History not on the side of Brady

Tom Brady’s 20-year tenure with the New England Patriots has come to an end.

And although it will be strange seeing the 42-year-old in a Tampa Bay Buccaneers jersey next season after reports say he is expected to sign a deal for about $30 million per year, Brady isn’t the first franchise quarterback switching teams late in his career.

He leaves New England as a six-time Super Bowl champion and three-time NFL MVP. He is second in NFL history in passing yards and touchdowns.

Below are other signal-callers who changed uniforms near the end of their career, leaving by either trade or free agency.

Not surprisingly, most struggled to replicate the same success with their new teams.

Joe Montana

The San Francisco 49ers were a dynasty in the 1980s, and Montana was the cornerstone piece. He led the team to four Super Bowl titles while winning two MVP awards during the decade.

Montana was 100-39 as a starter in 13 seasons with San Francisco, throwing for more than 3,000 yards and 25 touchdowns six times.

Nearing 40 years old, he spent the final two years of his career with the Kansas City Chiefs. Although he was 17-8 and led the team to two playoff appearances, his overall production slipped. Montana totaled 5,427 passing yards, 29 touchdowns and 16 interceptions over those two seasons, where he also was 2-2 in the playoffs.

Brett Favre

Favre was an icon in Green Bay for 16 seasons. Although he only won one Super Bowl with the Packers, the franchise reached the playoffs 11 times with him under center.

After a brief retirement, he played one season with the New York Jets in 2008, finishing with a 9-7 record. He then signed with the Minnesota Vikings at 40 years old. His first season was a success, throwing for more than 4,000 yards and leading the team to the NFC Championship, where the Vikings lost in overtime to the New Orleans Saints.

However, the Southern Miss alum had a difficult final season, throwing 11 touchdowns to 19 interceptions while going 5-8 in his 13 games as the starter.

Favre ranks fourth in NFL history in passing yards.

Johnny Unitas

Unitas won three NFL Championships and one Super Bowl in 1971 during his 17-year career with the Baltimore Colts. He also was a three-time MVP as one of the most dominate players in the league over nearly two decades.

However, Unitas began losing playing time to Earl Morrall later in his Colts tenure and was traded to the San Diego Chargers in 1973 at 40 years old. He played in just five games for the Chargers, throwing three touchdowns and seven interceptions before retiring the following season.

Peyton Manning

Winning a Super Bowl is never a bad way to end a career, although the longtime Indianapolis Colt played a minimal role in the Denver Broncos' championship run in 2015.

He became the only starting quarterback to win a Super Bowl with two different teams, although he struggled throughout his final season. He threw for under 225 yards in all three playoffs wins and totaled just two touchdowns -- this coming after throwing for nine scores to 17 picks in 10 games during the regular season.

After signing a five-year, $96 million deal with the Broncos in 2012, his first three seasons were a hit, including a record-setting 55 touchdowns passes in 2013. However, the league's No. 3 all-time leading passer and 14-time Pro Bowler will always be remembered as a Colt.

Warren Moon

After coming over from the Canadian Football League, Moon quickly developed a name for himself with the Houston Oilers. Although he wasn't always surrounded by great teams during his 10 years in Houston, he still was considered one of the game's top passers.

Moon was traded to the Minnesota Vikings in 1994 at 38 years old and could never duplicate his same production. He led the team to the playoffs in 1994 but went 12-12 as a starter over the next two seasons. He had a losing record in two seasons with the Seattle Seahawks before playing a backup role in Kansas City for two seasons.

Donovan McNabb

Although McNabb never won a Super Bowl, he had an impressive 11-year run with the Philadelphia Eagles, including four straight NFC Championship appearances from 2001-04.

But with the Eagles ready to hand the reigns over to Michael Vick in 2010, they traded McNabb to Washington. He went 5-8 as the starter for the Redskins before signing with the Vikings in 2011 at 35. He started 1-5 before being benched as the starter.

Joe Namath

"Broadway Joe" was the face of the New York Jets for 12 seasons, leading the franchise to its only Super Bowl title in 1969. Namath was struggling near the end of his Jets tenure, and he signed with the Los Angeles Rams in 1977 with hopes of his reviving his career. However, injuries had taken a toll, and he started just four games with the Rams, throwing for 606 yards, three touchdowns and five interceptions before getting benched. He retired after the season.

Randall Cunningham

The longtime Philadelphia Eagle is an example of finding success with a new franchise. He came out of retirement to join the Vikings and had the best season of his career in 1998.

He threw for a career-high 34 touchdowns and was 13-1 in 14 starts. He guided Minnesota to the NFC Championship but was just 2-4 the following season. He played in 12 more games over the next two seasons with the Dallas Cowboys and Baltimore Ravens.

Five of his 12 playoff starts came after he left Philadelphia, where he spent the first 11 years of his career.

Kurt Warner

Warner didn't play in the NFL until he was 28 but enjoyed immediate success. He went 35-8 in his first three years as the starter with the St. Louis Rams, winning the Super Bowl in 1999 before getting back there again in 2001.

His career quickly went downhill after that. Warner went 0-6 in 2002 before being replaced by Marc Bulger as the starter. He played one season with the New York Giants in 2004 before signing with the Arizona Cardinals the following season.

Warner struggled in his first few seasons in Arizona but had one of the best seasons of his career in 2008, throwing for 4,583 yards and 30 touchdowns while leading the team to the Super Bowl. He also went 10-5 the following season and won another playoff game, throwing five touchdowns in a 51-45 victory over the Packers.