8L45 Clutch Drum 2015, used and ready to install. Fits the 8L45. Ships fast from the USA.
This used GM 8L45 clutch drum, interchange number 334554A, is the aluminum housing for the 1-3-5-6-7 clutch, built with a five-plate friction pack. It fits the smaller of GM's two rear-drive eight-speeds, the one found in the Chevrolet Camaro and Colorado, GMC Canyon and Cadillac ATS, CTS, CT4 and CT6. Buyers usually need it after a teardown turns up a cracked drum or a worn piston bore, or after a Colorado or Camaro that hesitated going into Drive on cold mornings finally stopped pulling in the lower gears.
Like the 8L90, the 8L45 uses five clutches and four planetary sets, holding two or three clutches at once to make each ratio. This pack is applied in first, third, fifth, sixth and seventh, which makes it the busiest clutch in the unit. GM's adaptive learn bulletin 16-NA-019, written for both the 8L45 and 8L90, shows it applying on the 2-3 and 4-5 upshifts, releasing on the 1-2, 3-4 and 7-8 upshifts, and handling the Neutral-to-Drive engagement. GM's service literature lists it as C3; parts catalogs and GEARS Magazine call the drum C1, so search by the gear numbers. Because the 8L45 is built for lighter torque loads than the 8L90, this drum is physically different from the 8L90 part, and the two are not swapped.
GM bulletin 20-NA-187 covers the 2018-2021 Colorado, Canyon and Camaro and 2018-2019 ATS, CTS and CT6, among others. It has you let the vehicle sit 8 to 24 hours, then monitor input speed while shifting into Drive with the brake held; anything past 3 seconds is a fault. GM's first fix is the C3 Drive clutch learn, and only if that fails does it call for inspecting the 1-3-5-6-7 clutch plates and seals. A worn valve body can also crack drums, so read our valve body symptoms guide before replacing hard parts, and our pump failure guide if pressure is low across every gear.
The listing title reads 2015 because the source catalog lists this drum as 2015-up; GM's bulletins show 8L45 vehicles from the 2016 model year. It fits 8L45 units only. GEARS Magazine notes the 1-3-5-6-7 drum was made in four-clutch and five-clutch capacities depending on application and year, identified by a code next to the QR code on top of the drum. This is the five-clutch version, so count the frictions in your old drum and compare the code, or send your year and VIN. The larger unit's part is the 8L90 1-3-5-6-7 clutch drum, and the C4/C5 housing is a separate 8L45 clutch drum listing. Browse the whole family on the 8L90 and 8L45 collection page.
| Fits | 8L45 2015 |
| Part type | Clutch Drum |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
No. The 8L45 and 8L90 use different 1-3-5-6-7 drums. For an 8L90 use our 8L90 clutch drum listing.
Applications include the Chevrolet Camaro and Colorado, GMC Canyon, and Cadillac ATS, CTS, CT4 and CT6. Confirm your RPO code or send us your year and VIN.
The drum is catalogued as 2015-up. GM's 8L45 bulletins start at the 2016 model year, so match the drum code and clutch count rather than the year alone.
This is the five-clutch design. Some 1-3-5-6-7 drums are four-clutch, so count the frictions in your original.
Yes. Run Service Fast Learn, then the Neutral-to-Drive garage-shift learn from GM bulletins 16-NA-019 and 20-NA-187.
