
"We know they have some great players but we believe we can win any game at home, and that includes Manchester United."
Meanwhile, full-back Lee Young-Pyo admits he is relishing the challenge of coming up against his South Korean team-mate Ji-Sung Park.
"I have known Ji-Sung for a long time now, we have played together quite a few times," said Young-Pyo. "He plays left-wing, I play left-back so we know each otherÃ¢â‚¬â„¢s game in a lot of detail.
"He is a good player for United, another that works very hard for the team and he is in good form, especially after his goal against Arsenal. I hope he has a good game today and plays well, but we win the match Ã¢â‚¬â€œ that would be perfect!"
PLEASE NOTE: Our Whites suite, situated on Paxton Road, will be closed on Monday for our match against Manchester United as this is a category A fixture.
Ledley King feels our performance against United at Old Trafford back in October helped instil the confidence that has seen us maintain fourth place in the Premiership for much of the season.