Not all teams announce their weekly race chassis'. Here is a list of those teams that do reveal the chassis in the teams race preview:
#2- Brad Keselowski - The No. 2 Miller Lite primary chassis for Michigan is PRS-841 which last raced at Kansas and finished sixth. The backup chassis is PRS-847 which has never raced but has been a backup at several races.
#5- Kasey Kahne - For this weekend at Michigan, No. 5 Farmer's Insurance crew chief Kenny Francis will unload Hendrick Motorsports Chassis No. 5-793. Kahne finished second with this car at Kansas Speedway in April. Most recently, he led 161 laps and drove it to another runner-up finish in May at Charlotte Motor Speedway’s 600-mile race.
#9- Marcos Ambrose - The No. 9 Stanley Ford Fusion team has prepared chassis No. 847 for Michigan. The team competed with this chassis at Texas Motor Speedway where Ambrose started from the fourth position.
#10-Danica Patrick - No. 10 GoDaddy primary chassis No. 10-781 was first used by Patrick in March at Auto Club Speedway in Fontana, Calif., where she started 40th and finished 26th. She then drove this car in April at Kansas Speedway in Kansas City, where she started 25th and finished 25th. The last time this car was used was during the Sprint Showdown on Sprint All-Star Race in May at Charlotte Motor Speedway, where she finished ninth in the Showdown and 10th in the All-Star race
#14-Tony Stewart - Chassis No. 14-735: This week's Bass Pro Shops/Mobil 1 Chevy debuted in the 2012 Brickyard 400 at Indianapolis Motor Speedway where Stewart qualified 28th and rallied to score a top 10 finish. Chassis No. 14-735 made its second career start in October 2012 at Kansas Speedway in Kansas City. It was impressive as Stewart used it to overcome a 33rd place starting spot, a botched pit stop, an incident with Jeff Burton and a lap-166 spin to finish fifth. The car made its third career start in the 2012 season finale at Homestead-Miami Speedway. There, it rallied to a top-20 finish after starting 35th and dealing with handling issues throughout the 267 lap race. Stewart’s milestone 500th career Sprint Cup start also came at Homestead in Chassis No. 14-735. With 2013 Chevrolet SS bodywork covering it, Chassis No. 14-735 returned to action in May for theCoca-Cola 600 at Charlotte Motor Speedway. It rallied again, coming from 25th in the field to lead six laps before finishing seventh, beginning a resurgence for Stewart that has seen him climb eight spots in the championship point standings since Charlotte. This weekend’s Quicken Loans 400 at Michigan will mark the car’s fifth career start and second of 2013.
#15- Clint Bowyer - This week's No. 15 5-hour ENERGY primary chassis, No. 758, finished fifth at Kansas and 35th at Fontana due to a mechanical issue. Backup Chassis No. 724 has not seen action this season.
#16- Greg Biffle - The No. 16 3M /Give Kids a Smile Ford Fusion primary chassis, RK-817, is the same car that Biffle won with in the fall at Michigan last year. Backup Chassis RK-803 last ran Bristol – finished 11th.
#17- Ricky Stenhouse Jr - The No. 17 Zest Ford Fusion primary chassis, RK-814, is the same chassis that the No.17 team ran at Martinsville finishing 25th after getting caught in an accident early in the race. The backup Chassis RK-811 was a chassis that the No. 99 ran numerous times in 2012.
#22- Joey Logano - The Shell Penzoil primary chassis for Michigan is PRS-857 which is a new chassis. The backup chassis is PRS-844 which has never races but has been a backup at several races.
#24- Jeff Gordon - This week's Drive to End Hunger Chevy for Jeff Gordon at Michigan is Hendrick Motorsports chassis No. 24-795. This is a brand new chassis for 2013.
#29- Kevin Harvick - This Week’s Budweiser Chevrolet SS at Michigan International Speedway …Kevin Harvick will pilot chassis No. 378 from the Richard Childress Racing NASCAR Sprint Cup Series stable in the Michigan 400. The California native last piloted this Chevrolet to an 11th-place finish in the NASCAR Sprint All-Star Race at Charlotte Motor Speedway in May.
#31- Jeff Burton - This Weekend’s No. 31 Caterpillar Chevrolet at Michigan International Speedway … Jeff Burton will race chassis No. 372 from the Richard Childress Racing NASCAR Sprint Cup Series stable this weekend at Michigan International Speedway. This No. 31 Chevrolet was utilized earlier this season at Bristol Motor Speedway and Charlotte Motor Speedway in the Coca-Cola 600.
#33- Austin Dillon - This Week’s American Ethanol Chevrolet SS at Michigan International Speedway … Austin Dillon will pilot chassis No. 418 in the Michigan 400 at Michigan International Speedway. This former No. 27 entry was driven by teammate Paul Menard to a 13th-place finish in the Coca-Cola 600 at Charlotte Motor Speedway in May, and a 17th-place finish at Texas Motor Speedway in April before it was converted to the black and green colors of American Ethanol.
#39- Ryan Newman - Ryan Newman will pilot Quicken Loans Chassis No. 39-760 at Michigan International Speedway in Brooklyn in this weekend’s Quicken Loans 400. Built new for 2013, Chassis 39-760 made laps in January at Charlotte Motor Speedway while participating in the final test for NASCAR’s sixth-generation Sprint Cup car. It saw its first laps of racing competition in March at Las Vegas Motor Speedway, where ill handling and an expired engine relegated Newman to a 38th-place finish. Since then, Chassis No. 39-760 was outfitted with aerodynamic updates and was tested last month in a wind tunnel.
#43- Aric Almirola - The No. 43 Eckrich Ford Fusion team has prepared chassis No. 843 for Michigan. Most recently, Almirola drove this chassis to a seventh-place finish at Texas Motor Speedway earlier this season.
#48- Jimmie Johnson - Johnson will drive Lowe's chassis No. 784 at Michigan. No. 784 raced 3 times this year, winning the All Star race and finished 12th at Fontana in March and 3rd at Kansas in April. Chassis No. 720 serves as the backup again this week.
#88- Dale Earnhardt Jr - Dale Earnhardt Jr. will drive a special black and steel-colored No. 88 National Guard “Man of Steel” Chevrolet SS this weekend at Michigan. Crew chief Steve Letarte and the No. 88 crew will unload Hendrick Motorsports Chassis No. 88-716. Earnhardt most recently raced this chassis to a seventh-place finish at the NASCAR Sprint All-Star Race in May. Notably, this is the same chassis Earnhardt drove to Victory Lane in Michigan last June.
#99- Carl Edwards - The No. 99 Fastenal Ford Fusion Blue Team will unload primary chassis RK – 854 this week in Michigan,which is a new chassis for the 2013 season. Backup Chassis: RK – 826 last ran in Texas.
- Reported in Team News/Press Releases