IRVING, TEX., NOV. 3 -- That noted party animal, Chicago Bears Coach Mike Ditka, apparently overdid it a bit in celebrating Sunday's victory over Kansas City.

Ditka's speech was slurred during "Bears Extra," a Sunday night TV show hosted by former teammate Johnny Morris, longtime sportscaster for the CBS affiliate in Chicago. The Chicago Sun-Times today ran a picture of Ditka, head hanging, his body leaning heavily against the table before him.

The newspaper said Ditka "warmed up" with a little champagne and song at an exclusive Chicago restaurant and also reported Ditka's "slurred speech, singsong delivery and heavy eyes" had left the city abuzz. Local talk shows and local television stations could barely handle all the calls from viewers.

Morris, a wide receiver with the Bears when Ditka was an all-pro tight end in the mid-1960s, said he thought Ditka's speech might have been slurred, but said he didn't think Ditka was drunk and so decided to air the show that had been taped three hours earlier. "I thought most of the things he said made sense," Morris said.

Ditka, asked if he had been drinking or was just tired, first shot back, "What was wrong with it?"

Then he said, "Yeah, that's it, I was tired. I feel asleep and just couldn't get back with it."

The Bears' front office members, a stiff-shirt crowd to begin with, might not see the humor in it, considering that Ditka was arrested and convicted of drunken driving in 1985 (for which he had his license suspended six months) after apparantly celebrating a victory over San Francisco on a plane ride home.

Wednesday at Halas Hall in Lake Forest, Ditka was escorted to the taping of another television show in a $220,000 white Rolls-Royce complete with classical music and fresh flowers. Shift of Power

At first, it was easy to dismiss the upside-down standings of the AFC as just a strike-related aftereffect. But apparently there is a real shift of power in the conference, now that Houston, Indianapolis and San Diego are still holding down first place in their respective divisions.

San Diego has to be the biggest surprise because the Chargers play in the toughest conference in the league, the AFC West, which has the conference champion in Denver, a Super Bowl hopeful in Seattle and perennial nasties in the Raiders.

Indianapolis, under Ron Meyer, surged at the end of last season, and can only get better with the addition of Eric Dickerson. Houston's performance is probably the most difficult to explain at this point.

Not counting the strike-marred 1982 season, none of the three division leaders has finished first since San Diego did it in 1980 and 1981. The Colts and Oilers haven't finished first in this decade. The Raiders and Miami, automatic playoff teams for years, could be left in the cold again.

A power shift is less obvious in the NFC, although the Eagles, Vikings and Tampa Bay are looking like bona fide wild-card teams.

"Tampa Bay always has had the talent," Chicago safety Dave Duerson said, "but now with {Ray} Perkins, they've got the coaching, too. That's going to be one tough team and they're not going to take long, either. When we left the field down there last week, some of our guys said, 'See you in the playoffs.' "Troubled Cowboys

Stats of the Week: The Cowboys haven't won a playoff game since 1982, when they beat Tampa Bay and Green Bay to reach the NFC championship game. To find the last time Dallas won a playoff game under real circumstances, you have to go back to 1980, the first season without Roger Staubach . . .

Who has the best record as a starting quarterback -- John Elway, Dan Marino or Jim McMahon? Marino (43-18) has won 70.4 percent, Elway (45-19-1) has won 69.2 percent and McMahon, one additional season but fewer games started because of injuries (38-11), has won 77.5 percent . . .

When the Los Angeles Rams traded two first-round draft choices, a middle-round draft pick and two players to Houston for unsigned draft choice Jim Everett last season, it looked as if the club had solved its seemingly endless quarterback problem. However, Everett has lost his last seven starts and thrown nine touchdowns to 14 interceptions. He completed 49.6 percent of his passes last season, and only 47 percent so far this season. Now without Dickerson, Everett could have even bigger problems. Falcons Difference

It certainly seems to make a lot of sense that the Falcons, so close to making the playoffs last season, fired Dan Henning, and hired defensive coordinator Marion Campbell after about a half-dozen people had turned down the job. The "Swamp Fox" certainly has made a difference. Atlanta's real team has won only one game (a day-before-the-strike upset of the Redskins) and last week got shut out by the Saints. Campbell's job might be on the line except that club owners Rankin Smith Sr. and Jr., referred to as Jed and Jethro by many, might not be able to find anybody willing to take the job in the interim . . . No wonder the Falcons, according to one union representative, were one of only three clubs that wanted to stay out on strike.