The, Wilcox opted to sign with the more established 49ers where he went on to star for 11 seasons. Converted to outside linebacker, Wilcox quickly established himself as one of the league’s finest. Nicknamed "The Intimidator," he was ideally suited for the position, both mentally and physically. Known for his ability to disrupt plays, he was particularly tough on tight ends. He did not let anybody easily off the line of scrimmage whether to block or get into a pass route. Always prepared, Wilcox was a true student of the game and worked to be fundamentally correct. During the 1964–1974 span, the 49ers had a winning record in four seasons, and made the playoffs in three consecutive seasons under head coach Dick Nolan. In 1970, San Francisco won the NFC West division title with a win-lost-tie record of In a divisional game of the 1970 NFL Playoffs, San Francisco defeated the Minnesota Vikings holding them to 124 net passing yards and 117 yards rushing. However, they lost the NFC championship game to the Dallas Cowboys. In 1971, the 49ers had a particularly good year on defense, allowing only 216 points, 6th least in the NFL, and won the NFC West with a record of 9-5. They won their divisional game of the 1971 NFL Playoffs over the Washington Redskins, allowing only 99 yards rushing and 93 net passing yards, but again lost the NFC championship game to Dallas. In 1972, San Francisco won the NFC West for the third straight year with a record of 8-5-1, allowing on defense 249 points, 9th in the league. But they lost their divisional game of the 1972 NFL Playoffs to Dallas, thus eliminated by the Cowboys three consecutive years. In those three years, Wilcox at left side linebacker formed a strong tandem with middle linebacker Frank Nunley and right linebacker Skip Vanderbundt. He thrived on action and wanted it all directed his way. "What I do best," Wilcox once stated, "is not let people block me. I just hate to be blocked." Hall of Fame linebacker Joe Schmidt was impressed by his strength. "He gave us fits," he remarked. "The lead block had to really come out hard to take him out because he was so strong." Aided by his speed and long reach, he was also effective in pass coverage and managed to intercept 14 passes during his career. Following each season, San Francisco would rate their players based on their performance. The typical score for a linebacker was 750. Wilcox’s score in 1973 was 1,306. That season the veteran linebacker recorded 104 solo tackles, four forced fumbles, and tackled opposing ball carriers for a loss 13 times. Durable, Wilcox missed only one game during his career due to injury. Four times he was named All-NFL by the AP and two times All-NFC. He was also selected to play in seven Pro Bowls.
